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CH701 Usable Fuel

 
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arno7452(at)bellsouth.net
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PostPosted: Fri Oct 05, 2007 11:49 am    Post subject: CH701 Usable Fuel Reply with quote

I am close to finishing my 701. To measure usable fuel, I plan to fill the tanks, drain them thru the regular fuel lines while the plane is sitting on the ground. Seems this should provide reasonable estimate of usable fuel.

I would appreciate any values other 701 flyers are using.

Regards,
Ken Arnold
CH701 N701LK 90%
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n85ae



Joined: 14 Mar 2007
Posts: 403

PostPosted: Fri Oct 05, 2007 11:55 am    Post subject: Re: CH701 Usable Fuel Reply with quote

One thing to consider is the pitch attitude of the plane in a climb/descent,
and make concession for the fuel level other than level flight. You might
find that due to do the pickup location you have a couple gallons less
usable fuel than what you have when level.

Basically, your engine can quit in climb or descent, do to the pickup
being exposed (i.e. gas all at the other end of the tank.).

Regards,
Jeff


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shilcom



Joined: 28 Sep 2007
Posts: 63

PostPosted: Fri Oct 05, 2007 5:27 pm    Post subject: CH701 Usable Fuel Reply with quote

Should consider all expected attitudes, especially steep descent and departure climb. Bob U.
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Terry Phillips



Joined: 11 Jan 2006
Posts: 346
Location: Corvallis, MT

PostPosted: Fri Oct 05, 2007 7:07 pm    Post subject: CH701 Usable Fuel Reply with quote

Ken

I recommend that you consider the approach suggested by John Deakin in Pelican's Perch #7. Basically, he recommends determining the usable fuel in each tank experimentally, while flying a variety of "maneuvers." Unfortunately, the net link that I have for that article

www.warmkessel.com/jr/flying/td/jd/7.jsp

seems to be broken when I just tried it. The article is available in the Google cache. Or, let me know if you would like me to send you a pdf.

Terry


At 03:44 PM 10/5/2007 -0400, you wrote:
Quote:
I am close to finishing my 701. To measure usable fuel, I plan to fill the tanks, drain them thru the regular fuel lines while the plane is sitting on the ground. Seems this should provide reasonable estimate of usable fuel.

I would appreciate any values other 701 flyers are using.

Regards,
Ken Arnold
CH701 N701LK 90%


Terry Phillips
ttp44~at~rkymtn.net
Corvallis MT
601XL/Jab 3300 slow build kit - Rudder done--finally; working on the stab
http://www.mykitlog.com/N47TP/ [quote][b]


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craig(at)craigandjean.com
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PostPosted: Fri Oct 05, 2007 9:01 pm    Post subject: CH701 Usable Fuel Reply with quote

> I recommend that you consider the approach suggested by John Deakin in Pelican's Perch #7.

This link is good but you have to do a (free) registration:

http://www.avweb.com/news/pelican/182044-1.html

-- Craig
[quote][b]


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jetboy



Joined: 22 Jul 2006
Posts: 233

PostPosted: Sat Oct 06, 2007 12:37 am    Post subject: Re: CH701 Usable Fuel Reply with quote

I calibrated my dipstick for 'drainable fuel' so when I dip the tanks I know how much fuel is available in a level flight attitude.

For the CZAW tanks that works out about 40 litres / side with 2.5 litres undrainable - total rating for these tanks was 85 litres.

As with most aircraft, Cessna 150 for example, there must be an additional amount of fuel available to slosh about and still maintain safe flight and the proper term for this may well be 'unuseable fuel'

For the CZAW tanks I rate that amount as 10 litres / side.

I have at times unported a tank with 15 litres when in a steep descent, resulting in power loss of 10 - 30 seconds, so the problem is real. I have not had any problems in level or climbing flight but the drill is to feed off a better tank or both if the level is low.

Ralph


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kmccune



Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA

PostPosted: Sun Oct 07, 2007 12:17 pm    Post subject: Re: CH701 Usable Fuel Reply with quote

Has anyone used a 3rd smaller tank in the fuselage, by plumbing both wing tanks to it and the plumbing this to the engine? It would only take a couple of gallons or less. And if you made the tank tall and narrow and place the outlet on the bottom, then most maneuvers would not effect fuel flow.

Kevin


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jetboy



Joined: 22 Jul 2006
Posts: 233

PostPosted: Mon Oct 08, 2007 1:43 am    Post subject: Re: CH701 Usable Fuel Reply with quote

Thanks kevin,

if I was doing it again I would probably construct an extra tall ZAC gascolator. The drawings call for the gascolator(s) - two for the long range tanks option - to be fabricated from a rectangular section aluminum extrusion with end caps welded top and bottom. Would need to fit the outlet at the normal standoff distance from the drain valve.

