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AFAIK, all Pro75’s fit in the equivalent AT hardware…

What CTI M can Art use in the 1297 casing (75/5120)?

AFAIK, all Pro75’s fit in the equivalent AT hardware, and that might be true about Pro98 as well (not quite as sure there). So, buy AT hardware for 75mm, and then you can fly both Pro75 and AT loads in…   Read more»

Pro all the way!Tim, we talked about the price of AT RMS casings and reloads, we should talk about CTI and compare costs. You showed me the EASE of using Cesaroni… I don’t want to head off in the wrong…   Read more»

Pro all the way!Tim, we talked about the price of AT RMS casings and reloads, we should talk about CTI and compare costs. You showed me the EASE of using Cesaroni… I don’t want to head off in the wrong…   Read more»

The motor mount is only long enough for the M1297W. Gotta save weight!Art

8) For my 2 cents worth, in a 1-2-3 world, I would go I540, K660 or L730, and finish with a lovely M1400. Pro all the way! 8)

Note that I was stating that in the case of the rocket having safe thrust off the pad, which in this case both motors do, then the total impulse should be the next thing looked at. Obviously, if the motor…   Read more»

Total/average Newton Seconds are not always everything.. Ive seen PLENTY of smaller motors with less total Newtons out lift larger ones. Its all dependant upon when they use those newtons up. The I405 Happens to do it hard and fast.(the…   Read more»

Total/average Newton Seconds are not always everything.. Ive seen PLENTY of smaller motors with less total Newtons out lift larger ones. Its all dependant upon when they use those newtons up. The I405 Happens to do it hard and fast.(the…   Read more»

I think that it will have to be the Cesaroni I540 White Thunder. Looking at the TMT certification list, it shows the I600 with only 597.3 Ns and the I540 is at 635 Ns. I had considered some of the…   Read more»

Total/average Newton Seconds are not always everything.. Ive seen PLENTY of smaller motors with less total Newtons out lift larger ones. Its all dependant upon when they use those newtons up. The I405 Happens to do it hard and fast.(the…   Read more»

Definitely – the I405 is awesome, but it might not get the rocket high enough in this case. It’s only around 500Ns, though it kicks about as hard as the I600.

Personnally I would recomend the CTI as I agree with John in that it is a much easier faster lighting motor. Easier assembly and clean up as well as I belive the hardware is lighter to. Both are roughly the…   Read more»

I would lean towards the I600 – incredible motor, lots and lots of punch, and a little cheaper than the CTI load. It’ll get your rocket up and moving just fine. Of course, the CTI is awesome too – both…   Read more»

Art, the CTI load will light cleaner and if nothing else, it will be easier to clean the casing. Loading it will also be a *lot* faster.I personally make every effort to fly loads other than AT for reasons that…   Read more»

They tear about 1/4 to 1/2″ where the bottom of the fin joins the body tube.

Where are they breaking? Is it at the point where the fin meets the tube or a tip of a fin?

Thanks for the advice guys. To respond to a few comments, I don’t think I’ll build any more Q-tube kits, glassing is so easy and gives such a nice finish plus the added durability it just makes sense to go…   Read more»

Go with the thicker fins. I always regretted building that Endeavor with those thin fins.Art

My preference would be to go with the thicker fins. However, the strength REALLY does depend on many different factors including, like Warren pointed out, the tubing you are using and more directly, how well of a glue joint you…   Read more»