rockets with headers
Posted 26 October 2005 - 05:38 PM
one type is where the rocket is long burning and continues to accelerate throught the burn but stops rising right after the rocket has finished burning
the other type is a fast burning rocket that burns very quickly but continues to rise a while afterwards, obviosly when its rising without propulsion its less stable.
so which one do you guys think is the best to use with a header?.
Posted 27 October 2005 - 11:46 AM
Posted 27 October 2005 - 11:54 AM
For example: I make 17mm I.D. rockets with 33 grams of green powder
and they are able to carry a 150 gram payload(3'' shell) to a very respectable height.
Posted 27 October 2005 - 10:39 PM
Posted 30 October 2005 - 08:28 PM
Posted 31 October 2005 - 12:51 AM
370g is a very respectable payload! Do you have any pictures or videos of that particular rocket?
Posted 31 October 2005 - 01:46 AM
You can see a mess of Toms rockets in action in the video section at www.osff.net
Tom is a very good mentor I must say and I'm very lucky to have him as a fellow club member.
Edited by Maineiac, 31 October 2005 - 10:55 AM.
Posted 31 October 2005 - 10:49 AM
Its not finished yet, just a few more things to do. I'm also waiting for two extra long drills to arrive so I can bore out the last two rammers (not in photo).
I'm thinking about using 70 - 80mesh spruce charcoal since i dont have access to commercial 80mesh.
I having trouble viewing your website, I get a "sorry this image is temporarily unavailable" message.
Your a lucky guy to have Tom as a mentor! His work really is fantastic!
Posted 31 October 2005 - 11:17 AM
You tooling is looking quite good! Losing my machine shop access has been a bummer! One change that I would make is shorten the base on which the tube is set. I can't remember the exact dimension Tom used to make that to but I believe it was in the neighborhood of .375". This has been shortened drastically to about .125". This has allowed for more core length as we drill them out with a flat ground drill beyond what the spindle forms. I'll have to measure a motor this evening and see just what those dimensions end up being. Bear in mind there is a .500" delay of Winokur 39 on the top of these. This is drilled back only slightly after the passfire has been formed in the top plug. Nothing fancy for clay either, just straight Bentonite. Like Tom always says, there are no secrets.
Posted 31 October 2005 - 11:32 AM
Do you have any suggestions for a formula using spruce charcoal? How much should i reduce the percentage of KNO3 as a starting point?
Edited by JamesH, 31 October 2005 - 11:38 AM.
Posted 02 November 2005 - 12:07 AM
I've got some measurements for you finally. The dimension which was .300" (spindle base) is now at .0625" thus moving the nozzle closer to the end of the tube. The core is now 6.750" long (from end of tube) with the extra length coming from drilling excess comp out after pressing. A long .1875" drill works fine for this. Simply turn a quick bushing to fit into the end of the motor (centers drill in core)and afix a drill stop bushing to allow .300" travel into the core. Remember to regrind your drill point to a flat profile. The passfire is drilled down approx. .750" to the Winokur 39 delay(from top of tube). Mind you this is just starting to show the delay so from this you can extrapolate the grain length etc.
I don't believe there are any other changes. The shortening of the spindle base could be overcome by simply turning down the base. A quick fix is to make a simple bushing to adjust the height.
If I can answer any other questions about these motors let me know and I'll see what I can do.
Posted 02 November 2005 - 02:29 AM
Thanks for digging up those dimensions for me!
Edited by JamesH, 02 November 2005 - 02:30 AM.
Posted 02 November 2005 - 02:46 AM
Posted 02 November 2005 - 03:04 AM
Posted 22 November 2005 - 04:11 PM
2 Oz BP Coreburner with canister payload of pumped Conkling KP Organic Blue stars. Keep the rocket vids coming!
Working on getting nicer symmetrical breaks. Nothing comes easy
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