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S1 R/M ? on build

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S1 R/M ? on build

Post  oldguy on Thu Feb 01, 2018 5:15 pm

I have mention before i'm scratch building a Sterling S1 RM from plans.
I have question on the wing construction. The instructions call for 1 main spar 1/4 x 1/2.  I'm thinking about going with two spars, 1 across the top of the ribs and one across the lower side of the ribs.  I'm thinking about doing this because of ease of construction, and I have always built my .15 size wings this way.  This is my first .35 size plane so i'm asking here for pros or cons on this decision I have come to.  

Another question is.  What weight should I shoot for on  the S1 RM, to be a decent flyer?
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Re: S1 R/M ? on build

Post  Cribbs74 on Thu Feb 01, 2018 6:45 pm

The conclusion you have come to is a wise one. The internal spar aka “rib ripper” should be avoided. What you propose will work fine, but in all actuality it’s not really needed at all. The leading edge is the strength in that wing.

Some other tips:

Use the inner hole on the 3” bellcrank. Less is more with that big elevator.

Glass over the leading and trailing edge splits with epoxy soaked cloth or any strong thin material.

1/16” ply is all that is needed for the doubler. 25-32oz and it will manouver well.

Have Fun!

Ron
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Re: S1 R/M ? on build

Post  oldguy on Thu Feb 01, 2018 7:13 pm

Thanks for your thoughts Ron.
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