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Jason Omelchuck
Joined: 07 May 2009 Posts: 120 Location: Portland Oregon
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Posted: Sun Jan 31, 2010 2:24 pm Post subject: Re: Alternitive Kolb Engines |
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Hello John,
Yeah, I am looking forward to the day when I can take off for a month and fly. Until that time comes, I need you guys with "more life experience" to keep going to Monument Valley so when I do get the chance to fly down there I can meet everyone. When that day comes, I will have my airplane ready for the the trip because of all these "50 hour" summers.
Best Wishes
Jason
MKIII Yamaha Powered
P.S. How do you get the quote to highlight with the blue box around it when you post a reply on the list?
John Hauck wrote: | > Last summer I put about 40 hours on the Yamaha engine and I am enjoying
its performance very much. I have not had to add any oil and I get a cruise
of about 70mph. at about 5.5 gal/hr. Take off and climb is very brisk even
at a gross weight of 1150lbs. This winter the airplane has been down for
new landing gear and adding EGT and installing a better radio. I would love
to fly some long X counties but with 2 weeks of vacation a year and 2 kids
with soccer and such it is very hard to take even a full week off just to
fly. By the end of this summer I hope to have about a hundred hours on the
engine and I will update the progress.
Quote: |
Jason
MKIII, Yamaha powered
Portland OR
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Jason/Gang:
I like your Yamaha. Aren't you running a redrive/gearbox?
I've been spoiled when it comes to time off to go fly. I have been retired
from the Army for 30 years today. Became single not long before retirement.
Learned to live on my Army retirement, which wasn't much in 1980. I had to
sacrifice a lot of things to be able to do what I have been able to do.
Sometimes I forget everybody can not take off on a weekend and take a chance
of not getting back in time to go to work Monday morning, or have wives and
children that have mandatory activities that need Mom and Dad's presence and
time.
The one thing I have had is time. At 70 I have discovered how valuable it
is. Can't buy it and can't get more than the good Lord provides for us. Do
what you want to do before you get too old to do it or lose the desire to do
it. I have already reached the primary stages of that part of my life. I
still have dreams and still get out there and pump adrenalin, but not like I
did 5 years ago.
john h
mkIII |
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John Hauck

Joined: 09 Jan 2006 Posts: 4639 Location: Titus, Alabama (hauck's holler)
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Posted: Sun Jan 31, 2010 2:47 pm Post subject: Alternitive Kolb Engines |
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> Jason
Quote: | MKIII Yamaha Powered
P.S. How do you get the quote to highlight with the blue box around it
when you post a reply on the list?
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Jason/Gang:
I am old fashioned. Comes with old age, errrr maturity. I still use the
email list and make my own quotes.
I hope after us senior citizens get to old to make the flight, you young
bucks will continue to carry the banner and keep The Unplanned/Unorganized
Kolb Flyin, Monument Valley, utah, alive and well. It has been a great
source for making new friends and renewing old friendships, learning about
our airplanes, and having a lot of fun in an extremely relaxed atmosphere.
john hauck
mkIII
Titus, Alabama
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_________________ John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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elleryweld(at)aol.com Guest
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Posted: Sun Jan 31, 2010 3:08 pm Post subject: Alternitive Kolb Engines |
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The 912ULS made a considerable difference in performance. There was a lot more difference between the two engines than a noisy prop.
now your Talking a 2200 Jabaru engine 85 HP against the 912 ULS 100 HP there is 15 HP difference the 912 ULS I would expect to out preform the 2200 Jab with only 85Hp
Ellery Batchelder Jr.
--
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John Hauck

