Need some help with rocket design

[kandsrockets]

I am new to using Rocksim and was wondering if someone that uses it can look at the design file below and let me know if this thing is going to fly.. The design is 4 29mm G motors. I have a few flight test with different G motors. Any comments or suggestions would greatly be appriciated.

Thanks
Scott

 

[kandsrockets]

Okay I was playing around this evening with my design and here is what I have come up with. Comments and advice please. I am looking at using this for my level 1 testing.

Thanks
Scott

 

[cjl]

Looks nice, though I'd call that weight a bit optimistic. I would stick with a simpler design for L1 however. Single motor, slightly smaller. Fly this thing after you have the L1.

 

[kandsrockets]

Originally posted by cjl
Looks nice, though I'd call that weight a bit optimistic. I would stick with a simpler design for L1 however. Single motor, slightly smaller. Fly this thing after you have the L1.

Well since everybody says no on the multi motor for level 1 testing how about this one then. It is a single 29mm motor 6' long and 4" dia. Let me know what you think.

Thanks
Scott

 

[cjl]

Well, again I would argue that that weight is optimistic - my bet is that it would actually end up in the 3-4lb range, if not slightly more, and I would go for a 38mm if you want single motor - 29 is rather limiting in a rocket of that size. Other than that, it should be pretty good.

 

[kandsrockets]

Originally posted by cjl
Well, again I would argue that that weight is optimistic - my bet is that it would actually end up in the 3-4lb range, if not slightly more, and I would go for a 38mm if you want single motor - 29 is rather limiting in a rocket of that size. Other than that, it should be pretty good.

Thanks cjl, I am figuring it will be closer to 7 pounds being that the tubes will be fiberglassed and the fins will be fiberglassed tip to tip. I will change the motor mount to a 38mm. I had also thought about going to 54mm motor mount then I might be able to use it for level 2 testing in the future.

 

[cjl]

Hey - I'd be all for a 54 if you think it'll weigh that much. A 29 would struggle to lift something that heavy. 54's are wonderful - go for it

If it's glassed, it'd have no trouble taking it.

 

[kandsrockets]

Thanks cjl. Now I have to put my parts list together and get things ordered so I can get this built for May.


Thanks
Scott

 

[Nate]

JUST a 54?

wimp....

 

[jadebox]

Originally posted by cjl
Hey - I'd be all for a 54 if you think it'll weigh that much. A 29 would struggle to lift something that heavy. 54's are wonderful - go for it

I fly a couple of rockets about that heavy on 29mm H and I motors all the time.

The combo is great for a certification flight - you definitely don't have to worry about it going too high.

But .... that doesn't mean the OP shouldn't build the rocket with a larger motor mount. I built my EZI-65 with a 54mm motor mount, but used a 54-39mm adapter in it for my Level 1 certification flight.

-- Roger

 

[kandsrockets]

I am going to put a 54mm motor mount it and use a adapter to use smaller motor housings. I figure this way when I am ready for level 2 I will mod this rocket to work with the bigger motors.

Again thanks for all the info and help.
Scott

 

[cjl]

Originally posted by Nate
JUST a 54?

wimp....

Hey - it's his L1 cert rocket.

The 98mm MD comes next

 

[kandsrockets]

Ordered all the parts today to build my level 1 test rocket. Now I need to get the work bench cleaned off and ready for the new build.