Estes Prowler build

What's the exit velocity?

trying to force it to show 24mm engine options: (If you enter 29mm, it won't show any 24mm engines)

Rocket Name: Prowler
Body Diameter: 2.00in
Dry Weight: 9.5oz
MMT Diameter: 24.0mm
MMT Length: 5.00in
CD: 0.60

Motors That Work
These motors fit your rocket and appear to have enough thrust to lift it safely. If thrust curves are available, a quick simulation has been run to give a rough idea of the performance of your rocket on this motor. We encourage you to run a more complete simulation with any motor you plan to use; see the simulators page for more info.
Motor Weight Launch Velocity Accel Altitude Time Delay
OK Cesaroni E75 11.3oz 71ft/s 240ft/s 28.6G 606ft 5.8s 5s
OK Estes E30 11.2oz 53ft/s 299ft/s 14.8G 909ft 7.1s 6s
OK AeroTech E28 11.5oz 53ft/s 331ft/s 14.9G 1,077ft 7.6s 6s
OK AeroTech E30 11.2oz 53ft/s 337ft/s 14.5G 1,088ft 7.6s 6s
OK AeroTech F44 11.2oz 58ft/s 387ft/s 20.0G 1,152ft 7.7s 7s
OK AeroTech F62 12.6oz 58ft/s 394ft/s 19.4G 1,208ft 7.9s 7s
OK AeroTech F63 12.4oz 65ft/s 416ft/s 20.2G 1,287ft 8.0s 7s
OK AeroTech F24 11.7oz 48ft/s 339ft/s 11.7G 1,303ft 8.5s 6s
OK Cesaroni F51 12.1oz 58ft/s 408ft/s 18.8G 1,317ft 8.2s 7s
OK AeroTech F39 11.6oz 59ft/s 401ft/s 17.4G 1,344ft 8.3s 7s
warningsW AeroTech F51 12.4oz 63ft/s 425ft/s 19.8G 1,372ft 8.2s 7s
OK Cesaroni F70 12.1oz 68ft/s 450ft/s 27.4G 1,387ft 8.2s 7s
OK AeroTech F35 12.5oz 57ft/s 427ft/s 15.8G 1,499ft 8.7s 7s
OK AeroTech F32 11.8oz 57ft/s 427ft/s 17.0G 1,529ft 8.8s 7s

Motors That Fail
These motors fit your rocket, but failed one safety check or another. They may actually work, but you should use them only with caution. We encourage you to run a more complete simulation to verify flight safety; see the simulators page for more info.
Motor Reason
failedG Estes C11 speed at end of launch guide too slow (33ft/s)
failedG Estes D12 speed at end of launch guide too slow (39ft/s)
failedG Estes D11 speed at end of launch guide too slow (36ft/s)
failedG AeroTech D7 speed at end of launch guide too slow (23ft/s)
failedG AeroTech D9 speed at end of launch guide too slow (27ft/s)
failedG AeroTech D15 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni E22 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni E31 speed at end of launch guide too slow (43ft/s)
failedG Estes E12 speed at end of launch guide too slow (39ft/s)
failedG Estes E9 speed at end of launch guide too slow (29ft/s)
failedG AeroTech E7 speed at end of launch guide too slow (24ft/s)
failedG AeroTech E11 speed at end of launch guide too slow (31ft/s)
failedG AeroTech E12 speed at end of launch guide too slow (30ft/s)
failedG AeroTech E20 speed at end of launch guide too slow (46ft/s)
failedG AeroTech E18 speed at end of launch guide too slow (42ft/s)
failedG AeroTech E6 speed at end of launch guide too slow (24ft/s)
failedG Apogee E6 speed at end of launch guide too slow (32ft/s)
failedG AeroTech E15 speed at end of launch guide too slow (41ft/s)
failedG AeroTech F12 speed at end of launch guide too slow (36ft/s)
failedG AeroTech F30 speed at end of launch guide too slow (45ft/s)
G These simulations were run with a launch guide length of 3ft (rod, rail or tower). If this is not correct, launch guide lengths can be specified for your saved rockets. (The minimum velocity required is approximately 15m/s or 50ft/s.)

GlenP said:

Could a D12-3 get the Prowler high enough to safely deploy the chute, using the 24-29mm adapter:

https://www.estesrockets.com/rocket...essories/009753-24-mm-to-29-mm-engine-adapter

Recommended engines are E16-6, F15-6, F15-8. D12-5 might not be short enough delay for a lower flight, maybe?

Click to expand...

Wet, that rocket weights about 3 newtons (300g) That gives you a fairly low thrust to weight ratio of 4-1. Ideally you want that at 5-1 for a safe velocity off the rod. (Metric makes these calculations much more simple

You can probably get away with a D12-3 on a calm day with a 5 foot launch rod. With a shorter rod or any wind, use a higher thrust motor.

I've launched my E2X PSII Mammoth and Trajector with full-size Estes 24mm BP E motors many times. They work ok but keep a close eye on the wind speed - much more than light breeze is too windy. And like the last poster said at least a 5 ft launch rod. The 29mm motors work much better and the 29mm Es really don't go excessively high but the 24s do keep everything the rocket does in sight.

Also, in my experience, I find that the online simulator tends to be a bit too conservative about launch velocity. Combinations that Thrustcurve.com says don't work fly just fine, even in 10-12 mph breezes. Better to come down on the side of caution though that's for sure !

Hah, yes! After I got my L1, I checked it on thrustcurve and it said "Don't Use this Motor!"

I've got a stout School('d) Rocket of similar weight to your numbers that's built for Pro24 6 grains and still flies to about 300' on a D12. That being said, it's got rail buttons on it also, so that helps.

I've successfully launched the prowler on a D12-3, and E12-4 and many of the others on this list. My completed rocket comes in just below 9.2 Oz w/o motor, I swapped out a few components to get to that weight, but never had an issue with those two motors on a 6 foot rod. E18-7 is also a great motor.

Thanks for the real world reports, thrustcurve gives speed at a thee foot rod, and some of those failed engines are getting close to the threshold of fifty ft per sec, so good to hear some confirmation that a longer 5 or 6 ft rod would help with the lower thrust engines.