Today's Message Index:
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1. 01:29 PM - Re: Ford Crankshaft Choice (taildrags)
2. 02:04 PM - Re: Re: Ford Crankshaft Choice (Glen Schweizer)
3. 02:43 PM - Re: Re: Ford Crankshaft Choice (John C Black)
4. 09:55 PM - Re: Ford Crankshaft Choice (taildrags)
Message 1
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| Subject: | Re: Ford Crankshaft Choice |
John; I'm really surprised that no one has replied to your query about the crank,
since there are quite a number of those engines out there and plenty of hands-on
engine rebuilders too. I know Ernie Moreno up here in Independence is building
up a Ford to put on his Piet to replace the Franklin that he's got on
it now. The extra weight up front will help Ernie's airplane with tail-heaviness.
--------
Oscar Zuniga
Medford, OR
Air Camper NX41CC "Scout"
A75 power, 72x36 Culver prop
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481734#481734
Message 2
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| Subject: | Re: Ford Crankshaft Choice |
Ernies at Oshkosh
> On Jul 18, 2018, at 1:29 PM, taildrags <taildrags@hotmail.com> wrote:
>
>
> John; I'm really surprised that no one has replied to your query about the crank,
since there are quite a number of those engines out there and plenty of hands-on
engine rebuilders too. I know Ernie Moreno up here in Independence is
building up a Ford to put on his Piet to replace the Franklin that he's got on
it now. The extra weight up front will help Ernie's airplane with tail-heaviness.
>
> --------
> Oscar Zuniga
> Medford, OR
> Air Camper NX41CC "Scout"
> A75 power, 72x36 Culver prop
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=481734#481734
>
>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: Ford Crankshaft Choice |
I have heard from 2 guys off list.
I learned that using a 76x44 prop or a 78x42 prop. Model A
engine turns 2100 RPM on takeoff, cruises at 1700-1800 RPM, probably
never exceeds 2200 RPM.
I took my model A Ford car (pic Below) out and ran the engine at
1700-2200 RPM and drove at those RPMs. The Model A engine in the car
has no counterweights on the crank. The engine has been balanced. I did
not experience any harmonic vibration. My rearview mirror amplifies
the vibration and serves as a great observable indicator.
Based on this test, I am leaning toward using the 1932 Model B crank
without counterweights. I figure saving 12-14 pounds is a big deal.
John
On Jul 18, 2018, at 1:29 PM, taildrags <taildrags@hotmail.com> wrote:
<taildrags@hotmail.com>
John; I'm really surprised that no one has replied to your query about
the crank, since there are quite a number of those engines out there and
plenty of hands-on engine rebuilders too. I know Ernie Moreno up here
in Independence is building up a Ford to put on his Piet to replace the
Franklin that he's got on it now. The extra weight up front will help
Ernie's airplane with tail-heaviness.
--------
Oscar Zuniga
Medford, OR
Air Camper NX41CC "Scout"
A75 power, 72x36 Culver prop
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481734#481734
Message 4
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| Subject: | Re: Ford Crankshaft Choice |
John; in the larger scheme of things, saving 12-14 lbs is certainly worth pursuing
since lower gross weight means reduced lift required to climb, and thus reduced
engine thrust to produce the lift. However, many Piets end up tail heavy
and have to shift weight forward somehow, or else shift the wing aft to adjust
the CG. Additional weight up near the prop can help balance the airplane.
It sounds like you're performing your due diligence in making the decision on
which way to go on the crank though.
--------
Oscar Zuniga
Medford, OR
Air Camper NX41CC "Scout"
A75 power, 72x36 Culver prop
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481744#481744
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