markkoelsch
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- Mar 18, 2009
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I think you need a further thought on that battery from a retention standpoint.
I think you need a further thought on that battery from a retention standpoint.
On an i600r under thrust, that battery weighs several somethings. Same story on any kind of chute anomaly or unplanned geological excursion.
Good luck Kyle,
I see that you have made some thoughtful modifications. Keep in mind if you sand the Proline 4500 it will turn from shiny black to an unfinished grey look, not a big deal but it just looks different than what you might expect. I cannot recall if you have a min diam retainer on this, if so here is one thing that happened to me last year and a new practice you may consider adopting.
I launched my Tomach on a k830 to 16K, on apogee my main deployed (I did a post flight analysis and made some changes to mitigate this). When I recovered the rocket, 3.5 miles away in the middle of a farmers 8' corn field, I noticed that my motor was about a 1/4 turn from falling out. It was completely screwed in and tight however the ride down from 16k over 3.5 must have been rough.
So now I add some blue loctite to the screw adapter before I put it in the retainer. This provides enough resistance and is easy to unscrew and cleanup as my retainer is removable.
But when that load is coming unexpectedly on multiple axes?
A battery jarring loose is the number one reason DD flights fail. Or maybe it's loose wiring. Either way, I'd DEFINITELY do something with that battery. Do not count on just the Velcro.
SUCCESS!!!!!!!!
I had a long narrative written out, but my browser crashed and I don't feel like rewriting it all right now, so I'll just put up some pics and video for now. I'll also say that the flight was a perfect flight with a max altitude of 24,258ft according to the TeleGPS.
Thanks!Wow Kyle, nice! You look like you have quite the launch facilities, is that a bunker? BTW how far did she land from the pad?
Thanks!
Yes that is a bunker. The Friends Of Amateur Rocketry site is used to test homemade liquid fueled motors, college team motors, etc., so they have bunkers, a machine shop, multiple test stands, and assembly buildings. It is an awesome place to be. It is also where Mythbusters filmed some of their rocket myths.
The rocket landed 4.2km from the pad, but we were able to go drive down a road so we only had to walk about 1200m to go get it.
You will have to build a new rocket as an M won't fit in your Tomach anyway. Although Loki is apparently coming out with a baby M for their 54/4000 case, which I just happened to have. Problem is the case is 43" long so it won't fit in my Tomach either, so I will be building something custom, but not for the baby M. It will be for the L-2050 as I may take a shot at the Tripoli L single-stage commercial motor record.
Provided the cg was ok, is there any reason a motor couldn't stick out the back of a MD rocket?
BTW I am interested in what you are planning for your L3? After your L1 and L2 certs there is no way you are sticking a baby M in a big rocket launching it to 3,000 feet, just to watch it float down and call it a day.
No, but you'll need a thrust block or to mount a thrust ring further up on the casing if you intentionally use the protruding motor as a coupler.
A battery jarring loose is the number one reason DD flights fail. Or maybe it's loose wiring. Either way, I'd DEFINITELY do something with that battery.
Well don't make statements like "batteries are the leading cause of DD failure" then
Ok. Batteries are important. Please secure with more than just Velcro. Better?
I concur. And that battery had the Velcro and also had tape wrapped around it and the sled. It wasn't going anywhere.
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