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Old May 18, 2013, 03:19 AM
Dave Pope Manawatu NZ
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Palmerston North NZ
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2.8 Poor Mans DSer

Hi All,

After a bit of info.

Has anyone bagged a wing with balsa sheeting in the layup, my little brain says it should work but would be good to hear if someone has done it.

Also suggestions on tailplane foils for a T tail, should it be symetrical or a lifting foil, we are running a RK40 on the wing.

Cheers
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Old May 18, 2013, 06:56 AM
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For the wing Dave I'd use .5mm vaneer, much better than balsa.

For the tail....HT14 or 12. Are very popular. Used on many top end moldies today.

http://www.charlesriverrc.org/articl...t-airfoils.htm

Tim
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Old May 18, 2013, 01:50 PM
Dave Pope Manawatu NZ
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Awesome thanks Tim. RCG is a great source of info instead of playing around in the dark.

The only reason I was going with balsa was that I have heaps of 1.5mm and seeing as its a poor mans play thing it seemed to be the way to go. We were not going to use any but I thought it would help with strength to seperate the composite layers.

some pics for a laugh soon.
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Old May 18, 2013, 02:11 PM
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For DS you might consider some glass under the balsa.
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Old May 18, 2013, 04:07 PM
Dave Pope Manawatu NZ
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yes was going to sandwich the balsa with glass and carbon, will be heavy but we get wind .lol
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Old May 18, 2013, 04:10 PM
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the 2.8 PMS (poor mans soarer)

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Old May 18, 2013, 04:32 PM
Sketchy builder
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lol
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Old May 18, 2013, 04:45 PM
Evolution is a way of life !!
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Quote:
Originally Posted by alex hewson View Post
the 2.8 pms (poor mans soarer)


+1. :d
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Old May 18, 2013, 10:01 PM
AvB
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Dave I did all the first SC1, SC2 and Scratcho tails with balsa. Just 3 or 4mm thick. Sometimes I 3M sprayed 2 or 3 layers of thinner balsa together. Just hand shaped the LE roundish, and the TE fairly tapered, concentrating on keeping the shaping symmetrical but about 60% of the surface was just flat. Then vac bagged them with some carbon (on bias) and glass and maybe some strips of unicarbon across the span. Works great. Personally, I have never felt that a flat slab stabilizer or fin loses anything in performance to a special foil.
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Old May 18, 2013, 11:20 PM
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Just going out to take my PMS for a spin...

HA

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Old May 19, 2013, 04:08 AM
Dave Pope Manawatu NZ
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awesome love the name, it will stick, and one can get pms when the wing folds in half.

Us DSer's are a strange bunch, I was saying to Garath the other day. When finishing my new AFP60 it was laid on the bench so it would not get marked, looks great, then we go to a big hill with lots of rocks and no LZ and peg it off. lol

Also when I was power flying and there was a mishap like a wing breaking everyone goes thats bad and are not happy, but for some of us when ripping round the DS circuit BANG goes the airframe and its whoo who, did you see that. lol.

But I must admit its great to build a slopie for a purpose instead of just front flying.
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Old May 19, 2013, 05:01 AM
AvB
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Good observational philosophy / psychology there Dave.
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Old May 19, 2013, 05:27 AM
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You are a keen man, Dave. You are the NZ Timbo/Andrew equivalent =)
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Old May 19, 2013, 05:49 PM
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Dave, I've bagged a bunch of wings with balsa. I think it's great. It's easy to work with. My little Atom planks are blue foam core, 1mm balsa skins and couple layers of glass and hardwood LE and they are pretty tough. Outlaw speedo is same. It's really easy at those little sizes 'cause you don't need to bother with a spar. I guess if yours is 2.8 your gonna need something. Anyway, considering loads of mouldies are just a couple layers of glass seperated by a balsa core, it cant be any worse than them.
My 2c, YMMV, IMO etc
simon
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Old May 20, 2013, 05:14 AM
Dave Pope Manawatu NZ
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progress

A few pictures, a expo spar, pine 20mm lam with carbon and strip aluminium. Test spar was installed into my AFP75 with carbon to cover all surfaces. So we will see how it goes.

Wing cut and taped, need a longer bench. the wing will be a 3 piece 1400mm centre and plug in 700mm tips.

The templates look different but its a wire cut method the we now use for live hinges.
The foam is cut to the airfoil on the bottom surface and the TE is thickened on the top to get a good TE. then just before bagging to top surface is sanded down to mico thin. (love green foam) If you don't know what I mean and are interested I can do a video of the process. But then maybe it's old news.

LE are now on and spar layout has been worked out but lost the photo, so might post tomorrow night.
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