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Engine off aerobatics? printer friendly version
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Sam M.
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Posted Friday, October 2, 2009 @ 02:03 AM  

Hello all,
has anyone done engine off aerobatics in there RF? other then rolls?
Collin
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Posted Saturday, October 3, 2009 @ 12:24 PM  

Hi Sam,

With my RF4 all the speeds that you would enter most maneuvers with is also the same speed the prop starts windmilling.

I think with a lightweight feathering propeller, the RF4 would do a nice quite air show routine.

Collin

Jorgen
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Posted Monday, September 6, 2010 @ 05:47 AM  

Hi Guys,
had a very agreeable soaring trip in the 4 yesterday with some altitude to loose before the engine off landing so I did some aeros. Just like Collin says many maneuvres require somewhere around 120 mph, which on XST too is enough to push the prop over the compression. I didn´t find that affected handling more than the distraction it caused on me- each time the prop moves I lost focus for a moment, but maybe that´s just habit. Also, I like it better when the prop stays horisontal when I'm gliding, but as soon as you increase speed the prop wants to go vertical. I agree Collin, wouldn´t a lightweight feathering prop be something? But then again- as René said this summer: : "-Fly four fun- mais pas pour vous ruiner!" (-but don´t go broke...)

Otherwise I think I like engine off aeros better, the wind noise sort of helps check the speed as an audio input so you don't have to glance at the ASI all the time. I tried some inverted gliding too, but with the original cap and in absence of Ray´s "signed, sealed, delivered" fuel cap I couldn´t keep that up (or down) for long with todays price on gas!

May the 4´s be with you/ Jörgen

Sam M.
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Posted Tuesday, September 7, 2010 @ 02:58 AM  

Hey guys, i was able to do prop stopped loops the other day, seems like 125 and mine doesn't move, just barely does a loop from that speed.
Jorgen
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Posted Tuesday, September 7, 2010 @ 05:05 AM  

Cool Sam,
you might be on to something there- with rigorous airspeed control it might be possible to avoid at least some of the prop moves during engine off Aeros.

May the 4´s be with you/ Jörgen

Bob Grimstead
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Posted Tuesday, September 14, 2010 @ 01:06 PM  

Hi Guys,

The propellers I use these days are much more coarse than the original Hoffmann.

An advantage is that the engine windmills back into life at a lower airspeed.

The disadvantage is that the engine windmills back into life at a lower airspeed.

So I've never been able to fly aerobatics with the prop stopped.

However, I can fly a (non-circular) loop at 80 knots.

It's worth experimenting, to see just how slowly you can fly a loop without falling out of it.

You have to tease the stick very gently -- like milking a mouse, and the stall warning light will be illuminated all the way around, but it is very satisfying when you can accomplish a full loop at very low airspeeds.

PS, I'm guessing that Sam has nice, high compressions on his engine, which is why his prop stays stopped?

Yours, Bob

Jorgen
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Posted Tuesday, September 14, 2010 @ 01:34 PM  

Quote:
PS, I'm guessing that Sam has nice, high compressions on his engine, which is why his prop stays stopped?

Bob, I´m more inclined to think it has something to do with the wingload

May the 4´s be with you/ Jörgen

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