Rocket Lesson of the Day

[cwbullet]

When you assemble an a motor for use with electronic deployment, you still need a delay grain.

Without a delay, the motor becomes a bidirectional fireworks fountain.

 

[jd2cylman]

Pictures?
Some lessons are more expensive than others...

 

[cwbullet]

When I get home.

 

[tim cubbedge]

Did it look anything like this?

 

[cwbullet]

That is pretty close. The sad thing is it happened to the same rocket twice in one weekend. This time it is gonna take a lot more repair work.

 

[blackjack2564]

Yup, been there done that.
J-90 long burn,in my original Wildman rocket,
Without the delay it REALLY burned a looooooooooong time. The pic was cropped from Rockets mag and made into the infamous poster!

I had the delay loaded and ready on table BUT was talking to someone and grabbed a empty closure and screwed it on...lol.......not paying attention.

Same thing Chuck?

 

[BDB]

When you assemble an a motor for use with electronic deployment, you still need a delay grain.

Without a delay, the motor becomes a bidirectional fireworks fountain.

Is this true even if you have a plugged forward bulkhead?

I’m pretty sure I’ve flown Loki 38 mm motors with a plugged forward closure with no delay. Maybe I’ve just gotten lucky....

 

[dhbarr]

Same if you overdrill the delay, my Mustang went out that way.

 

[Brent]

Did it happen yesterday too?

 

[dr wogz]

Same can be said for CTI motors, when you forget to put the reload into the case (and just load the reload into the rocket) !!

 

[djs]

Is this true even if you have a plugged forward bulkhead?

I’m pretty sure I’ve flown Loki 38 mm motors with a plugged forward closure with no delay. Maybe I’ve just gotten lucky....

Normally no- you wouldn't need this. However without a delay grain, you run the risk of putting the igniter in too far up and having trouble lighting the motor.

 

[Nytrunner]

I love that picture. The mouth is in the perfect position