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Old Dec 23, 2012, 02:48 PM
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Ashford. Kent. England
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Thats what we are like...old farts brought up on feet and inches before we went metric.. now using foam in mm thicknesses... we don't get confused but we confuse others...lol

The units showed as inches so that the area when I selected it, read out in square inches... I can envision my models in ozsqft.. but the metric equivalent baffles me

The span on my Xmas delta is 19"... I forgot to add that to my sketchup drawing..the final weight without the battery is 37gms.... 1.321429oz... 0.892ozsqft the glide at this weight is great.. slow and steady... so not much power will be needed to get it flying..
It should go well on the stock setup from the micro SU model.. that is about 35gms but only has 52"sq area..

COG the markups on the plan were made using the online flying wing calculator.. at the moment I am behind both by about 0.5" and the glide is superb.. adding a battery will move my COG forward..

A smaller version would go at less weight..obviously.. and be a lot faster...

construction is from 3mm depron two layers with the foil between...uhu por used for the lamination..
there is a spline under which includes the tailfin of 2 layers x 2mm.. The elevons are 3mm depron as are the tip fins
I made a small depron block from odd scrap to take the thin ply motor mount.. the motor is screwed to the ply then cool melt glued to the front.. The leading edge is shaped and taped for strength..There is also a 3mm CF flat spar in the top layer

This flys a real treat
,
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Old Dec 23, 2012, 03:56 PM
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Shelby Twp, MI
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Well, my guess was close, within 1.6"
Thanks for the rest of the info, looks like a good flier.
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Old Dec 24, 2012, 12:48 AM
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Here's my Christen Eagle still WIP.

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Old Dec 24, 2012, 05:44 AM
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Shelby Twp, MI
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You do good WIP. Graphics are stunning, how did you attach the strips?
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Old Dec 24, 2012, 06:49 AM
Slipping the Surly Bonds
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Attica, MI
Joined Dec 2006
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Here is my Oshkosh Special 20. It is setup with a Vapor brick with a "Steve" converter for a brushless esc. Plans are here http://www.rcgroups.com/forums/showp...&postcount=437

Ken

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Old Dec 24, 2012, 08:22 AM
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Shelby Twp, MI
Joined May 2006
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Ken,

Nice plane, nice plans, thanks for the Christmas gift!
I might try it in 3mm Depron, as I have some of it at the moment. I also have some of those wheels from HK.

How did you get such a nice finish, is it paint?
What was your airframe and/or final weight?

Thanks for the info and have a Merry Christmas.
-Dave
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Old Dec 24, 2012, 09:24 AM
Slipping the Surly Bonds
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Attica, MI
Joined Dec 2006
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Dave,
This one is made from 2mm Depron. Empty airframe weight (gear in another model ATM) is 16.4g.

Most of the finish is the natural foam. The red is acrylic paint brushed on. Black lines and windows are Sharpie marker.

Ken
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Old Dec 24, 2012, 10:21 AM
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Shelby Twp, MI
Joined May 2006
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Ken,

That sounds pretty light, maybe it is a good idea to just get some 2mm Depron, because I will have balance issues with 3mm Depron, as more weight will be in the rear.

I downloaded the great plans, so it will go in the "to-do" box for now. Thanks
-Dave
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Old Dec 24, 2012, 01:06 PM
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Quote:
Originally Posted by dbacon View Post
You do good WIP. Graphics are stunning, how did you attach the strips?
I used very thinned vinavil, almost 70% water, then sprayed with transparent acrylic.
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Old Dec 24, 2012, 02:14 PM
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Shelby Twp, MI
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Interesting, what is Vinavil? I asked myself, and found:
http://www.vinavil.com/EN/
But I still don't understand, can you 'splain?
Thanks -Dave
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Old Dec 24, 2012, 07:09 PM
Dr John
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Lake Placid, Florida
Joined Dec 2001
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I have started a build thread for the Jumping Bean UMX here...

http://www.rcgroups.com/forums/showt...3#post23612687

Dr John
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Old Dec 24, 2012, 07:19 PM
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It's a brand for a glue, but commonly used here to refer to the white glue used primarily for wood but also other porous materials. I did a research and the English term should be PVA glue.

See http://artemarcia.com/mosaico/grout-...store=italiano and
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Old Dec 25, 2012, 08:43 AM
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Oxford, Michigan, United States
Joined Aug 1999
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Or Elmers here in the states.
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Old Dec 25, 2012, 03:17 PM
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Shelby Twp, MI
Joined May 2006
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Thanks guys, now I must ask, what's it for? Is it a primer, filler, bonding agent?
Because I found floral spray colors to work well on Depron and EPP.
Krylon for plastic does too.

Merry Christmas
-Dave
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Old Dec 25, 2012, 05:11 PM
Gravity impaired
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United States, NY, Wolcott
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Quote:
Originally Posted by Petefoss View Post
Or Elmers here in the states.
Weldbond works great!
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