- This topic has 13 replies, 4 voices, and was last updated 15 years, 7 months ago by
MikeS.
MikeS.-
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MikeS
I was going to test fire this sugar motor on 10-8-09 but could not.
I was not happy how this batch mixed, so I did not want to
put it into a rocket.It went pretty well.
1″ PVC X 9″
“warning….photobucket in the past has put girl stufff as
advertisement here. There is none now, but I bet it will show
up. I stopped using photobucket, but wanted to upload the
video.”edward
Looks very good! What are you using? Sucrose? Also, where are you getting your KNO3?
Edward
MikeS
Potassium Nitrate
Sorbitol
Iron OxideI mix small batches by gram weight.
Could never find any of this stuff in the Cheyenne area.
May be available in Colorado.Skylighter has been very prompt with shipping and
quality seems great.This compaired to other tests was a little lazy.
edward
Are you using the 65/35 mixture? I found sorbitol much easier to work with than any other of the sugars. I bought my KNO3 from a supply house in Denver – it was .40 cents/lb in 50 lb bags in 2003. I found a place in Denver also that sold sorbitol in 50lb bags for $1.50/lb.
I might have to dig up some of my old notes and make a 75mm motor soon….just love that roar.
Edward
MikeS
Yes. 65/35.
Some very good prices. If they are still around, let Me know.
Tom Martin
Mike, that does seem to be a poor burn to me. The exhaust plume seems to be kind of week and inconsistent. I am still in work putting together a test stand and would love to see some actual numbers from some of these motors. I would love to play with some of the sugar motors but I still here lots of horror stories about consistency. I’m sure you made this motor just like your others but the photos / video of your other motors showed better performance. So what was the difference? Was the weather just more humid when you made this motor, or was it the phase of the moon?
edward
If people want to test motors I’ll be more than glad to bring my test stand – I can go up to 220 lbs and 2500 psi, at up to 50kHz. It would be nice to have a static test day.
Edward
mule
Mike/Edward.
Jeremiah and I have a test stand too, but I don’t know what the max it can test is. Maybe Jer will chime in on this. I’m trying to figure out a way to do tests in Broomfield on our Church’s property – North of town. I have a partial berm built and was thinking about digging a bunker of sorts. Not sure what the rules would be though. Do you have any ideas? It’s on 20 acres.I also have a friend with 35 acres and no close neighbors up by Carter Lake. He’s already given me permission to test there and has plenty of dirt piles to hide behind. We need to have a test day…. Well, Jer and I need to do some more mixing, we don’t have any test straws made for burn rate & chamber pressures. Lots of grains though.
Gregedward
Very nice! I’ve built quite a test stands over the years and this one is my favorite, fires vertically for hybrids and was within 1% on the NAR data for my certs. I’ve also got a 5000lb one for those big motors…but that one is only set up for 6″ motors. I have a place I test up here in Fort Collins – on some acreage w/o no crops and no people.
Edward
MikeS
Probably My ‘pinch’ of Iron Oxide’…When I started making sugar
motors, the web site I used suggested a pinch of iron oxide to
a 65/35 mix.How much is a pinch?
I have since read a couple places suggested putting about 1% iron oxide. by weight. That is a more precise measurement, and two to three times what My pinch is. I will not over do it in the future but will put somewhat
more in My batches.The slow soft burn was probably due to that.
I will test one, I was going to fly, saturday and put the results up
that day.
MikeS
edward
Tom Martin
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