Sidewayskiwi
1529843820410513037347.jpg  15298438880641397132668.jpg  1529843966437614805497.jpg 
Starting the drywall tape reinforcements on the top side will add the carbon rods and reinforce the underside same as the top
DTF SU34 (32 inch wingspan) was just under 700grams ready to fly
Eager to see how light this will be
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Sidewayskiwi
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Carbon reinforcements used 5mm as 3&4 mm used in earlier models with hobbyking foam proved weak
3mm carbon strip in elevons and rear wing deck
Bent the rod in the canards to preserve battery bay access (and increase stiffness)
Wing plate 122 grams complete (pre KF)
That's around Half of DTF board as it takes two DTF sheets to make this wing plate
Engine pods 16 grams each with 4 grams of reinforcements
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Sidewayskiwi
Engine pods on / tails fuselage as well looking at 500-500 gram flying AUW
That's a nearly 200 gram saving over last SU 34
But boy do I have to reinforce
The glue iam using losses @ half its weight when it dries
Did the KF2 leading edges last nite no matter how sharp the knife hobbyking foam just tears or gouges
Time to get the gorse out of my pocket and import some depron I think
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Sidewayskiwi
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Seems to be the way forward for the hobbyking foam
Absolutely no reinforcements
8 grams bare
13 grams finished
Tripled the strength
Used brown masking paper (from car painter mate)
Watered down PVA glue ( Elmer's glue to you guys )
Once dry and cured press flat between plates stays straight
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Sidewayskiwi
Found the glue wouldn't hold the brown paper (peeled easy)
Used minwax water based (told you can use Klear floor wax)
Much better results
Similar weights
Just as hard
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bogusbandit56
Quote:
Found the glue wouldn't hold the brown paper (peeled easy)
Used minwax water based (told you can use Klear floor wax)
Much better results
Similar weights
Just as hard

Glad to see you making headway with the HK foam
It`s very difficult to prevent tearing of the soft HK foam, I use a Swann Morton scalpel and number 11 blades and you need a cutting pad underneath the foam to save the sharpness of the blade.
I use those cheap thin polythene kitchen cutting mats.
Wot, no Depron?
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Wildthing
Going to try a new foam myself now because the regular white Depron is no longer, still can get the Aero and grey but sold out of white. So now RC Foam has this stuff called Fli-Power Value XPS RC Model Foam, sheets are 24" x 48" which means splicing together almost all main wingplates . 16 sheets for $50.00 US.

https://www.rcfoam.com/depron-and-epp-foam-suppliers/closed-cell-xps-model-foam/value-xps-closed-cell-xps-p-1603.html?osCsid=abde952877504046246435a8c32079f6
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Sidewayskiwi
Quote:
Going to try a new foam myself now because the regular white Depron is no longer, still can get the Aero and grey but sold out of white. So now RC Foam has this stuff called Fli-Power Value XPS RC Model Foam, sheets are 24" x 48" which means splicing together almost all main wingplates . 16 sheets for $50.00 US.

https://www.rcfoam.com/depron-and-epp-foam-suppliers/closed-cell-xps-model-foam/value-xps-closed-cell-xps-p-1603.html?osCsid=abde952877504046246435a8c32079f6

Found the brown paper reinforced samples now flat and hard
Reweighed now 15grams
(Down from the 20 grams )
So just under double the straight foam weight but tried the strength
It just took a heap of time to cure in the cold of winter here I suppose
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