Doug Gerrard

Thanks everyone. I’m not that familar with other brands other than Aerotech. I’ve used AMW on a few occasions when Jim was still renting. The guy I borrowed it from says Tim is suppose to send him one (it was…   Read more»

It does fit in a liner but the washer goes between the nozzle and the snap ring. I estimate a 2.75″ OD and about 2″ ID and about 1/4″ thick. I think it distributes the load to the graphite nozzle….   Read more»

You’re wecome to use mine after my flight(s). I plan on doing mine on Friday but it will depend on the weather.Doug

Never tried it with HPR igniters, but it should work the same way as the estes.I would never make that assumption and I rarely use the word never. If there is one thing I’ve learned it is that what works…   Read more»

simultaneous ignition probably depends more on other factors than series v parallel such as the propellant type, igniter pyrogen type, placement, etc assuming one has a decent set up and batteriesI agree. One side aspect I wanted to do with…   Read more»

I too had heard the auguments for using series e-matches and in fact I have tried doing it. For those of you who will be around Friday evening I have some close ups of motor ignition with the high speed…   Read more»

Start by throwing the lug away and switch to rail buttons Seriously, the issue isn’t so much length as distance between the two rail guides / launch lugs. For a rocket that size, don’t just use one. One rail…   Read more»

I’m just guessing too and I rarely use motor ejection anymore. It just seems like anytime the delay exceeds about 10 or 12 seconds, the uncertainities compund to the effect that using motor ejection is just too unreliable.

So yes for lower/mid High power motor flyers sure. 38mm and under you bet. H, I and small J like J350. But those allready have delays and ejection charge capable. to me what is in place allreay works well for…   Read more»

I was at LDRS next to Aerotech and they were demonstrating their new products. In particular ws a nifty littly device that was an electronic delay element. It screwed onto the forward end of the motor and was programmable from…   Read more»

Sounds like a good plan. For redundancy you can use the two electric matches going into the same charge. If you want to have separate charges for each unit, you can program the MC to fire 1 sec after apogee…   Read more»

I have a G-Whiz MC high G that is rated for 100 g’s. The components are coated in epoxy and perhaps a different accelerometer. Check outhttp://www.gwiz-partners.com/html/g-wiz_mc2.html

The only thing I can contribute it to is either (1) it never got powered up or (2) it couldn’t satisfy its requirements to continue. My understanding is if you tell it a particular configuration and it doesn’t see it,…   Read more»

I really try to avoid posting negative comments but I do have to inform you that “Control” failed to work on my 2 stage rocket and all was completedly lost. This is the same rocket I flew successfull at the…   Read more»

Kyle,For what its worth, BDCR stands for Big Dumb Camera Rocket because I was in the same delima. It was orginally BDR until I added the camera. I’m sure when you show up with it we’ll call it all kinds…   Read more»

I guess us non-club members are on our own Doug