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Ultra Sport builders, I need your opinions

Old 03-11-2010, 08:42 AM
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prgonzalez
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Default Ultra Sport builders, I need your opinions

I need some help here...

I will start covering the wing this weekend and after reflecting on the building of the wing before I start covering, I started thinking about the belly section of the wing.

The instructions show this section using crossed grain balsa blocks. I only did two pieces like that (LE and TE) while I switched the grain direction (straight) in the center section of the belly, see pictures.

I got thining how this cross grain blocks add strength to the whole wing structure or are just for filling in the space. In other words, is the fiberglass enough re-inforcement to hold stress in the wing on this model?

Thus, If cross grain will actually add strength, I will redo the center section of the wing's bottom.

Pedro

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Old 03-11-2010, 08:59 AM
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Default RE: Ultra Sport builders, I need your opinions

If you fiberglassed the center wing joint , you should be O.K.
Old 03-11-2010, 09:08 AM
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outdoorhunting
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Default RE: Ultra Sport builders, I need your opinions

Yeah, the glass will definitly be strong enough.
Old 03-11-2010, 09:15 AM
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RCKen
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Default RE: Ultra Sport builders, I need your opinions

Yep, the fiberglass is where the strength is. The belly pan is there to smooth out the lines of the fuslage and keep it clean and looking good.

Ken
Old 03-11-2010, 09:30 AM
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ArcticCatRider
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Default RE: Ultra Sport builders, I need your opinions

Don't worry about it...like these guys said, the fiberglass tape is the real reinforcement.

In fact, on a lot of models the belly pans are simply ABS plastic.
Old 03-11-2010, 10:16 AM
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prgonzalez
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Default RE: Ultra Sport builders, I need your opinions

WOW,

This is what I love about RCU. Lots of good people willing to help out and share experiences.

Yes, I did fiberglass the wing per instructions. So, I will be okay. Now, I can continue with my plans of covering the wing and be closer to maiden flight.

Thanks a buch guys.

Pedro
Old 03-11-2010, 12:55 PM
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Default RE: Ultra Sport builders, I need your opinions

I recently finished an Ultra Sport 1000 and agree completely. The belly pan is cosmetic.

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