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Old 02-10-2014, 01:26 PM   #1
dwdl21
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Right thrust?


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A shot in the dark but here goes...lol I have an old Midwest Success series Me 109 .40, flew great until I lost it in a grey sky and nose dived it in, thank goodness for grass...lol No problem rebuilding but the plans have no top view so I have no idea if it had right thrust, any chance some one out there knows?
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Old 02-10-2014, 07:50 PM   #2
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Re: Right thrust?

Most planes have a few deg right thrust and a few down thrust. The down thrust eases severe pitch changes with changes in power.

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Old 02-11-2014, 08:43 AM   #3
kip51035
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Re: Right thrust?

Mark the inside of the fuselage exactly the same distance from the center of the rudder post, then on the right side put another mark 3/16" back from that. If it is a wide fuselage make it 1/4". Use these two marks to put a slight angle on the firewall. In order to have the engine thrust washer in the center of the fuselage you will have to move the back of the engine to the left. On my normal .60 size aircraft I mark the firewall position exactly in the same position on both sides and line the back of the left side with the mark and on the right side the front of the firewall lines up with the mark and I move the back of the engine over 1/4" to the left. So that is 1/4" and 1/4". The other way for the engine offset is put the firewall on the table with a piece of 1/4" under the left side, put the engine with the mount on the firewall and use a 90 deg. square to check if the thrust washer is in center. Shim the left side to get the desired results. Mark it down so you will be able to remember the exact distance the left side needs to be moved forwards.
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Old 02-11-2014, 09:18 AM   #4
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Re: Right thrust?

Thanks Kip, your post just reminded me of something, I do believe the engine mount was centered on the fire wall, which now has me thinking there was no right thrust at all, would this account for the large amount of right rudder on take off? I know tail draggers need some right rudder on take off but this thing needed allot.
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Old 02-11-2014, 10:34 AM   #5
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Re: Right thrust?

Quote:
Originally Posted by dwdl21 View Post
Thanks Kip, your post just reminded me of something, I do believe the engine mount was centered on the fire wall, which now has me thinking there was no right thrust at all, would this account for the large amount of right rudder on take off? I know tail draggers need some right rudder on take off but this thing needed allot.
Thanks
Dwayne
Yes, not having right thrust will mean you will be needing a lot of rudder to keep it straight as it accelerates. Especially while the tail is down.(Greater P Factor)
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Old 02-11-2014, 06:47 PM   #6
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Re: Right thrust?

To check for the right amount of thrust offset fly the aircraft straight away from you with the wings level and pull the aircraft straight up under power. Then adjust the rudder trim so the aircraft goes straight up. When you have accomplished this the next one when you pull it straight up chop the throttle and notice which way it falls. If it goes the same direction every time then you will know which way to adjust the thrust line to correct this
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