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Model Forum / General / Rockets / April 2005Nose mounted altimeters???
Hi all.. I've run out of internal space on one of my projects.....As a result it will be limited to single deployment. May be able to use dual but with no drogue chute.....Just separated airframes??? I don't want to alter it's length if possible so I have to mount the altimeter and ejection canister etc. in the nose to separate the fin can & rear deploy chute.. Never done this before so if you could point me to some good links of a similar set up that'd be great! Cheers, Clint. My Yank Mystic Buzz. 3 inch kit. http://oberon.ark.com/~lkvend/rocket.html I've since modified this nose cone to use a Dual Deploy Altimeter. I added small terminal blocks for the charges to the nose cone base. The vent hole goes though the nose cone shoulder and on thought the airframe about an inch from the edge. I also use a shear pin to make sure the holes stay correctly aligned. My battery and altimeter are mounted to a thin board in the BT55 tube with a combination of foam and pipe insulation supporting it. It's a very small space with the hole directly aligned with the barosensor. An accelerometer based unit would need ridged support. Layne Rossi > Hi all.. > [quoted text clipped - 10 lines] > Cheers, > Clint. >I've since modified this nose cone to use a Dual Deploy Altimeter. I added >small terminal blocks for the charges to the nose cone base. The vent hole >goes though the nose cone shoulder and on thought the airframe about an inch >from the edge. I also use a shear pin to make sure the holes stay correctly >aligned. Have you had any problems with deployment? A friend of mine put her electronics bay close to the nosecone, and had the main parachute deploy while the motor was only halfway through its' burn. The only reason we could come up with for the failure was false triggering due to turbulence from the nosecone. > Have you had any problems with deployment? A friend of mine put > her electronics bay close to the nosecone, and had the main parachute > deploy while the motor was only halfway through its' burn. The only > reason we could come up with for the failure was false triggering due > to turbulence from the nosecone. Use mach delay or an accelerometer with the main lock out before apogee. I've only used this once with the altimeter. I flew it on an I287SS and I did use MACH delay. Layne >>I've since modified this nose cone to use a Dual Deploy Altimeter. I added >>small terminal blocks for the charges to the nose cone base. The vent hole [quoted text clipped - 9 lines] > reason we could come up with for the failure was false triggering due > to turbulence from the nosecone. Nice! Now I gotta pack it into a 2.15in. I'll have some pics of what I end up with........ Put up when finished. Thanks > My Yank Mystic Buzz. 3 inch kit. > http://oberon.ark.com/~lkvend/rocket.html [quoted text clipped - 26 lines] >> Cheers, >> Clint. > Hi all.. > [quoted text clipped - 7 lines] > Never done this before so if you could point me to some good links of > a similar set up that'd be great! Cant supply you any link, but my latest project has an altimeter within the space of the nosecone. For access to it, there are no hatches or external switches or anything like that, because the whole nosecone itself unscrews completely off its base, like the lid off a bottle. (the altimeter is mounted to the base, which stays on the rocket) I have the same situation; I am using the burrito / tether solution to still get dual deployment. You can see it here: http://www.defyg.com/rapid.pdf All you have to do is put the altimeter in the nosecone. To release the burrito, you can use a formal tether device, or you can use an ejection charge with a piece of fishing line running through it. -- David > Hi all.. > [quoted text clipped - 10 lines] > Cheers, > Clint. Is that along the same lines as the BlackSky ARRD2??? I've been looking at that for a no-split AF. Dual. Take a nice chunk out of my budget..... :-) >I have the same situation; I am using the burrito / tether solution to >still get dual deployment. You can see it here: [quoted text clipped - 19 lines] >> Cheers, >> Clint. Yes, except a lot cheaper. (but not as cheap as running a piece of fishing line through an ejection charge). -- David > Is that along the same lines as the BlackSky ARRD2??? > I've been looking at that for a no-split AF. Dual. [quoted text clipped - 24 lines] >>> Cheers, >>> Clint. > Hi all.. > [quoted text clipped - 7 lines] > Never done this before so if you could point me to some good links of a > similar set up that'd be great! http://www.bobarnott.com/rocketry/rockets/electric/index.shtml HTH  SignatureNiall Oswald ================================ http://www.bits.bris.ac.uk/niall UKRA 1345 EARS 1151 MARS |
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