Today's Message Index:
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1. 05:00 AM - Re: Re: 3.47:1 gear box (John Hauck)
2. 08:44 PM - Re: 3.47:1 gear box (Richard Pike)
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| Subject: | Re: 3.47:1 gear box |
I flew with a 72" WARP Drive Prop on my 912 powered MKIII. Had 3/4" prop to tail
boom clearance. Was not a problem.
I personally do not recommend raising the thrust line. High thrust line in the
pusher configuration is a problem to start with. Increasing thrust line height
increases that problem.
Is there a difference between center of thrust of a 912 and 582 on a MKIII? I
flew with both engines on my MKIII, but cannot remember.
john h
Titus, Alabama
-----Original Message-----
From: owner-kolb-list-server@matronics.com [mailto:owner-kolb-list-server@matronics.com] On Behalf Of Richard Pike
Sent: Thursday, November 26, 2020 9:37 PM
Subject: Kolb-List: Re: 3.47:1 gear box
You guys are great, that is just what I needed to know, thanks.
So now it looks like the only real task is fabricating new taller motor mounts
to fit the 72" prop?
Anybody want to send some pictures of how you did it?
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kolb Firefly Part 103 legal
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=499543#499543
Message 2
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| Subject: | Re: 3.47:1 gear box |
jhauck wrote:
> I flew with a 72" WARP Drive Prop on my 912 powered MKIII. Had 3/4" prop to
tail boom clearance. Was not a problem.
>
> I personally do not recommend raising the thrust line. High thrust line in the
pusher configuration is a problem to start with. Increasing thrust line height
increases that problem.
>
> Is there a difference between center of thrust of a 912 and 582 on a MKIII?
I flew with both engines on my MKIII, but cannot remember.
>
> john h
> Titus, Alabama
> --
Thanks for checking in John, I was planning to try and contact you tomorrow.
For a number of years I have been using a 68" prop with 1.5" of clearance between the prop tips and the boom tube. The motor mounts have 1.5" spacers which you can see in two of the pictures here: http://oh2fly.net/oldpoops/pg2.htm
Obviously I do not want to raise the engine any higher, but going from a 68" to
a 72", the prop blades are 2" longer and I don't see any way around it.
Just went out and measured both the B box and the E box, and each seems to have
3" between the crank centerline and the hub centerline so that would be a constant.
Open to suggestions - thanks.
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kolb Firefly Part 103 legal
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=499555#499555
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