Kestral

[John A. WilkeParticipant]

For my KestreL I used 4 ea. 1/16″ polystyrene shear pins and I had a 1/16″ vent hole up top.

I used a smaller chute (30″ IIRC?) and I have flown things thattaway 6-8 times…

Your actual mileage may vary.

[greywolves]

Hey,
Yeah, 3 rail buttons, but there little ones, and besides barn door open usually keeps my rocket cool, so why should this one be any different. I ended up going with a vent towards the top, figured by that time, the piston had everything already out. Rail buttons could be used for a guitar strap for portage, he he. Still need to ground test, going to start with same thing I used for Little blue dawg, .3 gm for booster and .6 gm. for nosecone. Anyone else use a much different amount of powder?

[edwardModerator]

On a slightly bigger rocket (volume wise) I used 1 gram for the drogue and then 2 grams for the main.

Edward

[John A. WilkeParticipant]

My KestreL (which is, of course, the same size as yours) had 1.125g of 4F for the drogue and 0.6g for the main. No piston on the drogue, but I did have a piston up top.

The lower was contained with surgical tubing.

Edward – I think your reference was for a 2.5″ diameter rocket, correct? That makes more difference than you might expect vs. the 2.125″ diameter (r^2*pi) I think you also had a bunch more vertical space. Bottom line, there isn’t much room in the KestreL.

Always – always, always ground test. Add a bit more bp and reef the shock cords and you will be just fine…

[Author]

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