4 blade Idle/Braking (4 blade prop/Zen 120/Webra 145-Greve pip e)

[White, Chris]

I finally tried a 4blade prop on my Zen 120/Webra 145/Greve combo
(10.2lbs)..... Talk about slowing downlines and more constant speed
maneuvering, the only downside I can see is it really cuts into the vertical
performance.  Thanks to all who advised me to try this, alot of windmill
braking on the 4 blade, I could really see it when changing from the APC
16-14 to the 4bl 15-12:)  I need to try a 2 blade 17-10 or 12, but the Zen
has a ground clearance concern.

Chris

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Dean Pappas
Sent: Thursday, December 04, 2003 3:46 PM
To: discussion at nsrca.org
Subject: RE: Idle/Braking (was Re: Winter / Focus / Fuel/Electric.)


Hi Doug,
Sure ... the braking gets better at lower and lower RPM until the combo of
RPM and airspeed stalls the prop airfoils, which are flying "inverted" at
that point.
The braking versus RPM curve at a given airspeed will have a hump. 
Regards,
	Dean

-----Original Message-----
From: Doug Cronkhite [mailto:seefo at san.rr.com]
Sent: Thursday, December 04, 2003 4:39 PM
To: discussion at nsrca.org
Subject: Re: Idle/Braking (was Re: Winter / Focus / Fuel/Electric.)


> I gather that you are saying as far as you can tell, the slower the idle,
> the better the braking? If so,  we are in agreement. The training manual
is
> wrong.

This is correct to a point. As rpm goes lower and lower.. the drag starts 
to go down. 

I know just the guy to ask this stuff about too.. he's an aerodynamicist 
with gulfstream.. and also a Team JR guy.

-Doug

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