Thread Tools
This thread is privately moderated by sir_clive, who may elect to delete unwanted replies.
May 20, 2012, 04:16 PM
sir_clive's Avatar
Thread OP
Build Log

OSG pimped for the Slope #2

Things are moving...

I ditched the previous wing (it took me some tears to rip that spar out of the EPS) and made a new one, this time painfully taking care that the wire of my hot-wire cutter is as straight as possible.

I'm very happy with the result - good that I got rid of the old wing!

In the mean time, the laminating epoxy is ordered (Hobby King sells stuff from BSI, it should be very good), 48g GFK too, now I can only wait. There is enough to do anyway, I won't be bored.

I also ordered the servos from Giant Cod (now Giant Shark): Tower Pro MG90, cheap ones getting pretty good reviews, they should be here until the end of the week.

I was contemplating for a long time whether to put that polyhedral or whether to go with a flat wing. Finally, for practical reasons (position of ailerons / flaperons), I opted for a flat wing. Unfortunately, my main spar was already cut to 90cm flat wing segment of a (planned) polyhedral wing and glued in, so now I have to think of a way to connect it to the outer panels. This hobby seems to be a never ending series of bad decisions...

One thing bothers me a bit: the S6063 profile thins out into virtually NOTHING. The TE is so thin, the hot wire cutter melded way into the EPS, destroying some last 2-3cm. Even if it didn't, the last approx. 2cm would be thinner than the two 1mm balsa skin sheets. I decided to cut off the trailing (and badly cut) EPS part, glue a 3mm depron sheet instead and sand it down as thin as possible. You can see the result in the pics below, I did an trial run (sheeting with balsa, adding depron). Looks OK, but it's not *the* S6063 profile.

I'm also a bit worried whether such thin ailerons will be able to withstand the wind forces. I hope the GFK will give them the needed strength, without making them too thick.

Covering this wing with balsa will be one stinky job! I was lucky to find one shop which sells UHU Por in a 570g can (for QUARTER a price of what one needs to pay for the same amount packed in tubes!), but just opening the can was a bad thing to do in a living room. I guess I'll have to move in the computer room to continue the job.

Here some pics.
Last edited by sir_clive; May 20, 2012 at 04:23 PM.
Sign up now
to remove ads between posts

Quick Reply
Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion congratulations, race pimps MtnGoat Life, The Universe, and Politics 217 Apr 22, 2012 12:14 PM
Discussion Jumping into 2.4GHz for slope soaring ScienceGuy Radios 1 Feb 05, 2012 08:56 PM
Help! Search: 1.6m/2.5m slope racer for light to middle conditions sky_surfer_fra Slope 1 Jan 04, 2012 09:25 AM
Wanted 2 meter 2.4 friendly slope glass ship. kilgoretrouts Aircraft - Sailplanes (FS/W) 0 Oct 06, 2011 02:11 PM