Joined: 09 Jan 2006 Posts: 4639 Location: Titus, Alabama (hauck's holler)
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Posted: Sun Jan 31, 2010 4:27 pm Post subject: Alternitive Kolb Engines |
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Ellery B/Gang:
Although the 912ULS is a 100 hp engine, without an inflight adjustable prop, we only see 95 hp at 5500 rpm. It is rated for continuous duty at 5500 rpm. The engine is limited to 5 minutes at 5800 rpm which produces 100 hp. I've never flown a 912ULS that was producing 100 hp except the Kolb Sport which had a constant speed prop and would let you turn 5800. Of course, that airplane did not perform anything like the a "real" Kolb.
The big difference is being able to turn a big prop at the optimum rpm and getting that bugger hooked up.
john hauck
mkIII
Titus, Alabama
[quote]
The 912ULS made a considerable difference in performance.
now your Talking a 2200 Jabaru engine 85 HP against the 912 ULS 100 HP there is 15 HP difference the 912 ULS I would expect to out preform the 2200 Jab with only 85Hp
Ellery Batchelder Jr.
[b]
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_________________ John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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rickofudall

Joined: 19 Sep 2009 Posts: 1392 Location: Udall, KS, USA
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Posted: Sun Jan 31, 2010 4:48 pm Post subject: Alternitive Kolb Engines |
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John, Take heart. My friend Ralph Senter celebrated his 80th last summer with a four hour flight in his hang glider. He has wheels on the control bar so he doesn't risk breaking something on landing and he was pretty sore for a week but he's still at it after over 30 years.
Rick Girard
On Sun, Jan 31, 2010 at 6:22 PM, John Hauck <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)> wrote:
[quote] Ellery B/Gang:
Although the 912ULS is a 100 hp engine, without an inflight adjustable prop, we only see 95 hp at 5500 rpm. It is rated for continuous duty at 5500 rpm. The engine is limited to 5 minutes at 5800 rpm which produces 100 hp. I've never flown a 912ULS that was producing 100 hp except the Kolb Sport which had a constant speed prop and would let you turn 5800. Of course, that airplane did not perform anything like the a "real" Kolb.
The big difference is being able to turn a big prop at the optimum rpm and getting that bugger hooked up.
john hauck
mkIII
Titus, Alabama
Quote: |
The 912ULS made a considerable difference in performance.
now your Talking a 2200 Jabaru engine 85 HP against the 912 ULS 100 HP there is 15 HP difference the 912 ULS I would expect to out preform the 2200 Jab with only 85Hp
Ellery Batchelder Jr.
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John Hauck

Joined: 09 Jan 2006 Posts: 4639 Location: Titus, Alabama (hauck's holler)
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Posted: Sun Jan 31, 2010 5:09 pm Post subject: Alternitive Kolb Engines |
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Rick G/Gang:
My hat is off to him.
I hope I can still do it when I am his age.
john hauck
MKIII
Titus, Alabama
[quote]
John, Take heart. My friend Ralph Senter celebrated his 80th last summer with a four hour flight in his hang glider. He has wheels on the control bar so he doesn't risk breaking something on landing and he was pretty sore for a week but he's still at it after over 30 years.
Rick Girard
[b]
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_________________ John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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lucien
Joined: 03 Jun 2007 Posts: 721 Location: santa fe, NM
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Posted: Sun Jan 31, 2010 5:10 pm Post subject: Re: Alternitive Kolb Engines |
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rickofudall wrote: | Lucien, Before you get a Rice King clutch see if you can get a flight in an airplane that has one in the gearbox. Pull power and see what happens to the glide. I pulled mine out as soon as I got the parts to replace it. Great if you're pushing a rice boat, horrible in an aircraft.
Rick Girard
do not archive
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My FS II had the RK-400 clutch fitted to it by the original builder; I kept it when I replaced the engine and flew it a little over 100 hours or so with the clutch.
I'll never run the C box without an RK-400 clutch installed ever again - it solves so many more problems than it introduces (the windmilling prop problem which, in my experience with my FS II was not really much of a problem) that it's hard for me to imagine life with a 503/C box without a clutch.....
I still have my old C box and clutch with spare set of shoes out at the hangar; keeping it in case I go with another FS II.....
LS
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_________________ LS
Titan II SS |
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HShack(at)aol.com Guest
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Posted: Sun Jan 31, 2010 6:12 pm Post subject: Alternitive Kolb Engines |
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Would you like to get rid of that dangerous piece of junk?
In a message dated 1/31/2010 8:16:00 P.M. Eastern Standard Time, lstavenhagen(at)hotmail.com writes:
Quote: | Before you get a Rice King clutch see if you can get a flight in an airplane that has one in the gearbox. Pull power and see what happens to the glide. I pulled mine out as soon as I got the parts to replace it. Great if you're pushing a rice boat, horrible in an aircraft |
do not archive
[quote][b]
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Richard Pike

