Oops---Got a 24mm Instead of a 29mm F Engine

[tfrielin]

I got an F32-6T 24mm engine for my Pro Series II Nike Smoke instead of a 29mm size.

I ordered an adapter to so it will fit the 29mm Nike Smoke.

But my question is---will that 24mm smaller diameter be ok to use in my Nike Smoke?

My original plan was/is to use F27-4R engines (I have four of those) to boost the performance over the F26-6 I used before.

So, is the smaller 24mm diameter going to give me anough performance?? Or is a 24mm F32 not powerful enough?

 

[DigBaddy]

Have you simulated the motors in your rocket in Rocksim or Openrocket? You can also do basic sims on https://www.thrustcurve.org/

F26 and F32 have more total impulse than the F27. The F27 has about 80% of the impulse of the F26 and 87% of the impulse of the F32. The F27 starts out with less punch than either the F26 or F32. The F32 hits harder.

The F32 will work fine if you are ok on the F26 or F27.

You may also want to read this page. https://www.thrustcurve.org/info/motorstats.html

 

[neil_w]

I got an F32-6T 24mm engine for my Pro Series II Nike Smoke instead of a 29mm size.

I ordered an adapter to so it will fit the 29mm Nike Smoke.

But my question is---will that 24mm smaller diameter be ok to use in my Nike Smoke?

My original plan was/is to use F27-4R engines (I have four of those) to boost the performance over the F26-6 I used before.

So, is the smaller 24mm diameter going to give me anough performance?? Or is a 24mm F32 not powerful enough?

In general, only the thrust curve matters, not the size of the motor. I would sure think that an F32 is *more* than enough motor for an Estes Nike Smoke, but @DigBaddy wrote above you don't need to guess, just sim it in OR or Rocksim, or even easier just check on thrustcurve.org to confirm that speed off the rod/rail is OK, and confirm delay times.

 

[tfrielin]

Have you simulated the motors in your rocket in Rocksim or Openrocket? You can also do basic sims on https://www.thrustcurve.org/

F26 and F32 have more total impulse than the F27. The F27 has about 80% of the impulse of the F26 and 87% of the impulse of the F32. The F27 starts out with less punch than either the F26 or F32. The F32 hits harder.

The F32 will work fine if you are ok on the F26 or F27.

You may also want to read this page. https://www.thrustcurve.org/info/motorstats.html

View attachment 558072

Thanks for this information

I was ok with the F26 performance but thought the Nike needed more power

I hope the F27 will be enough more

Anyone have any experience with Nike Smoke on F27-4Rs??

 

[DigBaddy]

Thanks for this information

I was ok with the F26 performance but thought the Nike needed more power

I hope the F27 will be enough more

Anyone have any experience with Nike Smoke on F27-4Rs??

Depending on how you measure power; that F27 has less. It averages 1Ns more, but only has 49.6Ns of total impulse. The F26 averages 26, but has 62.2Ns total impulse plus it starts out with higher thrust than the F27. The F27 catches up, but by that time you're off the rod/rail and hopefully it's moving fast enough by then.

Not sure on how the 4s delay will be with that rocket....which is why simulations are good to run.

 

[waltr]

Yes, run the sim.
First number I look at is Speed Off the Rail/Rod is above the minimum needed.
Then Apogee and last recommended Delay time.

 

[markg]

Thanks for this information

I was ok with the F26 performance but thought the Nike needed more power

I hope the F27 will be enough more

Anyone have any experience with Nike Smoke on F27-4Rs??

I haven't flown it on an F27-4, but I would. My sim shows 42.8ft/s on a 6ft rail.

cheers - mark