Roadrunner Motors

[Marlin523]

When designing a rocket are there any special things to consider the use of these motors compatible with other motors? What length should the motor tube be. The site says no hooks. What retention system do you use? Thanks for your info

 

[troj]

The problem with engine hooks with APCP motors is that the ejection charges are typically more energetic than BP motors, so the motors will often pop past the hook.

A better route is to use a screen clip, or something similar.

-Kevin

 

[n5wd]

When designing a rocket are there any special things to consider the use of these motors compatible with other motors? What length should the motor tube be. The site says no hooks. What retention system do you use? Thanks for your info

Marlin,

The Roadrunner motors have a built-in thrust ring that'll keep the motors from continuing down the motor tube. You'll need some sort of motor retention, or do like many people do and use masking tape to friction fit the motor into the tube. I usually try to keep my motor tubes long with a centering ring on the top to minimize the ejection charge gas just filling up dead space.

I use "Kaplow clips" on my 29mm rockets for retention - brass strips that engage the thrust ring, and are secured by T-nuts and bolts on the aft centering ring.

You'll enjoy using the Roadrunner motors - it's about all our TARC team uses any more.

 

[New Ocean]

Or electrical tape. It has never failed me at about 10 cents per flight. It actually locks in tighter during the burn as it melts a bit.

 

[SecretSquirrel]

Marlin,

The Road Runner motors have a built-in thrust ring that'll keep the motors from continuing down the motor tube.

Actually, Roadrunner motors have a built-in thrust ring. Road Runner motors aren't available yet.

 

[texas-bill]

Road Runner motors aren't available yet.

That doesn't look like a Plymouth.

.

 

[n5wd]

Actually, Roadrunner motors have a built-in thrust ring. Road Runner motors aren't available yet.

Correction noted! Thanks. Missed you at the meeting, yesterday.

 

[quickburst]

Actually, Roadrunner motors have a built-in thrust ring. Road Runner motors aren't available yet.

No wonder!!!!!!
I haven't been able to get any, any where, the dealers act like they never heard of them.

 

[Initiator001]

No wonder!!!!!!
I haven't been able to get any, any where, the dealers act like they never heard of them.

Sounds like trying to find/buy Roadrunner rocket motors here in California.

 

[shreadvector]

Sounds like trying to find/buy Roadrunner rocket motors here in California.

Maybe it's the Warner Bros attorneys?

I've actually seen 1 roadrunner in my 29 years in CA, and it was running down the road in my neighborhood a couple of years ago. I asked a bird expert who said they are somewhat common in this area, but that is the one and only one I've ever seen. They must get squished a lot.

 

[H_Rocket]

Something about a 5.5" CF airframe with a 440 cu in Magnum with a six pack induction system sounds just really "knobby"








Actually that would not really work as my 426 Hemi required anything but knobs. in fact I used slicks.

 

[rocket999]

Our club uses lots of Road Runner motors. I use tape to hold them in. Pretty much as cheap and simple as it gets. Works fine.

Sam

 

[kelltym88]

Maybe it's the Warner Bros attorneys?

I've actually seen 1 roadrunner in my 29 years in CA, and it was running down the road in my neighborhood a couple of years ago. I asked a bird expert who said they are somewhat common in this area, but that is the one and only one I've ever seen. They must get squished a lot.

You didn't see it because it was probably strapped to an ACME rocket chasing a coyote! :roll:

But seriously, are Roadrunner motors not CSFM aprroved?

 

[shreadvector]

You didn't see it because it was probably strapped to an ACME rocket chasing a coyote! :roll:

But seriously, are Roadrunner motors not CSFM aprroved?

IIRC, They are indeed CSFM classified as Model Rocket Motors.

Apparently I do RC:

https://www.roadrunnerrocketry.com/

 

[bobkrech]

No wonder!!!!!!
I haven't been able to get any, any where, the dealers act like they never heard of them.

Dave

Consider this. https://www.roadrunnerrocketry.com/dealers/launchsitevendor.htm

They're really nice midpower motors.

Bob