Joined: 09 Jan 2006 Posts: 1671 Location: Blountville, Tennessee
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Posted: Sun Jan 31, 2010 6:41 pm Post subject: Re: Alternitive Kolb Engines |
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[quote="Dana"]At 01:28 PM 1/31/2010, Jason Omelchuck wrote:
Quote: | Using your logic consider:
It is an established fact,VG's grossly improve performance
on Kolb aircraft, no matter what model it is. |
Oh no! Somebody mention Seafoam, quick!
-Dana
[quote]
Took this at RVN during today's EAA meeting - Cessna has improved on VG's, they are using the SLED instead. (Snow Leading Edge Device)
This SLED equipped but otherwise humble 152 will kick all yur wimpy VG equipped tails and then fly off into the sunset gloating.
Video at eleven.
Richard Pike
MKIII N420P (420ldPoops)
do not archive
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Jason Omelchuck
Joined: 07 May 2009 Posts: 120 Location: Portland Oregon
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Posted: Mon Feb 01, 2010 8:24 am Post subject: Re: Alternitive Kolb Engines |
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I have an RK 400 clutch in my MKIII and it works well. At minimum approach speeds, I do not believe I loose very much glide at all.
My .02 worth
Jason
[quote="rickofudall"]Lucien, Before you get a Rice King clutch see if you can get a flight in an airplane that has one in the gearbox. Pull power and see what happens to the glide. I pulled mine out as soon as I got the parts to replace it. Great if you're pushing a rice boat, horrible in an aircraft.
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NeilsenRM(at)comcast.net Guest
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Posted: Mon Feb 01, 2010 9:20 am Post subject: Alternitive Kolb Engines |
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Jason
It seems like you posted photos or your engine a while back but could you
post them again. What Yamaha engine (motor cycle?) are you using? Are you
using a Rotax reduction drive? Did you make the redrive adapter? What was
involved? Your fuel burn seems high for your speeds? Is it a high HP engine?
What prop and reduction ratio are you running? What RPM do you turn at your
stated 70 MPH cruse? Water cooled?
Sorry for all the questions. Again I like alternative engines and this one
sounds promising.
Rick Neilsen
Redrive VW Powered MKIIIC
---
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rickofudall

Joined: 19 Sep 2009 Posts: 1392 Location: Udall, KS, USA
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Posted: Mon Feb 01, 2010 9:31 am Post subject: Alternitive Kolb Engines |
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As best as I was able to measure the Rice King cut the glide of my Mk III to a bit less than 2.5 to 1. This is with a Warp Drive 3 blade with untapered blades. Even with the engine stopped and all other things the same, the glide is a bit over 6 to 1. The only advantage I ever saw was the engine didn't engage the clutch until 2500 RPM and it was real smooth then. Stock at 2500 RPM there's no differrence. At lower RPM no comparison can be made for obvious reasons. The only real difference that matters to me is that I made the field when my engine quit last August. I wouldn't have if I'd still had the Rice King.
Rick Girard
On Mon, Feb 1, 2010 at 10:24 AM, Jason Omelchuck <jason(at)trek-tech.com (jason(at)trek-tech.com)> wrote:
[quote] --> Kolb-List message posted by: "Jason Omelchuck" <jason(at)trek-tech.com (jason(at)trek-tech.com)>
I have an RK 400 clutch in my MKIII and it works well. At minimum approach speeds, I do not believe I loose very much glide at all.
My .02 worth
Jason
[quote="rickofudall"]Lucien, Before you get a Rice King clutch see if you can get a flight in an airplane that has one in the gearbox. Pull power and see what happens to the glide. I pulled mine out as soon as I got the parts to replace it. Great if you're pushing a rice boat, horrible in an aircraft.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=284374#284374
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John Hauck

