Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Weather-Cocked > Current Kit Talk
User Name
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read

Thread Tools Search this Thread Display Modes
Old 10-22-2017, 12:28 AM
ghrocketman's Avatar
ghrocketman ghrocketman is online now
Join Date: Jul 2005
Location: Michigan
Posts: 8,835

I like the Estes E16 and F15 29mm BP motors, but an E35 or F40 in the same SU BP format would be far more useful. All it would take is a pintle in the nozzle when the BP core is pressed into the casing. Would be similar to the old C5/B8 18mm motors- "semi" port-burning without the hazard of drilling cores like the old B14. It was easily done in the 60's and 70' could be done far easier and more safely now with automated controls. Why it is not done is a bunch of hogwash EXCUSES.
When in doubt, WHACK the GAS and NEVER touch the brake !!!
No Harm=NO Foul advocate

If you are NOT FLYING LOW in the left lane, you need to GET THE #$&@ OUT of it !

Yes, there is such a thing as NORMAL
, if you have to ask, you probably aren't
Reply With Quote
Old 10-22-2017, 09:45 AM
stefanj stefanj is offline
Master Modeler
Join Date: Mar 2005
Location: Hillsboro, OR
Posts: 2,536

Yes! Even a relatively tame F24 would be welcome. An F24-0 would give a nice kick to two-stage models.
NAR #27085 - Oregon Rocketry - SAM
Reply With Quote
Old 10-22-2017, 10:37 AM
Doug Sams's Avatar
Doug Sams Doug Sams is offline
Join Date: Mar 2005
Location: Plano, TX resident since 1998.
Posts: 3,914

Originally Posted by ghrocketman
I like the Estes E16 and F15 29mm BP motors, but an E35 or F40 in the same SU BP format would be far more useful.
No doubt, in booster applications, the higher thrust is very significant to avoid weather-vaning (and cruise missiles). But we also know that the higher pressure of the deep core will have the guys in the quality and reliability departments throwing their trump cards at the motor engineers There will surely be a shift in failure rate and hence more liability, with possible safety issues as well. (Alternatively, fixing all that would push the costs out of range.)

Anyway, using these motors, the challenge is to either build very light, or build a cluster to get the rocket in the air with authority. A lightly built rocket on an F15 might need to have intentional drag added to keep in recoverable. And a cluster has the challenge of getting them all lit, but that's manageable - I've had success with several rockets that use a larger central motor with multiple smaller outboards. And that's pretty much how I have envisioned using the 29mm Estes E and F booster motors.


YORF member #11
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -5. The time now is 03:24 PM.

Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe 1998-2018