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Super Sportster .90-1.20 CG issue

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Old 11-24-2013, 03:32 PM
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jsf135pal1
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Default Super Sportster .90-1.20 CG issue

I just finished building this kit and installed everything including OS .95 ax motor and according to the CG Machine I need to add 12 ounces in the nose. I set the machine at 4 inches which is about 32% of wing chord and I placed the plane on it upside down. I have heard they are tail heavy but almost a pound?? Has anybody else had this issue with this plane?
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Old 11-25-2013, 04:49 AM
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I have never built the 1.20 size. but the three smaller versions that I've built, all required nose weight.

If you have everything moved as far forward as possible, just add the weight and go fly.
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Old 11-25-2013, 08:22 AM
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daveopam
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Can you slide the motor forward any? It should balance right on the main spar when inverted.

David
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Old 11-25-2013, 02:25 PM
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Quote:
Originally Posted by daveopam View Post
Can you slide the motor forward any? It should balance right on the main spar when inverted.

David
I messed up!!! I was trying to balance it on a very uneven surface so I just found out. I only added about 4 oz. in the nose with CG at 4 5/8" which is 34% of total wing chord. Thanks for the help.
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Old 12-02-2013, 09:06 PM
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I built one back in the early 90's with an ASP .91 and had to add about 2 oz of lead to the nose. It is still flying today but now has a 1.20 stroker on it.
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Old 12-03-2013, 01:11 PM
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I have a Saito 150 on mine, with the servos just aft of the wing in a compartment, it didn't need any nose weight.


I've found that I like it a little tail heavy. But for the first couple flights your going to want it right on.
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Old 12-03-2013, 03:53 PM
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Quote:
Originally Posted by yak86 View Post
I have a Saito 150 on mine, with the servos just aft of the wing in a compartment, it didn't need any nose weight.


I've found that I like it a little tail heavy. But for the first couple flights your going to want it right on.
Thanks yak86. What did you use for your CG measurement? How many inches from leading edge?
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Old 12-03-2013, 04:49 PM
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I think it was at 4" back. I had a small piece of lead next to the motor but that came lose one day and i decide to fly it and it flew fine. so its alittle tail heavy now. I think with this plane theres alot wiggle room in the CG.
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