Joined: 09 Jan 2006 Posts: 4639 Location: Titus, Alabama (hauck's holler)
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Posted: Mon Feb 01, 2010 10:37 am Post subject: Alternitive Kolb Engines |
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Gang:
Rotax, back in my two stroke days, instructed us to keep the engine rpm at or above 2000 rpm as soon as we cranked. This got us out of gear box chatter and idled smoothly. Did not matter which engine it was or gear box. I have watched people crank two strokes, let them idle at low rpm, and beat themselves silly until the pilot increased rpm.
If someone is having a serious problem with gearbox chatter in a C gearbox, they might want to insure the rubber hardy disk is serviceable and the correct density. When I got my new 582 in 1991, it was shipped with a hard disk that was too soft. Try as I would, during its initial startup I could not get the engine above idle. I was fit to be tied. Got Eric Tucker on the phone. He knew what it was and send me the correct hardy disk overnight. That fixed the problem.
Might be a matter of pilot technique to be aware of and understand what the gearbox and engine are trying to tell you, especially when it is trying to turn a large diameter, heavy prop.
I'll trade additional glide for a little momentary engine idle roughness any day.
You all correct me if I am wrong, the only advantage of this piece of equipment is smooth out idle by preventing gear box chatter (back lash)(torsional vibration).
Too bad the clutch does not have a prop brake so the pilot could control the amount of drag the windmilling prop produces. Would make a super air brake. Prop makes a heck of an air brake when it is autorotating. Remember, this is what makes a gyrocopter fly.
I would not fly with one.
john hauck
mkIII
titus, alabama
Quote: |
The only advantage I ever saw was the engine didn't engage the clutch until 2500 RPM and it was real smooth then. Stock at 2500 RPM there's no differrence.
Rick Girard
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_________________ John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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lucien
Joined: 03 Jun 2007 Posts: 721 Location: santa fe, NM
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Posted: Mon Feb 01, 2010 10:47 am Post subject: Re: Alternitive Kolb Engines |
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rickofudall wrote: | As best as I was able to measure the Rice King cut the glide of my Mk III to a bit less than 2.5 to 1. This is with a Warp Drive 3 blade with untapered blades. Even with the engine stopped and all other things the same, the glide is a bit over 6 to 1. The only advantage I ever saw was the engine didn't engage the clutch until 2500 RPM and it was real smooth then. Stock at 2500 RPM there's no differrence. At lower RPM no comparison can be made for obvious reasons.� The only real difference that matters to me is that I made the field when my engine quit last August. I wouldn't have if I'd still had the Rice King.
Rick Girard
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I vaguely remember years ago my CFI telling me that, if you actually did the math on it, a windmilling prop comes out having approximately the same drag as a metal disk of the same diameter.....
My FSII didn't have a 2.5:1 glide ratio but it was definitely steeper than another FS II that lived at a nearby airport that didn't use a clutch. Turned out to be very useful in my FSII, a poor-man's speed brake/flaps for when I was too high or otherwise needed to come down Right Now. Just pull back to idle and it was like a max-effort slip
LS
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Thom Riddle

