Re: Micro Maxx Rocket Parts

I assume they are balsa, as I used sanding sealer, and pushed a wooden "tip" into it by hand for the tip of the asp nose cone.

he (andy) has got the Sandhawk and the Wac as well as kits.

/ArtU

What is printed on the foam sheet in the way of manufacturer name, brand, or other identifying label?

Bob Kaplow NAR # 18L TRA # "Impeach the TRA BoD" >>> To reply, remove the TRABoD!

Sounds like rigid urethane foam.

actually the foam itself is EXTREMELY flexible (could bend it in half almost without snapping.

the poly/mylar coat> > the foam I use is NOT the normal pink or blue foam.

Uh oh! Is this the stuff that sort of crunches instead of deforms if you press a finger in it? Or perhaps crumbles into dust if you rub it, especially against itself. Sounds like urethane foam. Usually tan or green.

NEVER hot wire or burn urethane foam. The fumes are deadly toxic! This is also a serious hazard if your rocket were to catch fire.

Most modelling is done with styrene foam. Typically white (often the beady stuff like used in the disposable coolers and cups), pink, or blue. This is the stuff you should be using, and is safe to hot wire. It's usually lighter.

The only white foam I've seen that crunches and crumbles like urethane is Rohacell, made by a German chemical company. It's actually designed for full size sailplane construction, and is ideal for our use. Except for the COST! It's sandable and hot wireable. It's available in several densities from 1-5#/ft^3, and as thin as 1mm IIRC.

Bob Kaplow NAR # 18L TRA # "Impeach the TRA BoD" >>> To reply, remove the TRABoD!

Hmmm... I suspect the smallest available may well be .25 caliber pistol bullets, which would be a tight fit in a minimum diameter MM rocket.

-dave w