Hi TRF colleagues,
I am hoping to fly a LOC Warlock this summer at the MARS Club, of which I am a member, to go for an L2 certification.
I purchased the kit a few months ago, and up to now I have had the time only to do a dry fit. In a couple months’ time, I plan to build and paint the kit. I have uploaded both my RockSim and my OpenRocket files, and those two files indicate the actual measured weight of each component.
I plan to dual deploy using a Jolly Logic Chute Release with the drogue parachute set to open at motor ejection and the main parachute programmed to open at approximately 150 metres. I intend to use a Cesaroni J430WT — assuming I can purchase one at Geneseo — with a 10-second delay.
Here is the situation. Using RockSim, every simulation works beautifully, even though my stability margin is a little less than 1.0. With OpenRocket, however, I am getting negative stability, and not even one simulation has succeeded. I have applied the base-drag hack, which has tremendously helped the stability margin, but then I get the discontinuity warning so that I cannot run the simulations.
I am thinking of ordering a custom-made body tube from LOC/Precision. The kit comes with a 76.2-centimetre body tube, and I would like to replace that with a 100.0-centimetre body tube. That should improve the rocket’s stability, although I am already getting successful simulations with RockSim. Even using a 100 cm body tube OpenRocket continues to show a negative stability margin.
So, what do people think of this idea — modifying my LOC kit to have a rather longer body tube?
Thank you.
Stanley
I am hoping to fly a LOC Warlock this summer at the MARS Club, of which I am a member, to go for an L2 certification.
I purchased the kit a few months ago, and up to now I have had the time only to do a dry fit. In a couple months’ time, I plan to build and paint the kit. I have uploaded both my RockSim and my OpenRocket files, and those two files indicate the actual measured weight of each component.
I plan to dual deploy using a Jolly Logic Chute Release with the drogue parachute set to open at motor ejection and the main parachute programmed to open at approximately 150 metres. I intend to use a Cesaroni J430WT — assuming I can purchase one at Geneseo — with a 10-second delay.
Here is the situation. Using RockSim, every simulation works beautifully, even though my stability margin is a little less than 1.0. With OpenRocket, however, I am getting negative stability, and not even one simulation has succeeded. I have applied the base-drag hack, which has tremendously helped the stability margin, but then I get the discontinuity warning so that I cannot run the simulations.
I am thinking of ordering a custom-made body tube from LOC/Precision. The kit comes with a 76.2-centimetre body tube, and I would like to replace that with a 100.0-centimetre body tube. That should improve the rocket’s stability, although I am already getting successful simulations with RockSim. Even using a 100 cm body tube OpenRocket continues to show a negative stability margin.
So, what do people think of this idea — modifying my LOC kit to have a rather longer body tube?
Thank you.
Stanley