Foam RTM 58 psi High Load Order ?

[shane]

Have been looking around for some good foam for vac bagging wings & tails or whatever ,i have found some but the shipping from Sydney could make 2 blocks cost to much.
DOES ANYONE WANT FOAM .
40 mm * 600 mm * 2500 mm sheets ?
Can get it in 25mm ,35mm,40mm,45mm,50mm,75mm,100mm thick.
40 mm mite be best for wing thickness vs cost unless your wing is thicker than 30 mm then you would have to go with a thicker foam.(the foam has 3mm grooves on both sides)
Please show your interest ! price will be $65 plus.(do'nt know yet)
Probably get 3-4 planes out of each block depending how big.

[sean]

Hey Shane, I may be interested. How would it differ to blue foam (eg lighter, heavier, stronger, cuts better etc)? Could it be carved and shaped as nicely as blue foam?

Sean.

[zipper]

We have found that the higher density blue foams don't cut very cleanly with a hot wire, there are small hard lump in it that make the hot wire drag and create corrugations and also burn grooves into the foam. We use 20 to 40 psi blue foam and have never damaged the foam with 28" of vacuum.

Glenn

[shane]

Sorry Sean did'nt say it was blue foam ,it is blue foam, easy to shape and sand ,made my Voltij out off the stuff also VHO on RC Groups made his Supra wings out of it .
I,m going to make some DLG's out of it and cover in lite kevlar ;D

[felix]

*edit.....should have read the first post

i'm definately interested,will pm when i figure out what i need.

[shane]

Almost ready to order blue foam.
PLEASE PM ME.
The sheets have 3.5mm grooves on both sides.
So wing thickness plus 10 mm should be OK ......just.
you can cut these in half thickness wise with a bit of extra work.
I will put a final list together Thursday night for Friday.
RTM * 25 2500 600 $ 34.80
RTM * 35 2500 600 $ 48.73
RTM * 40 2500 600 $ 55.69
RTM * 45 2500 600 $ 62.64
RTM * 50 2500 600 $ 65.52
RTM * 75 2500 600 $ 98.26
RTM * 100 2500 600 $ 122.83
RTM * 120 2500 600 $ 147.4
This is the price per sheet no postage. (hope the postage is not to costly).

[shane]

Ordered foam ,the price is $110 per 75mm * 2500mm * 600mm sheet.
Should be good for two thick wings per thickness or three thin wings per thickness ( 75mm ).
People i know that want some are;
Me
Jeff
Sean
Felix
Matt thunderbirds flyer
Pete? From Wowings
Hope to have it in under two weeks

[portfox]

Isnt there a place at Eagle farm that sells the blue foam? or is it the wrong specs?

Steve

[sean]

Thanks for that Shane, sounds good!

Steve, there is, but they don't have this higher density "high load" foam.

[portfox]

How did you guys go with the foam? All good?

S

[felix]

Hey good news and pm sent….now I’ve got to tool up for the bagging skils jirvin taught us.

What company supplies that blue foam at eagle farm? Would love to get hold of some cheaper stuff for a few ideas I have running around in my head is all

[portfox]

Felix
Awesome stuff, i'm on that road as well, how did you go with the pump, did you get a old fridge one?

[vh7377]

Just noticed this thread.

I have tried a heavier foam than RTM (FP75) (~75psi) and found it does tend to get ripples around the leading edge. I think this is because I haven't yet worked out the optimum combination of temperature and speed. But given that foam is 20% heavier than RTM I haven't serioulsy used it (although thinking of a Supra CP spar).

However, I have used FP50 with good effect. This is 50psi foam, not the ~ 60 of Hiload 60 or ~58 of RTM. It is easy to work with, approx the same weight as RTM (maybe a smidgeon - interpretation = tiny morsel - lighter). It is a little bit softer than RTM but this makes it easier to work with the TE's which tend to be more brittle with CNC cut RTM.


The main advantage was that it was substantially cheaper when I got some from www.dctech.com.au (once called Aerodynamic Developments) in Western Sydney.

Only problem could be in Supra Spars. Easily fixed. Add 1 extra wrap of 1.5oz glass (around the spar) before bagging. Might bend a bit but hasn't broken (yet). ;D

Hutton