[AR] Re: 10km (30k feet) with a K300

  • From: Raum <Rocketry101@xxxxxxxxxxx>
  • To: arocket@xxxxxxxxxxxxx
  • Date: Wed, 5 Apr 2023 15:00:12 +0200

It goes at mach for 9 seconds, I tried to incorporate the boat tail and changed the fins a bit. Still got roughly 7500m, any recommendations? Thanks in advance.

On 4 Apr 2023, at 21:20, Ben Brockert <wikkit@xxxxxxxxx> wrote:
It’s a nose cone for supersonic flight, how much of the flight is supersonic? I don’t have the curves memorized, may be a silly question. If the 509 m/s is top speed a blunter nose might be better. 
Can you fashion some quantity of boat tail? Often the winners of altitude competitions with a given kit at HPR meets I’ve been to are ones who had “engine retainer”s whose purpose were perhaps not purely engine retaining. 

On Tuesday, April 4, 2023, Raum <Rocketry101@xxxxxxxxxxx> wrote:
Hi guys,
After testing my motors for a while I am going to try 10km with a k (roughly 1400Ns, 600Ns average thrust). I saw a couple of records on the Tripoli website with K250 and K300 motors close and above 30k feet. The problem I have is that I can’t seem to get open rocket show me the magic number. Do you guys see any improvements I can make (I only wanted to reach the altitude that’s why I haven’t included the altimeters and parachutes)?<Screenshot 2023-04-04 at 21.07.46.png>

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