Joined: 10 Jan 2006 Posts: 1597 Location: Buffalo, NY, USA (9G0)
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Posted: Mon Feb 01, 2010 11:05 am Post subject: Re: Alternitive Kolb Engines |
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....You all correct me if I am wrong, the only advantage of this piece of equipment is smooth out idle by preventing gear box chatter (back lash)(torsional vibration).....
I've never had a clutched prop but can think of another advantage of one. At idle speed the prop is not turning so it can't hurt you or others nearby or stray dogs who should not be allowed loose on an airport, or somnambulists who are inclined to walk into killer props. Not saying this advantage is worth the $cost or disadvantages. That judgement is up to the owner, of course.
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_________________ Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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lucien
Joined: 03 Jun 2007 Posts: 721 Location: santa fe, NM
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Posted: Mon Feb 01, 2010 11:16 am Post subject: Re: Alternitive Kolb Engines |
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Thom Riddle wrote: | ....You all correct me if I am wrong, the only advantage of this piece of equipment is smooth out idle by preventing gear box chatter (back lash)(torsional vibration).....
I've never had a clutched prop but can think of another advantage of one. At idle speed the prop is not turning so it can't hurt you or others nearby or stray dogs who should not be allowed loose on an airport, or somnambulists who are inclined to walk into killer props. Not saying this advantage is worth the $cost or disadvantages. That judgement is up to the owner, of course. |
The advantages of the clutch include:
- vastly easier starting. With the prop disengaged from the crank, you're pretty much just pulling on a snomobile engine. No more need for that expensive, heavy electric start. Pulling the rope is no longer like weight training for the Mr. America contest.
- completely eliminates the descent with partial throttle opening difficulty with the 2-strokes. Pull back to idle and you can dive to your heart's content without endangering the engine.
- allows completely realistic engine-out practice without actually having to shut the engine down. At idle, the conditions are _identical_ to those you'll encounter with the engine actually off. Allows you to practice real engine-out landings with the engine still running, a big safety advantage for emergency procedures training.
- windmilling prop adds drag, loads of it. A big help for planes like the FS II that don't have flaps and where slips aren't terribly effective. An extra tool available for use for managing your approach.
- idling is much easier on the crankshaft without the prop hooked up to it. You can set the idle to 1700 rpm (bottom out the slides in the carburettors) which it'll do nicely with hammering of the box or crank.
- stopped prop on flightline is a real novelty.
Those are the main advantages. Again, a huge step up in terms of problems solved, more than makes up for the small problems it introduces....
LS
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Titan II SS |
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John Hauck

Joined: 09 Jan 2006 Posts: 4639 Location: Titus, Alabama (hauck's holler)
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Posted: Mon Feb 01, 2010 12:33 pm Post subject: Alternitive Kolb Engines |
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> The advantages of the clutch include:
Quote: |
- vastly easier starting. With the prop disengaged from the crank, you're
pretty much just pulling on a snomobile engine. No more need for that
expensive, heavy electric start. Pulling the rope is no longer like weight
training for the Mr. America contest.
- completely eliminates the descent with partial throttle opening
difficulty with the 2-strokes. Pull back to idle and you can dive to your
heart's content without endangering the engine.
- windmilling prop adds drag, loads of it. A big help for planes like the
FS II that don't have flaps and where slips aren't terribly effective. An
extra tool available for use for managing your approach.
- idling is much easier on the crankshaft without the prop hooked up to
it. You can set the idle to 1700 rpm (bottom out the slides in the
carburettors) which it'll do nicely with hammering of the box or crank.
- stopped prop on flightline is a real novelty.
Those are the main advantages. Again, a huge step up in terms of problems
solved, more than makes up for the small problems it introduces....
LS
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I wouldn't make an engine out forced landing with a drag chute that I could
not release.
Scrubbing landing speed has never been a problem in a Kolb. Increasing
glide always has been.
john hauck
mkIII
Titus, Alabama
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MKIII/912ULS
hauck's holler
Titus, Alabama |
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rickofudall

