new2hpr

I'd keep it as is, and just go bigger than you'd normally go with the main chute.  I've broken a fin on 3 of the last five rockets I've launched, so I need to learn more on this as well.IF…   Read more»

Like Mike, I have only removed the cardboard plug and emptied the powder.  I haven't had any issue with pressure.  My outboard airstart motors have only a few cubic inches of airspace in front of them (sealed, no venting) and…   Read more»

Throw it into Rocksim or OpenRocket and check velocity off the rail.  Also very handy for figuring out timing for airstarts.-Ken

I've always been concerned that the starter (ematch, igniter, or whatever) would open upon firing, like every Estes igniter I've used, so parallel is what I will continue to use.As an EE, I have to question whoever wrote up the…   Read more»

Exactly.

Most has already been covered above.  I wouldn't bother with any additional pyrogen dip for CTI motors.  I've lit clusters of them on the ground and in the air (3 38mm CTI's started with a Perfectflite minitimer and 9V battery)…   Read more»

Give me a call, and we can meet up.  I'm in SW Longmont, work in Boulder.(303) 870-6747 (cell)-Ken

sold.

sold.

Edward and Ed,I paid $100 each for these.  They've never been flown (or been on a dog!).  What would you give for them?All my L1 level rockets are in need of repair, and my L2 PR Competitor 3 hasn't even…   Read more»

Unless you're hammering it with a really fast motor, you should be fine.  The laundry is porous, and you just need to bleed out enough air so the differential pressure shift doesn't pop off the nose early.  I usually put…   Read more»

Now THAT’s got some serious long-burn BP motors!!!Probably not NAR/TRA certified, though :(-KenHere’s another one. Smaller, but with onboard GoPro!https://www.youtube.com/watch?v=Cuh143TIzd0

Geoff,Mike has filled you in on just about everything. For MOST altimeters, you need to use a low current initiator like an e-match or a Quest Q2G2 igniter (if you can find them!).Always ground test before a first electronic deployment…   Read more»

I wouldn’t use a pool noodle unless I had an 8″ airframe or bigger! Best would be to wrap it with a kevlar sock, but I suppose duct tape would last OK for a flight or 2.My charge for drogue…   Read more»

I’ve used the fireball on multiple flights. It won’t guarantee against a zipper, but it helps.On my last non-electronic deployment HPR flight, I had an early ejection that blew out the laundry at speed. The fireball never made it to…   Read more»

Was the foam in your nosecone the cheap stuff out of the spray can, or the 2-part epoxy foam sold in hobby stores, etc.?The stuff out of the spray can requires contact with air to cure, and can remain gooey…   Read more»

McGuckins has them, but obviously you’ll pay! It IS McGuckins after all.If you’ve got other stuff to get, it might be worth it to do a McMaster-Carr order.-Ken

Steal of a deal, Greg, but I don’t fly enough to justify more stuff at the moment.If you don’t get bites, put it up on TRF. They’ll buy ANYTHING!-Ken

Looks awesome!What day? What motor?Looks to be 4″ min dia.Details, man!-Ken

Weather update from some of my field crew who are installing one of our environmental monitoring towers about 7.5 miles SW of the North Site: They aborted work because of snow, up to 7′ high drifts in places. I hope…   Read more»