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vince(at)devonwindmills.c
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 Posted: Tue Apr 20, 2010 4:24 am Post subject: RotaxEngines-List Digest: 9 Msgs - 04/19/10 |
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My experience of declutched freewheeling propellers is that in event
of engine off, glide distance is significantly reduced, perhaps worse
than half.
This in turn cuts reachable landing spots to a quarter as well as
reducing time available. Yes you can use it intentionally like a
spoiler or flap, but you cant "reduce flap" to penetrate ahead.
Also the disturbed airflow over the tail can give you a nasty surprise
whe you try to do an accurate landing flare
Vince Hallam
Torquay, Devon, TQ1 3LZ
www.devonwindmills.co.uk
On Tue, Apr 20, 2010 at 7:58 AM, RotaxEngines-List Digest Server
<rotaxengines-list(at)matronics.com> wrote:
[quote] *
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RotaxEngines-List Digest Archive
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Total Messages Posted Mon 04/19/10: 9
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Today's Message Index:
----------------------
1. 08:37 AM - Re: Fuel consumption for the 912S (John Goodings)
2. 09:06 AM - Re: Re: Why exactly shouldn't you run a 914 without a prop? (Noel Loveys)
3. 09:08 AM - Re: Re: Why exactly shouldn't you run a 914 without a prop? (Gilles Thesee)
4. 09:14 AM - Re: Re: Fuel consumption for the 912S (Gilles Thesee)
5. 11:34 AM - Re: Why exactly shouldn't you run a 914 without a prop? (rparigoris)
6. 01:29 PM - Re: Why exactly shouldn't you run a 914 without a prop? (rparigoris)
7. 03:15 PM - Re: 912s motor mount question (Guy Buchanan)
8. 03:52 PM - Re: Why exactly shouldn't you run a 914 without a prop? (lucien)
9. 07:06 PM - Desser 4.00-6 8 ply and 6 ply LSA tire (Roger Lee)
________________________________ Message 1 _____________________________________
Time: 08:37:05 AM PST US
From: John Goodings <goodings(at)yorku.ca>
Subject: Re: Fuel consumption for the 912S
People have been quoting fuel consumption figures for the Rotax 914
recently. The figures quoted seem rather high. What fuel consumption do
people get with the Rotax 912S (100 HP)? We have measured it pretty
carefully over quite a number of hours, and we are getting slightly under
16 litres/hr (4.34 U.S. gal/hr) at 5200 RPM cruise. We use mainly 91
octane mogas without ethanol additive, but probably 1/3 of the fuel used
is 100 LL because we don't have a choice at many small airports in
Ontario. Here are other details of our aircraft, but I'm not sure they
are very relevant to fuel consumption. Our aircraft is a CH601HD with a
66-inch, 3-blade, GSC prop flying with 2 people (and 1 small Italian
greyhound!) near 1200 lbs gross weight. Because of that thick wing, our
cruise is only about 100-105 mph.
John Goodings, C-FGPJ, CH601HD with R912S, Carp/Ottawa/Toronto.
________________________________ Message 2 _____________________________________
Time: 09:06:03 AM PST US
From: "Noel Loveys" <noelloveys(at)yahoo.ca>
Subject: RE: Re: Why exactly shouldn't you run a 914 without
a prop?
Lucien:
Dave has a video up on you tube where he hand props a 582 in the middle of
winter up to his backside in snow. While rotax has good pull cord starters
they have to come off to put on the standard electric starter. Being able
to hand prop a plane can be literally a life saver on a cold Ontario day.
Noel
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Tue Apr 20, 2010 4:56 am Post subject: Re: RotaxEngines-List Digest: 9 Msgs - 04/19/10 |
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| vince(at)devonwindmills.c wrote: | My experience of declutched freewheeling propellers is that in event
of engine off, glide distance is significantly reduced, perhaps worse
than half.
This in turn cuts reachable landing spots to a quarter as well as
reducing time available. Yes you can use it intentionally like a
spoiler or flap, but you cant "reduce flap" to penetrate ahead.
Also the disturbed airflow over the tail can give you a nasty surprise
whe you try to do an accurate landing flare
Vince Hallam
Torquay, Devon, TQ1 3LZ
www.devonwindmills.co.uk
|
Er....,
With my clutch equipped FSII I noticed neither of these problems. Compared to another FSII that ran a 66" TPI on a 503 B box (no clutch), my glide ratio engine-off was noticeably less than his when engine-off, but nowhere near worse by half.
Also, I never noticed any disturbed airflow over the tail due to the freewheeling prop. Rudder and elevator control was nominal at all times.
At engine-idle, it glided like a Kolb with no troubles or wierdness at all.
The drag effect could be more on a front engined tractor where the prop is unobstructed, tho. But on my Kolb, it was a non-event.
LS
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LS
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