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weight of ribs in speedster rear surfaces

 
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Mark.Summers(at)lwbref.co
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PostPosted: Fri Jan 13, 2006 6:36 pm    Post subject: weight of ribs in speedster rear surfaces Reply with quote

I want to splice the rear clip from a speedster to a KF2 for repairs and to
get the taller vertical and rudder but too heavy does anyone know how much
weight I can shed by removing the ribs.


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rliebmann(at)comcast.net
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PostPosted: Fri Jan 13, 2006 7:18 pm    Post subject: weight of ribs in speedster rear surfaces Reply with quote

Hi Mark,

What is the rear "clip"? I built a Model 2 which I still fly. Which ribs
are you referring to when you ask about removing them? I can answer any
questions regarding your Model 2 and will be glad to do so.

You can e-mail me direct if you like at rliebmann(at)comcast.net
Chicago area


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Mark.Summers(at)lwbref.co
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PostPosted: Sat Jan 14, 2006 3:07 am    Post subject: weight of ribs in speedster rear surfaces Reply with quote

I bought the aft 5 ft of a speedster to attempt to splice onto my KF 2 I
have tube damage from where the vertical attaches on the top cross tube. I
guess you would call it the most aft section of the fuselage. I don't have
to splice on the entire 5 ft but will have to start forward of where the
vertical starts. The speedster has all the surfaces and they are all ribbed
and fabriced with electric elevator trim built in. The horizontal and
elevator weighed together are 5 lbs heavier than my old ones, so I know the
vertical and rudder will out weigh the old by more than that. I would like
to have the speedster tail [10" taller vertical and rudder] either way it
goes I have to replace the most aft appr. 4 ft of my KF2 fuselage. Thanks
Mark


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flier(at)sbcglobal.net
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PostPosted: Sat Jan 14, 2006 6:03 am    Post subject: weight of ribs in speedster rear surfaces Reply with quote

Hey Mark,

If I had to take a guess, considering the difference in configuration
between the lighter gross Model 2 and the Speedster I'd suspect you're gonna
definitely end up in a tail heavy situation no matter what you do. The
splicing alone is going to add a couple of pounds back there then as you've
noted the larger structure is going to be a problem. I know with my Model
IV 1200 that has all the speedster tail stuff on it I'm at the back side of
the CG envelope to begin with -- and the IV fuselage was adapted to handle
it to begin with.

The ribs aren't going to save much. The additional steel in that tail
including the cutout for the trim tab, the trim servo & mounting, the gap
closure stuff, etc are all going to put you pretty considerably tail heavy.

Another issue to be careful of is the change in the resonant frequency of
the fuselage and tail. IF you do get it all together and balanced, during
test flight, particularly at high throttle settings, keep an eye on the tail
to ensure you don't end up with sympathetic vibrations back there. Splicing
those longerons is going to make the tail stiffer and vibration would surely
be a problem at those splice welds.

Only my opinion.

Good luck,

Ted

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Mark.Summers(at)lwbref.co
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PostPosted: Sat Jan 14, 2006 7:40 am    Post subject: weight of ribs in speedster rear surfaces Reply with quote

I appreciate your insight, what motor do you have on your kf 4 I have the
582. I believe my old horizontal and elevator will mate up to the speedster
tail. I'm figuring 1lb for splices max, and thinking if I strip down the
vert and rudder put my old hor. and elevator back on maybe 4lbs increased
weight not sure if thats a acceptable weight. The old weight and balance
[empty] was right main=255lb
left main= 245lb
tail = 39lb x158.25" =6171.75div by 539= 11.45" aft CG
Thanks Mark


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