[sugpro] Re: PVC Delay Grain Trouble
- From: Peter Johansson <rockets4kids@xxxxxxxxx>
- To: sugpro@xxxxxxxxxxxxx
- Date: Mon, 9 Mar 2015 09:16:08 -0400
What are you using as your delay grain material? I have been using
the KNO3 + RIO + Epoxy composition and I have never had one fail to
ignite.
I do recall some problems very early on when I was just experimenting
with production, and I learned you do need to *seriously* mix
everything together until you get a nice smooth putty.
If you are getting that nice smooth putty, all I can think of is that
you might want to try another brand of epoxy.
-p.
On Sun, Mar 8, 2015 at 8:47 AM, Bill Kuker <bkuker@xxxxxxxxxxxxx> wrote:
> For a few years I have been flying PVC motors with great success. I started
> with designs similar to Richard Nakka & Chuck Knight, and have simplified
> some steps in construction by using the right fittings, and changed to
> machined steel nozzles.
>
> Ignition, flight, and overall performance have been spot on and very
> reliable, I am working on drawing up all of the details to share.
>
> My recovery rate is 50% at best. My delay grains are exactly as described
> here: http://www.nakka-rocketry.net/pvcmot7.html
>
> Each flight either works perfectly, with ejection at just the right time, or
> I dig an unlit delay grain out of the wreckage. Does anyone else use this
> style? Any tips on how to make it reliable?
>
> -Bill
>
>
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