LOCIV delay question

[skaffgeorge2]

Is 14 seconds too long a delay for a 29mm single Use H motor in a LOCIV?

 

[Steve Shannon]

I would expect so. Simulate it using open rocket. I bet the appropriate delay is somewhere around 8 seconds. Saying that it’s an H motor covers a lot of range. The average thrust and total impulse make a lot of difference and of course the weight of the fully loaded rocket does as well.

 

[tsmith1315]

If you’re working via phone, I think you can use the simulator at Thrustcurve.org.

 

[Art Upton]

Is 14 seconds too long a delay for a 29mm single Use H motor in a LOCIV?

YES

 

[Art Upton]

Frankly , and Sherly ; after the year of LOC rockets I have flown, the LOC 4 has fins that can hit the ground and break making your cert go bad. '

Instead special order on Chris' website the LOC PHantom, I did the beta test on that rocket.

It did all kinds of fun stuff on my older days; I lost it on a J570 that took out the fins but it still when up Up

 

[Art Upton]

To make this clearer, the LOC IV Fins extend past the end of the body tube. Under Chute on landing on hard ground could cause a fin to break. In my Shed's loft I have one that has one broke from years and years ago.

Fins that do not extend past the bottom of the body tube help prevent that.

 

[Rob Campbell]

My guess is the delay should be about 8 seconds for a LOC IV. I'm basing that on my experience with my Zephyr, another 4 inch diameter 3FNC rocket.

 

[Rocketjunkie]

Baby H like a H128, -7. Full H -10. That's if the LOC IV is built somewhere near stock.

 

[Back_at_it]

Flown mine on an H100 with the delay drilled to 8 sec. My build weighs in at 37.3oz complete without motor.

I can't think of a single use H motors that would work with a 14 sec. delay in LOC IV.

 

[T-Rex]

@skaffgeorge2 please remember that the delay can (and must) be drilled to the proper length. This applies to all RMS, DMS and CTR motors.
I have seen what happens university flyers who neglect to do this during cert flights. Some were signed off because the chute opened just in time (not my call), some had to repair or replace their rockets.