Activity

I’ve looked at too many sims not to know that keeping a rocket subsonic is almost always best, unless you blast thru in a hurry. Thats where IMO F and G records seem to behave odd and a 29mm slowburner…   Read more»

The other crux is that the G55, in an optimized rocket, will be at minimum in the transonic if not the supersonic, while the G25 will not. That is also a major change in drag. Which one is the greater…   Read more»

I have sims with the G55 that push slightly past 10K and reliably sim in the mid 9K range. The crux is that your G motor is 29mm whereas the G55 is a 24mm motor – a major change in…   Read more»

It still won’t touch a 24mm G55… which I will be flying before December 31st when it goes out of certification.WarrenFrom all my sims, it more than touches it, it well surpasses it with a well optimized rocket. I’ve never…   Read more»

me too. The closest animal extant is the Ellis 24mm SU G37 which has a tad over 110N-s but a longer burn, making it a near replacement for the vaunted G55.

It still won’t touch a 24mm G55… which I will be flying before December 31st when it goes out of certification.Warren

Most E-matches on the market today have an all fire current in the range of 500mA or less, with somewhere around 1 ohm resistance. It should fire pretty easily.By the way, Adrian, if you do design your altimeter to deploy,…   Read more»

Adrian,The specs on the M-Tek ematches that Tim carries are at:http://www.electricmatch.com/product.htmlI bought a handful to do ground testing. I also ordered some filament canisters from Pratt Hobbies (similar to Quickburst’s Hot Coils, but tested with “normal” altimeters).Ken

By the way Adrian, put me down for one of those altimeters when you’ve got one that will do at least Apogee deployment. Without electronic deployment, you really can’t optimize for altitude.Grr. Bill, you got me thinking, which is a…   Read more»

I bought it. It’s a standard module, runs on 3-6 VDC and provides 250 mW of output power. It’s made in the UK for long range remote controls and supports a bit rate up to 128Kbaud. Since it has CMOS…   Read more»

Warren,Man that is small. Was that off the shelf, or did you build it?Gregs stuff can be flown on 3v or so which means a three stack of those wee 50mAH NiCds will power it for some time, and easily…   Read more»

I’d be interested in seeing that if you could bring it to the next launch.I could drive they keying with the spare switched output on the Parrot, but then it wouldn’t be a factory-standard altimeter. I would also have trouble…   Read more»

I have a 433mhz transmitter module that will fit in a 13mm tube. The problem then becomes the battery and keying module necessary to make the beeps. It’s not GPS, but it will provide RDF type tracking.Warren

Adrian,Not sure who that might have been. With your electronic talents, simple matter of finding a schematic on line and making it even smaller if not small enuf. I assume you have a HAM lisence. . I’m happy that the…   Read more»

As to the 90 percent point, (at least with F and above) I would have to opine that would be sometime during descent after the recovery device has deployed and someone has seen it recently or they have a radio…   Read more»

Yea, there’s a minor beef I have and one of the reasons some of the staged records strike me as more inviting–IMHO any record that flew on a now legacy motor should be retired at the time the motor becomes…   Read more»

The J impulse TRA record is just nuts. I passed the old record a year ago, but not by 2%. By the time I had another crack at it, the record went from ~16,700′ to almost 20,000′. On a perfect…   Read more»

Warren,all i know is what Rocksim tells me. I assumed for a long time that the extra area (approx 30/25^2=36/25, or roughly 45percent more would make such a venture out of the question. Then when the motors were certified for…   Read more»

An F motor bird, done 29mm for the Apogee F10, doesn’t stand a chance against a 24mm motor. The additional diameter and concomitant increase in drag overcomes the longer burn and will make it quite difficult to fly much over…   Read more»

Adrian_A wrote: . and fun spirit of competition we have going here.Well first settle for the A through F records. The Apogee medalist motors –well, the E6 and the F10, anyway– have versions with long enough delays to do some…   Read more»