Chris LaPanse

That’s the L1115 IIRC. The M is the M1400, which fits in the AT 6400 case.

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»

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»

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.

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»

8) Loki has an L1400. 2850nt. in 2 seconds! Holy Crap, I want one!!!! Big 54/ 2800 case. There is that big Ellis L. AMW has 2, 54/2500case, a L1300BB and L1110RR, I am sure their are more…. 8)Yep -…   Read more»

Today was quite a bust for me on that front, though. Using the same design techniques, and the same stability margin (0.8-1.0 caliber, RockSim) as I had on that nice, straight E shot last month, two rockets I was trying…   Read more»

Well, considering that there was a wonderful spot known as lake pawnee about half a mile southeast of the pads today, I seriously doubt that it will be too dry for skids (though a lot can change in a month…   Read more»

That sucks :(Just make sure to get better in time for Oktoberfest – we can’t have you missing that 😉

I went back to the altimeter data from my “Just Do It” flight.The descent rate under the RRQS70 main was right at 20fps for a rocket that would have weighed 38 lbs 6ounces after propellant burnout. Ed, that matches my…   Read more»

I have never measured the descent rate on the 15, no. My 50 however comes in at about 9-15fps with 29lbs of load at the north site. The 15, assuming similar drag characteristics, should come down even similarly with 9lbs….   Read more»

A Rocket Rage RRQS15 would be idealMike, you should greatly oversize your Rocket Rage chute if you like your rocket to land softly. The RRQS15 will bring it down but more on the 25 fps rate. I have a RRQS30…   Read more»

Keep in mind that area, not diameter, is what matters. So, a 72″ would be the equivalent of 4 36’s, not 2. I also agree that a single 60 sounds a bit small – I would go with a 72…   Read more»

4 inches?Holy crap – someone was doing an effective rain dance…

Well, considering that the frontal area goes up by the diameter squared, a 7.5″ rocket will have more than triple the drag of a 4″ rocket at the same speed, assuming similar coefficients of drag. You’re right that this can…   Read more»

It depends a lot on the rocket’s diameter and drag…19.5lbs isn’t that much for an M (30lbs with motor and all), but as you say, it is only a baby M. On a typical rocket, I would probably expect 8-10k,…   Read more»

They definitely shouldn’t be that far off.I have used rocksim with great success many times, and trust it for reasonably accurate simulations. However, it is only as good as what you enter into it. Check and make sure everything is…   Read more»

Very true. The reason for that offer was simply if a LEUP holding adult were to come too. The laptop + DVD idea is a really good one though – I have several nice LDRS and NCR DVD’s and such…   Read more»

I know about that – the only way anything over 62.5g would be tested would be if there was a LEUP holding adult there. Otherwise, it would be a G64 or so (I have a few of those lying around)….   Read more»