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36" Slingsby Prefect

Posted: Tue Jan 03, 2017 12:11 am
by Monz
Made a start on another one of these to replace my now retired (trashed) previous version. I messed up something somewhere and the formers were skew which I only saw after glueing so had to add some 1/16th stringers top and bottom of opposite sides of the rear fus to balance things out again. Not sure how it happened, but it won't be seen once covered. 2.2g so far

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Re: 36" Slingsby Prefect

Posted: Tue Jan 03, 2017 4:07 am
by Jim Moseley
Look forward to progress, Monz

JM

Re: 36" Slingsby Prefect

Posted: Tue Jan 03, 2017 11:13 pm
by Monz
Bit more done. Finished the fus and built the tails feathers. I screwed up somewhere so there are some skew bits which I've fixed best I can. So will finish this in plain tissue and see how it flies with the new wing section before building another with a scale finish. 7g so far.

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Re: 36" Slingsby Prefect

Posted: Wed Jan 04, 2017 4:14 pm
by faif2d
I have looked at that plan a number of times. Now after seeing your bones I think I will move it up on my list! You do beautiful work.

Re: 36" Slingsby Prefect

Posted: Sat Jan 07, 2017 5:57 pm
by Monz
Thanks faif, it really is a nice little model, especially at 36".

I managed to get this 99% completed on Thursday evening. Just the wing struts and wheel to add.

I used to light a balsa for the leading and trailing edges of the wings which led to them bowing quite badly so I added a length of 1mm carbon rod right through each one. That solved it mostly. There's still a slight bow to them but I can live with it for a test model.

Covering was Hobbycraft tissue with two coats thinned banana oil to seal. With ballast to bring the CG to about 20% (that's what the old one liked for outdoors) the weight is 20.8g, less than half the weight of the old one. Now for some decent weather...

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Re: 36" Slingsby Prefect

Posted: Sat Jan 07, 2017 9:23 pm
by Pete Fardell
Very nice! 20.8g sounds like an absolute feather for 36" span. You'll be in danger of losing it at that weight.
(Btw, have you started that tank glider yet?)

Re: 36" Slingsby Prefect

Posted: Sat Jan 07, 2017 10:35 pm
by g_kandylakis
Yes, I remember now... 0,5 Moniques...

quick AND ggod looking too...

G

Re: 36" Slingsby Prefect

Posted: Sun Jan 08, 2017 1:38 am
by Monz
Pete Fardell wrote:Very nice! 20.8g sounds like an absolute feather for 36" span. You'll be in danger of losing it at that weight.
(Btw, have you started that tank glider yet?)


If it flies away I'll just build another ;)

The AN-40 will start shortly ;)

Re: 36" Slingsby Prefect

Posted: Sun Jan 08, 2017 1:39 am
by Monz
g_kandylakis wrote:Yes, I remember now... 0,5 Moniques...



G


:lol: :lol: :lol: :lol: Ah I've missed this place 8-)

Re: 36" Slingsby Prefect

Posted: Mon Jan 09, 2017 7:13 am
by rgroener
Nice one Monique, I would start to make wood ready for a new one ;)

Roman