ok im putting a new motor on my laser 200 i had a quadra q52 on it but upgraiding to a dm55 (made my the ex engneer of the da line of motors) i made my own stand off for my uadra inwitch made it easy to set up the right hand and down thrust but with this new motor it has stand off i need to know how many washers it takesper 1 degree and how much down and right i should take it to ATM i have 2 degree down and 1 right with my quadra but i know every motor is differnet

What are the horizontal and vertical dimensions between the centers of the holes?

As Lnewqban said, use your trig functions, i.e. the tangent function. Your calculator function on your computer will give you the angle.

A different question.

My 30yr old/ new 1/4 scale Bud Nosen cub ran down the field with tail off ground but would not take off.

Do I have:

1. Too much donw thrust on engine?
2. Nose heavy?
3. Or should I just trim the elevator with some "down"?

Thanks for any healp

Rafeek

Not sure this will answer your questions but: on my 1/4 scale Cub, it liked a CG set at about 30% of chord. Some will say that is to far forward but it worked for me. You will need about 5 degrees downthrust and 3 to 5 degrees right thrust for easy trim. If you decalage (difference between the wings angle of attack and the elevator angle of attack) is per plans, it should lift of fine with just a touch of up elevator after it gains flying speed on the ground. If you have trouble taking off, it may be because you have the main landing gear to far forward, if per plans it should be okay.

Thanks Rodney,
Mine is balanced at 25% from LE,I can easily take off some weight from the front as I moved the engine forward with spacers to do that.
Not sure if I can get inanother flight before oldman winter sets in as the winds are unpredictable but will try, thanks
What kit is yours? What engine do you have?

I am using a OS FT-120 Gemini engine (4 stroke) which leaves slightly underpowered but lifts off well in no wind days.


Rafeek

Rodney,
Forgot to mention that I no longer have the plans and have been tweking it by trial and error.

Rafeek

Both of mine were SIG kits, one had a 1.20 4 stroke, the other a .90 4 stroke. Either engine was plenty. Your CG at 25% of chord should be fine, better a bit nose heavy than tail heavy, especially on first flights.