Now that you have that out of the way, when can I get the 75mm M2700 on order? :-D
Thanks, we'll get that fixed.I highlighted a couple of spelling errors you might want to fix before sending that to any magazines.
That was a long time ago, Tom.Nope. No-0. Not the same. Rack rockets with B14s were a lot of fun especially when motors were <$.50 each
H13 has <125g of propellant, H14 has >125g of propellant. FAA Class 1 vs Class 2.I was curious why Aerotech has both the H13ST and H14ST, since they are both long burn motors and are so similar in specs. Specifically, I purpose designed some rockets for the H13ST that sim OK with it and sim as UNSAFE with the H14ST (longer burn, lower initial thrust - the initial thrust peak is so short it makes a significant difference in the sim results). I was a bit concerned that the H14ST was replacing the H13ST, but the response from Aerotech was they are both production motors and that the H14ST was a purpose designed motor. Since I had to design said rockets as light as possible for the H13ST (and I still need very calm winds to fly them), what would the purpose design of the H14ST be?
Let the cogitating begin. Aerotech, wait a bit to respond so we can ruminate on this for a bit and develop a few wild and crazy ideas.
H13ST View attachment 653952 H14ST View attachment 653953
H13 has <125g of propellant, H14 has >125g of propellant. FAA Class 1 vs Class 2.
that the H14ST was a purpose designed motor.
With a purpose-designed rocket built around it, the H14 should be able to achieve significantly higher apogee in the "H altitude" wars.
"The new H14ST-P DMS high-power rocket motor was designed by Gary Rosenfield, RCS/AeroTech founder and president, after developing the H13ST-P for the Hamster Dance competition at Black Rock Desert, NV during the BALLS-28 launch. The new H14ST-P is capable of reaching altitudes over 20,000 feet with an 18.3 second burn time. This low-thrust, long burn high-power hobby rocket motor has the highest total-impulse of any 29mm long burn high-power rocket motor available."Humm.. Did Gary design it for a Hamster Dance Launch ?
I think the main reason why the H14 exists is because Gary thought it would be cool. Also maybe because it can theoretically push the H record above 20k feet.Since I had to design said rockets as light as possible for the H13ST (and I still need very calm winds to fly them), what would the purpose design of the H14ST be?
No timeline yet. Catching up with orders first.Curious also as I have a message in to Ian ... When will you release the 75/M2700 for purchase? Thank you for you time
I think the main reason why the H14 exists is because Gary thought it would be cool. Also maybe because it can theoretically push the H record above 20k feet.
That was mine, I am almost 100% certain the issue was the ignition method.
In the past I have flown the rocket on 3 x K695's, and it was suggested I use pyrodex to ensure all three motors ignite quickly to be sure the rocket was moving fast enough when it left the launch rail. This advice has worked great for multiple flights on K695's. Some discussions on the field after this years failure make me think I should not have applied this advice to the more aggressive propellant in the K1100's.
I respectfully disagree. I think lack of grain bonding is the root cause of these CATO's. That's just my .02, take it for what its worth. I've clustered (3) K-1100's and (3) K-2050's using the Pyrodex method successfully. Care to guess if the grains were bonded into the liners?
That is interesting. I've flown a decent number of K1100s in the past without grain bonding and never had an issue. It seems odd to me that 3 would suddenly fail for that reason when I haven't had one fail in the past. But I can't blame the pyrodex since you have clearly used that method without issue.
I am curious, why would you want to use pyrodex with blue thunder anyway, it's already a very easy to ignite propellant. Its one of the reasons I collect grains from catoed BT motors, to use as igniter boosters.
- I have been using pyrodex epoxied to my smoke grains (like Justin showed in his picture) for years (although, I admit, I only use a half grain for 38mm and 54mm motors
There are several sizes of Pyrodex pellets. What size do you normally use for 38mm before cutting it in half?
Agree with others. Great article and positive press coverage. Nicely done and best wishes for the future!
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