Cirrus Dart

[Sparky2Participant]

What is the club altitude record for this rocket? Anybody use a J motor and still recover it?

[Anonymous]

John, we don’t keep club records by rocket or by design… we keep them by impulse class. The club J record is a snitch over 17K. That was on a J570, and it was recovered intact.

[Warren B. MusselmanModerator]

I had a Cirrus Dart that flew over 12K and Chris LaPanse flew his on an I motor to 13K or so.

Warren

[SCOTT EVANS]

I had a Cirrus Dart that flew over 12K and Chris LaPanse flew his on an I motor to 13K or so.

Warren

Seams kinda high for an I. Been playing with rock sim in anticipation for the SSSS. Cant even get 13 with my dart on a J350. 😯

Scotte

[Ed Dawson]

I did about 12.3K with my “slightly” modified Cirrus Dart on a J350. And that was with twist and tuck wires sticking out a little bit.

I’ll be trying again this summer….

[SCOTT EVANS]

MrEd wrote:

I did about 12.3K with my “slightly” modified Cirrus Dart on a J350. And that was with twist and tuck wires sticking out a little bit.

I’ll be trying again this summer….[/quote

I got 12800 on the sim but that was reducing fin size and no lug.
sooooo- I guess for the ssss we can only use one J350 huh?
A few OZ. either way didnt seem to make much of a difference.
I’ll make sure to wet sand out the Orange Peal in the paint with 600-800 and buff it to a glass smooth surface. Launch on a Hot day when Air density is low. 😉 Maybe Lubricate the tower……
🙄

[Warren B. MusselmanModerator]

I may be mis-remembering things. Perhaps Chris only did 11K+ on his I600. On checking my flight records, my flight was on a 5 grain Cesaroni J285, not an I.

Warren

[Anonymous]

IIRC Chris did just under 12K – he flew it with one of Adrian’s Parrots. He was flying the I600, I believe.

I flew an I132 to 12,136′. I sure wish I had used that motor in an optimized bird 😯 I put it into a rocket that was too long, wrong shape nosecone, too heavy, etc. The AeroTech plant burned down about that time, and I never saw another I132. I wasted mine. Drat. I’m sure I could have gotten over 13K with that load.

The I132 was a very full I, and it was a 38mm SU motor. What a dream altitude motor…

JW

[AdrianParticipant]

His Cirrus Dart went about 11,950′. There was very little wind, he launched from a tower and it was plenty hot. Also note that he used an electronic timer for deployment; this rocket and motor combination would likely shred with motor ejection.

http://www.rocketryforum.com/showthread.php?t=37915

I also link to it from http://www.featherweightaltimeters.com as example data.

[Chris LaPanse]

Yep – 11,950. It was an absolutely gorgeous flight, and the flame out of the I600 was probably as long as the rocket. I also got incredibly lucky with the wind – it would have been incredibly easy for that rocket to vanish and never be seen again given the altitude. As previously said, mine was launched from a tower, and it also had a glass-smooth finish (auto paint). Peak velocity was ~1200mph (M1.7ish). Exterior was stock, though the nosecone was a PR glass cone (saved a LOT of weight), and I flew it without the piston (so I could fit the non-stock recovery harness and chute). Flight weight was ~15oz with everything but motor, and the motor weighed almost 22oz – the heaviest motor with relation to the rocket that I have ever flown 😀

As Adrian said, I used a small timer (actually, the EFC) for the flight, as the optimal delay was around 22 seconds.

[Author]

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