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C of G on an Irving 40 trainer

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Clive Moore30/04/2007 20:15:00
150 forum posts
28 photos
Hi all, I have an Irvine 40 trainer with a OS 46AX. I do not have the instructions for the model as I purchased it as used.

I need to know where the C of G point is and also how much side thrust the engine should have (as it has moved on its mount)?

Any one got ant ideas?
Jonathan Lewzey01/05/2007 11:10:00
1136 forum posts
683 photos
As soon as I find the manual for my my, I will post the C of G position (if someone hasn't already.) Our one had an OS46LA and the side thrust was about 1 to 2 degrees. However, I don't believe the manual includes info on this and I'm not sure it's vital
Clive Moore01/05/2007 13:06:00
150 forum posts
28 photos
Thankyou Jonathan, I havent recieved any other responses so your info would be much appreciated.
Stevo01/05/2007 13:30:00
2699 forum posts
419 photos
Not sure about the Irvine trainer but my Ripmax Trainer 40 has no side/downthrust and the CG is 80mm from the Leading edge. It runs an Irvine 40 on contest 10 fuel and has an unbeleivably great idle!
Dave M02/05/2007 14:30:00
170 forum posts
3 photos
Clive, the instruction book for the tutor 40 says "Tighten the bolt equally so that the clamp plates are kept square to the engine and that the engine is in straight".

The Cof G, (balance point) s shown as 85mm back from the leading edge of the wing.

I hope that this helps

Jonathan Lewzey02/05/2007 16:00:00
1136 forum posts
683 photos
sorry, i've only just found my instructions. Although the manual says to have the engine straight, it is critical you have no left thrust even if you don't need any right.
Clive Moore02/05/2007 20:03:00
150 forum posts
28 photos
thanks to all. I have now got it sorted.


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