mdnanwelch7(at)hotmail.co Guest
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Posted: Sat Mar 29, 2008 4:55 pm Post subject: Prop clearence on Kolb Mark 111 Xtra |
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Ellery,
Precisely my point. I think most people misunderstood his clearance measurement, AND he should get a prop extension for his Jabiru motor.
Mike Welch
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From: ElleryWeld(at)aol.com
Date: Sat, 29 Mar 2008 20:17:45 -0400
Subject: Re: Re: Prop clearence on Kolb Mark 111 extra
To: kolb-list(at)matronics.com
I understand that Prince P-Tip Propeller is a good match for your application However I think you are going to need more of an extension on your prop to give you more room between the back of your Fuselage Trailing edge of wings and your prop, some of the other guys on this list was explaining they had less clearance than what you have but they was talking about clearance between the prop tip and the Boom tube not the back of there Fuselage Just trying to verify this info correctly for you
Ellery in Maine
do not archive
In a message dated 3/29/2008 12:55:33 P.M. Eastern Standard Time, frankd(at)foundrynet.com writes:
Thanks for the reply's everyone.
The Prince Aircraft prop came with the engine when I got it. It is listed in the Aircraft Spruce Catalogue and has unique drooping tips built in that is designed to enhance performance.. Its a wood core with glass finish and that is why I did not know about flex forward under power.
Just to be clear, the clearance I measured is from the prop tip forward to the fuselage cage. I have seen prop flex on Cessna's when in power run-up but it's minimal. Since I don't have my wings attached yet, I did not even think about clearance from the training edge..
It sounds like there is enough clearance even if the prop does flex some, from your guys experience. I will continue as is.
On a related note, what is the ideal incidence of the engine thrust line in relation to the wing bottom? Should it be the same incidence? I got an engine mount from Titan aircraft to fit the Jabiru to the MkIII Extra and would like to verify incidence before I bolt it all down finally.
Now at the stage of spraying silver on all the fabric so aiming to have it all ready for flight THIS year... thats as close as I will aim for..
Good feedback.. Thanks
f
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