Open Rocket vs Experience in HPR

[G's Monster Rocket]

My question is directed to the folks with years of experience in HPR. I have built a 4" diameter 90" long rocket going up on 54mm motor. All scratch designed using Open Rocket. The initial motor of choice is an A/T L1090. If I choose to use a different motor, K250W-P, the altitude at apogee is nearly the same with a burn time of 9.3 seconds, but the V off the pad is 1/2 that of the L1090. Based on the rocket @ 22 lbs, is 40.8 ft/s too slow to be stable off an 8 ft 1010 rail, given wind max at 10 mph?

 

[cls]

Based on the rocket @ 22 lbs, is 40.8 ft/s too slow to be stable off an 8 ft 1010 rail, given wind max at 10 mph?

Yes

 

[Banzai88]

Most folks consider 45fps off the rail in no-wind conditions a minimum safe launch speed, increasing as wind speed increases.

 

[mtnmanak]

The thrust-to-weight ratio for the K250 is only 2.1:1. I can't imagine any club allowing that rocket to fly on a 2:1 T:W ratio. I can't speak for every club, but all the clubs I fly at require a minimum of a 3:1 ratio, and even that usually requires an elevated approval in most places, with 5:1 being the "at the RSO table" minimum.

I would recommend running your rocket specs through Thrustcurve first, then using a simulator. Thrustcurve will at least help you rule out any motors that are absolute no-go's.