Because my aircraft didnt come with the gascolator parts I purchased an ACS one with mesh filter

Ralph


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river1



Joined: 07 Sep 2007
Posts: 28

PostPosted: Mon Oct 08, 2007 2:14 am    Post subject: Re: CH701 Usable Fuel Reply with quote

Kevin ; The early 701 had that option , it was called "D" tank . It was used in Conbination with the then optional wing tanks and allowed space for avionics.
kmccune wrote:
Has anyone used a 3rd smaller tank in the fuselage, by plumbing both wing tanks to it and the plumbing this to the engine? It would only take a couple of gallons or less. And if you made the tank tall and narrow and place the outlet on the bottom, then most maneuvers would not effect fuel flow.

Kevin


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kmccune



Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA

PostPosted: Mon Oct 08, 2007 4:05 am    Post subject: Re: CH701 Usable Fuel Reply with quote

I had heard that they came with a cowl tank, is this the same or did the cowl tank get replaced by wing tanks. Sorry, just trying to get it straight.

Any idea how much the D tank held?
Kevin


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cgbrt(at)mondenet.com
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PostPosted: Mon Oct 08, 2007 4:36 am    Post subject: CH701 Usable Fuel Reply with quote

Kevin.
I installed an 8 litre collector behind the baggage compartment four years
ago. Both wings feed through the collector. It is tall and narrow with a
gascolator on the bottom that drains through the bottom fuselage skin.
A float sensor in the top lights a low fuel warning as soon as the fuel
level starts to go down in the collector giving me a no s--- 30 minute
reserve. I also have a vertical sight gauge with a black cork float to make
it easier to read.
It works well and I can safely burn the wing tanks dry without fuel feed
interruption to the Rotax 912.
Carl
701 on amphibs 476 hrs.
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river1



Joined: 07 Sep 2007
Posts: 28

PostPosted: Mon Oct 08, 2007 4:52 am    Post subject: Re: CH701 Usable Fuel Reply with quote

Hi Kevin ; No it was a separate option when you wanted either more range or space for avionics. I have parts of a 1990 info pack , it doesn't say how many gal the D tank had , maybe zac has option drawings for that .

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arno7452(at)bellsouth.net
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PostPosted: Mon Oct 08, 2007 2:02 pm    Post subject: CH701 Usable Fuel Reply with quote

Thanks for all the good comments. It appears the 701 has a little over 20gal of usable fuel. Installing a "D" tank is more than I want to tackle. It appears to have merit and adds another level of safety.

Another suggestion is to install individual fuel cutoffs on the two tanks. Run one dry and then quickly turn the other on. Not sure if intentionally stopping the engine while airborne is a good idea.

Regards,
Ken Arnold
CH701 N701LK 91%




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kmccune



Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA

PostPosted: Mon Oct 08, 2007 6:05 pm    Post subject: Re: CH701 Usable Fuel Reply with quote

Actually my idea, which apparently is NOT new Wink was to get a bit more range cheaply. The safety factor is just a welcomed by-product.

Hope it all works out well for you.

Kevin


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NYTerminat(at)aol.com
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PostPosted: Mon Oct 08, 2007 6:38 pm    Post subject: CH701 Usable Fuel Reply with quote

I installed a valve at each wing root to be able to shut off each tank. If you have an imbalance you can burn off the higher tank and shut off the lower one. This does not happen often but the real plus of having the valves is when you park at an uneven slope you can prevent the one tank siphoning into the other and then flowing out of the tank vent. I have found this invaluable. I got this suggestion from Gary in Mexico. Thanks Gary, works great!!!!

Bob Spudis
N701ZX CH701/912S/138 hrs



In a message dated 10/8/2007 6:04:22 P.M. Eastern Daylight Time, arno7452(at)bellsouth.net writes:
Quote:
Thanks for all the good comments. It appears the 701 has a little over 20gal of usable fuel. Installing a "D" tank is more than I want to tackle. It appears to have merit and adds another level of safety.

Another suggestion is to install individual fuel cutoffs on the two tanks. Run one dry and then quickly turn the other on. Not sure if intentionally stopping the engine while airborne is a good idea.

Regards,
Ken Arnold
CH701 N701LK 91%







See what's new [quote][b]


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milreed(at)wildblue.net
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PostPosted: Wed Oct 10, 2007 12:20 pm    Post subject: CH701 Usable Fuel Reply with quote

Kevin
Gordon Poer has a small tank behind the seat on the right side of his 701. He runs a 85 HP Continental for power.
When he first flew the craft he did so with gravity feed only from the wing tanks down behind the seat to the floor. During some moderate maneuvers he got an air lock in the line and resultant engine failure. I was just looking at his new setup at the Placerville airport last week.
Now he has a mechanical and electric fuel pumps as well as that small aux tank which is supplied by the right wing tank only. No more fuel problemos !
Mil


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kmccune



Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA

PostPosted: Wed Oct 10, 2007 3:54 pm    Post subject: Re: CH701 Usable Fuel Reply with quote

I like the shut off vale idea, makes take off a little less exciting!

I knew that I needed a fuel pump as the outlet would have to be almost level with the engine. Why doe it feed off of only one of the wing tanks?

I also have learned that the guy with the Hawg-Air site (Hog-Air?) has 14 gallon wing tanks for sale. Now I still like the stock aluminum ones... but they could be larger, say 12 gallons each.

Kevin


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