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  #111  
Old 04-18-2018, 11:50 PM
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BEC BEC is offline
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Well, as I say, given the market for "regular" 18mm motors, hopefully they won't have this issue.

I have more than once thought of building another Nova Paylaoder with a stage coupler or two inside above the motor mount to "harden" it a bit against the effects of the D10.

I was also going to add to my previous post that I once flew a BMS School Rocket with a payload section to over 2000 feet on a D10. This was at an Oregon Rocketry launch held at the Tillamook, Oregon airport (!). I would not have found it myself, but others in the group managed to direct me to it, so I did get it back.
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  #112  
Old 04-19-2018, 12:10 AM
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Quote:
Originally Posted by BEC
Well, as I say, given the market for "regular" 18mm motors, hopefully they won't have this issue.

I have more than once thought of building another Nova Paylaoder with a stage coupler or two inside above the motor mount to "harden" it a bit against the effects of the D10.

I was also going to add to my previous post that I once flew a BMS School Rocket with a payload section to over 2000 feet on a D10. This was at an Oregon Rocketry launch held at the Tillamook, Oregon airport (!). I would not have found it myself, but others in the group managed to direct me to it, so I did get it back.
The D10 seems to be a "tortoise motor" rather than a "hare motor" (like the D21), in that instead of reaching top speed immediately and then wasting much of its energy against air friction, the D10-powered BMS school rocket more gradually accelerated to its maximum velocity (slower than it would have gone on a D21, I suspect), gaining a good deal of altitude in the process, then coasted higher overall because it generated less drag. Also:

Be glad it wasn't one of your Super Flea-like, break-away drag recovery models from the Estes plans book (a BT-20 or ST-7 size, 18 mm motor-powered up-scaled Super Flea might be interesting...), or no one might have spotted it! :-) I agree--those "stone-ized" 'fish paper' stage couplers provide good protection from burning ejection charge particles and 'heat soak' (my Astron Mark II's stage coupler/engine block ["thrust ring," in 'Quest-speak'] showed almost no wear even after numerous flights).
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  #113  
Old 04-19-2018, 10:56 AM
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Quote:
Originally Posted by ghrocketman
Why would anyone use a D10 or D21 in anything BT-20 or 50 based rocket unless it is a fire-and-forget flight ? Not likely to get it back unless the field is huge.


GH,

A "kid" I know and her dad have both used the D10 to great effect in minimum diameter tubes for altitude record attempts.

But in 18 mm tubes they usually destroy the tube after a single flight. I wouldn't fly them in anything painted.

I DO find the D21 a great motor for the Semroc Mars Lander.

Last edited by Gus : 04-19-2018 at 11:51 AM.
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  #114  
Old 04-19-2018, 11:08 AM
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Gus-
I can see that D10 being put to great use for that purpose ! I can imagine who the "kid" and parent are....
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  #115  
Old 04-19-2018, 11:44 AM
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....I probably can, too....
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  #116  
Old 04-19-2018, 01:06 PM
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Jerry Irvine Jerry Irvine is offline
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Default Kits suitable for the new motors

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Last edited by Jerry Irvine : 04-19-2018 at 01:25 PM.
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  #117  
Old 04-19-2018, 02:52 PM
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Quote:
Originally Posted by Gus
GH,

A "kid" I know and her dad have both used the D10 to great effect in minimum diameter tubes for altitude record attempts.

But in 18 mm tubes they usually destroy the tube after a single flight. I wouldn't fly them in anything painted.

I DO find the D21 a great motor for the Semroc Mars Lander.


I've flown a Discount Rocketry Tube-Oh with a D21, TWICE and gotten it back. There was a little discoloration on the tube following the second flight.

I've flown one of the Estes E2X rockets on D21, TWICE! and gotten it back (though the first time was a bit dicey... it just managed to find the side of a road in a forest next to the launch site. Just dropped right in between two large stands of trees.). I expected the motor mount to melt a little, but it survived nicely.
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  #118  
Old 04-20-2018, 09:22 AM
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I've had good luck rolling up a sheet of cardstock and inserting it down the body tube to protect them from charring with some of the little 22mm EX motors we played with. YMMV. Those little 22mm F motors were bullets!

We didn't use coupler tubes because of the recovery systems and they would have been hard to remove after getting roasted too. They wouldn't last but a few flights anyway, so it's not a permanent solution.
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  #119  
Old 04-20-2018, 11:57 AM
BARGeezer BARGeezer is offline
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Hmmm... I'm wondering if Nomex paper would work better than cardstock or coupler tubes:

http://www.erockets.biz/semroc-nome...d-sem-nom-2436/

Possibly a longer lasting solution? Worth further exploration.
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  #120  
Old 04-20-2018, 02:31 PM
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I doubt thin nomex paper would be better than a thick fish paper stage coupler for burn-thru protection.
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