Author Topic: Profile construction....?? (Read 761 times)

jim gilmore · « **on:** March 28, 2009, 04:47:46 PM »

I have 2 quetions on the qaakromaster I'm building.
First question is that when I glued in the engine mount blocks I first glue the blocks in and leave the doublers off. I do 1 at a time.On the lower block the mount doesnt fill the space so I took heavy card stock type paper. cut it folded it and epoxied it all together. I'm guessing that filling the space is better than a void?

My second question is that I'm considering adding a smallish false cowl? like the shoestring has . would that help with strength and vbration ?

Alan Hahn · « **Reply #1 on:** March 28, 2009, 07:33:53 PM »

I think you were right to fill the void--but I would have stuffed in some thin slices of balsa--however yours probably will be as strong--maybe even stronger.

A cheek cowl would look nice. I'm not sure how much strengthening or vibration dampening you need with these newer 2 stroke engines (FP, LA, or Thundertiger 10-15's). They already run pretty smoothly compared to the older iron piston engines.

Leester · « **Reply #2 on:** March 28, 2009, 07:36:45 PM »

As far as the motor mounts, normally test fit and if any gaps fill with balsa. Gaps are usually there to fit different size engine cases.

Wynn Robins · « **Reply #3 on:** March 29, 2009, 08:03:29 PM »

A tripler (cheek cowl) will add strength - to add to the vibration dampening - extend the "cowl" back and fix it to the leading edge sheeting- this will help transfer any vibration back through the airframe

Author Topic: Profile construction....?? (Read 761 times)

jim gilmore

Profile construction....??

Alan Hahn

Re: Profile construction....??

Leester

Re: Profile construction....??

Wynn Robins

Re: Profile construction....??