Joined: 19 Sep 2009 Posts: 1392 Location: Udall, KS, USA
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Posted: Mon Feb 01, 2010 12:35 pm Post subject: Alternitive Kolb Engines |
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Yep, lots of advantages, right up to the point you don't make that big open landing field and roll your plane in a ball. :-{
Rick Girard
On Mon, Feb 1, 2010 at 1:17 PM, lucien <lstavenhagen(at)hotmail.com (lstavenhagen(at)hotmail.com)> wrote:
[quote]--> Kolb-List message posted by: "lucien" <lstavenhagen(at)hotmail.com (lstavenhagen(at)hotmail.com)>
Thom Riddle wrote:
> ....You all correct me if I am wrong, the only advantage of this piece of equipment is smooth out idle by preventing gear box chatter (back lash)(torsional vibration).....
>
> I've never had a clutched prop but can think of another advantage of one. At idle speed the prop is not turning so it can't hurt you or others nearby or stray dogs who should not be allowed loose on an airport, or somnambulists who are inclined to walk into killer props. Not saying this advantage is worth the $cost or disadvantages. That judgement is up to the owner, of course.
The advantages of the clutch include:
- vastly easier starting. With the prop disengaged from the crank, you're pretty much just pulling on a snomobile engine. No more need for that expensive, heavy electric start. Pulling the rope is no longer like weight training for the Mr. America contest.
- completely eliminates the descent with partial throttle opening difficulty with the 2-strokes. Pull back to idle and you can dive to your heart's content without endangering the engine.
- windmilling prop adds drag, loads of it. A big help for planes like the FS II that don't have flaps and where slips aren't terribly effective. An extra tool available for use for managing your approach.
- idling is much easier on the crankshaft without the prop hooked up to it. You can set the idle to 1700 rpm (bottom out the slides in the carburettors) which it'll do nicely with hammering of the box or crank.
- stopped prop on flightline is a real novelty.
Those are the main advantages. Again, a huge step up in terms of problems solved, more than makes up for the small problems it introduces....
LS
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LS
Titan II SS
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rlaird

Joined: 10 Jan 2006 Posts: 373 Location: Houston
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Posted: Mon Feb 01, 2010 12:46 pm Post subject: Alternitive Kolb Engines |
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They are also desirable for float-/sea-planes.... when maneuvering a docking, the pilot will have more control over when there is and isn't thrust coming from the prop.
On Mon, Feb 1, 2010 at 1:05 PM, Thom Riddle <riddletr(at)gmail.com (riddletr(at)gmail.com)> wrote:
[quote]--> Kolb-List message posted by: "Thom Riddle" <riddletr(at)gmail.com (riddletr(at)gmail.com)>
...You all correct me if I am wrong, the only advantage of this piece of equipment is smooth out idle by preventing gear box chatter (back lash)(torsional vibration).....
I've never had a clutched prop but can think of another advantage of one. At idle speed the prop is not turning so it can't hurt you or others nearby or stray dogs who should not be allowed loose on an airport, or somnambulists who are inclined to walk into killer props. Not saying this advantage is worth the $cost or disadvantages. That judgement is up to the owner, of course.
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Thom Riddle
Buffalo, NY
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x31
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Robert Laird
formerly: MkIIIc w/ 912ULS & Gyrobee
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lucien
Joined: 03 Jun 2007 Posts: 721 Location: santa fe, NM
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Posted: Mon Feb 01, 2010 1:11 pm Post subject: Re: Alternitive Kolb Engines |
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John Hauck wrote: | >
I wouldn't make an engine out forced landing with a drag chute that I could
not release.
Scrubbing landing speed has never been a problem in a Kolb. Increasing
glide always has been.
john hauck
mkIII
Titus, Alabama |
True, but my point being that you can practice exactly the engine-off glide you do get without actually having to shut the engine down.
This is a very large safety advantage when practicing emergency procedures. If you really really really _do_ screw up your approach during practice, you're not screwed and calling Travis the next day for parts etc if you can't restart in time.
Without it, the only way to truly simulate an engine-off situation is to actually shut er down.
It was probably that alone that made the clutch's 400+ price tag worth it with my FS II. In my experience, being as familiar as possible with the glide ratio of the plane engine-off edges out a moderately increased glide ratio - I could (and did, over and over) practice completely realistic engine-off glides without having to actually shut down. Made the practice safer, funner and I did it more often.....
LS
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