Props, Props and more Props

by Roger Lee in General Tech Discussion 12 years ago

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Re: Props, Props and more Props

by Roger Lee » 12 years ago

Roger Lee

125 5.12k 4.53k

Hi Tony,

If you buy a Warp Drive 3 blade keep it 68" and no nickel edge. The Warp is solid carbon fiber and it can get heavy with the long props. I know a lot of people buy the warp because it tends to be a little cheaper in price. I have a Warp Drive 66" 3 blade for sale with no nicks in it and new leading edge tape. Another nice prop for your setup would be a 68" Sensenich 3 blade. I have learned to appreciate the lighter composite props more now that I see and work on lots of aircraft and gearboxes with heavy props. The Sensenich I tried all seemed to have good climb qualities. A 74" prop for a 912ULS is a really big prop to swing. There is such a thing as too much prop just like there is not having enough prop. For the majority of us the 66" to 70" is more than enough prop and puts the prop in its pitch performance range.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Props, Props and more Props

by Tony Garrett » 12 years ago

Tony Garrett

20 37 11

Roger
Thank you

Tony

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Re: Props, Props and more Props

by William Campbell » 8 years ago

William Campbell

15 25 43

HI Roger,
I have a Warp Drive nickle edge three blade prop on my 2007 80HP Rotax 912UL engine. Occasionally during cold starts and almost always during a hot start the engine and prob start arguing, rattling back and forth with the only recourse being to shut the engine down and try something different to get it started. It just cannot get it spinning up past where the dogs in the non-clutched gear box and the engine rotational torque fight each other.

Do you have any suggestions? Do I need to try a different prop, a slipper clutch installed or what? The engine runs beautifully once it is running but getting to that point can be an embarrassment!

William Campbell

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Re: Props, Props and more Props

by Roger Lee » 8 years ago

Roger Lee

125 5.12k 4.53k

Get the gearbox re-shimmed. Get this done sooner than later or it may be more costly. If you get any kickback don't even try and start the engine until you take care of that issue or you'll trash your starter sprag. If you do that that means pulling the engine.

p.s
Consider getting a lighter composite prop. It will start and stop easier and it absolutely will climb better. This point was proven years ago in a prop research study I did. Cruise speed doesn't really change.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Props, Props and more Props

by Paul Dressendorfer » 8 years ago

Paul Dressendorfer

1 8 0

Hi Roger-

Out of curiosity, did you happen to note whether there was any discernible difference in noise level between the different props? E.g., 3-blade quieter than 2-blade, or shorter blade quieter than longer?

Thanks,

Paul

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