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Prop Clearance Question

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jfs(at)gilanet.com
Guest

Posted: Thu Aug 28, 2008 4:10 pm Post subject: Prop Clearance Question

Good afternoon, Listers,

    I am trying  to/plan to/hoped to fit a 1 Litre Suzuki (turbo) engine

to my 701. It is not  looking good. My current best compromise has the

valve/cam cover 3" above a  "normal" cowl line, and leaves me a 7" prop

clearance with the oil pan about  1" below a "normal" cowl line. I did

not do enough homework before I bought  an SPG-2 (Airtrikes) PSRU

(geared).

    I am not looking  for comments re intelligence and such. I do

solicit opinion about 7" (at  most) of prop clearance. Will I be sorry?



 John F. Schaefer, Sr.   N701NM    (airframe done)

   [quote][b]

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zodierocket(at)hsfx.ca
Guest

Posted: Thu Aug 28, 2008 4:36 pm Post subject: Prop Clearance Question

John, I have flown behind the Geo conversion in a 701 and was impressed, It does not match the Rotax but I believe it to be a reasonable choice. You will be faced with a few decisions in your installation, and though I would prefer to see more prop clearance, especially for grass strips I would not go any less clearance then your 7”. Have a look at http://www.nessaaircraft.net This is Jamie’s building site and a host of information on Geo conversions. I believe his conversion to be the master of conversions on the Geo platform. He does not sell anything or provide parts but he is pretty free on his designs and conversion information.  

   

Mark  

   

--

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billmileski

Joined: 07 Aug 2006
Posts: 68
Location: Ledyard, CT

Posted: Thu Aug 28, 2008 7:06 pm Post subject: Re: Prop Clearance Question

John,

Any chance you are referring to clearance with a prop greater than 67" in diameter?  I am using a Woodcomp Klassic 170cm, which should be 67" in diameter (if their math is correct, I never measured), with good results (912S). It is 3-bladed, and wouldn't know if it's a great fit for your engine, but wondering if this is smaller than what you've got now?



Bill Mileski

Ledyard, CT

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jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Thu Aug 28, 2008 11:33 pm Post subject: Re: Prop Clearance Question

John,

         I just changed my prop from 60" to 64" and my clearance went from 11" to 9".  As I use the 701 in the rough I wouldnt like to get any less.



The European design rules (CAP21 BCAR-S) spell out the minimum for a tricycle at 180 mm (7") statically loaded, with the additional requirement that there be positive clearance if the critical tyre is deflated or that strut is fully compressed on a normal tyre.



So you are basically OK obviously if you run less you will be changing props more often I've seen this happen to a Subaru powered 601 just traversing a shallow ditch head on - wiped out 2 props in 3 months! At the end of the day its probably better to shorten the blades before something solid does - much cheaper. Adding an inch or so to the strut or forks might help.



Ralph

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Ralph - CH701 / 2200a

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