L1 trigger pullled. Madcow Rocketry 4.0" Patriot

[mjstech]

Hey all,
I just ordered my L1/L2 rocket, a retainer, and 54mm-38mm adapter.




This rocket will be for my L1 cert. I hope to have it completed by April 24/25 so I can fly at our group's Spring Blast in Rainbow Valley, AZ.
I am wondering if I should get the 4.0" Altimeter bay at the same time if I decide to turn this into a L2 rocket. (This is also why I'm getting it with a 54mm mount)


What modifications would I need to do to include the bay, but keep the rocket the original length?
Can I fly it with the Altimeter bay installed (minus altimeter) and still use motor ejection? I would want to do it this way for my L1 attempt. I am thinking of keeping the K.I.S.S. method.I am planning a first flight with a
38mm H123. Maybe larger, I don't know.

I will keep a running build log of this rocket as soon as it comes in.
If you have any tips, information, or recommendations please let me know.

Mark

[Bill P]

Yes, you might as well order the e-bay at the say time. That'll give you time to get comfortable with electronics for when you go for your L2.

The AeroPack retainers are great, you'll love them. Once you go AeroPack, you'll never go back.

The 4" Patriot should be a good flier for both level attempts.

[Mikus]

That's what I used to get my L1 cert. I didn't get the 54mm mount though and flew it without an ebay on an H123. The H123 puts it up about 1000', so everything should be nice, low and slow right there in front of you.

The only mod I did was to add a 3rd centering just forward of the fin tabs. It could use a tad bit bigger parachute than whatever comes stock.

Good luck.

[Slick36]

I used this and and H for my L1 cert. No need for electronics, Rocksim says it went to 1200 feet, landed nice and soft on the stock parachute. There's a picture of it in Sport Rocketry, the NSL 2009 issue.

[UPscaler]

Actually, you may not even need an ebay. You can use AT or CTI 38mm J motors to certify L2. Looks like you'll be hitting roughly 2500 on a J350. Not a problem for a 4 inch kit

[Handeman]

I am wondering if I should get the 4.0" Altimeter bay at the same time if I decide to turn this into a L2 rocket. (This is also why I'm getting it with a 54mm mount)
What modifications would I need to do to include the bay, but keep the rocket the original length?
Can I fly it with the Altimeter bay installed (minus altimeter) and still use motor ejection? I would want to do it this way for my L1 attempt. I am thinking of keeping the K.I.S.S. method.I am planning a first flight with a
38mm H123. Maybe larger, I don't know.
Mark

Get the alt-bay for it, even if you don't use it for your L2. With the 54mm MMT, you'll fly it L2 sooner or later.

There's two basic ways you can go on the alt-bay. Attach the upper tube to the bay and drill your ports at the joint between the two tubes. Or, cut a 0.5 to 1" piece from one of the tubes and glue that to the center of the alt-bay. Drill your ports through the center piece.

If you have enough room in the lower bay for the main chute you can certainly use motor ejection without the electronics. I would suggest putting the electronics in anyway, even if it's just to read the altitude.

You could go with a 54mm motor for your L1, then you would have the closures already and just need the tube for L2 motors. You could use the 54/426 and an I115W. Even built at the stock 32oz. it should only get about 2,500 ft.

[Quaranta]

I'd like to get a MC 4" patriot, to get my Level 1. But would also like to be able to fly it on my local field which is G-ltd. Will this rocket fly on a G?

would use with 38:29 adapter.

Thoughts?

[Handeman]

I'd like to get a MC 4" patriot, to get my Level 1. But would also like to be able to fly it on my local field which is G-ltd. Will this rocket fly on a G?

would use with 38:29 adapter.

Thoughts?

If the finished weight is below about 48 ounces, it should fly on large G motors. If you keep it down around the stated 32 ounces, it should even do 500 ft on a F52T-5

[Quaranta]

If the finished weight is below about 48 ounces, it should fly on large G motors. If you keep it down around the stated 32 ounces, it should even do 500 ft on a F52T-5

Thanks. I'm pretty good at building light. Based on prev posts, I'm aiming for 44-48oz.

[crossfire]

I have the MC fiberglass Patriot.It flys great on the CTI 1 grain 54s.
gp

[Mick2b]

I am converting my Patriot to dual deploy, it flew great on an H180. A guy at my club used the stock 38mm motor with a J381 SK and it did very well, faster than a speeding bullet but he single deployed it at 3800 feet or so and got it back fine. The kit will work for both levels.