Unstable rocket under 'P' power...

[marchingpackofCeHS]

i love how it goes strait after it starts going to the side haha

[normellow]

Yup that rocket needed to be a wee bit longer !!!!

[unobombers]

thank you :)

[OmniPhun]

Shouldn't the center of gravity always be placed as far to the rear as possible?

[unobombers]

As it's known to me, one people claim that center of gravity should be a little higher than the center of the rocket, or the CP, whereas other tell that it should be as low as possible.. sorry for asking such a silly question, but which one is truth? or could you recommend me some literature about this? Thank you.

[AZRon34]

Center of Gravity (CG) MUST be in front of the Center of Pressure (CP) ALWAYS... if they swap places, the rocket will be unstable. It's generally recommended that the CG be 1x-2x the diameter of the rocket in front of the CP. ie for a 3" rocket, the CG should be 3"-6" in front of the CP.

[unobombers]

hmm was the centre of gravity too high or other problem?

[AZRon34]

Yes... it didn't have enough noseweight for the motor. Once it burned off enough propellant to shift the CG forward, it stabilized and flew off down range. It impacted about 4 miles from the launch site. TOTAL loss.

[parissiren]

think if you are cruising in your new hummer at the desert, speeding as fast as you can, and then WHAM!! That rocket would fly trhough your windshield and i can promise that you would be punctured by it as a piece of paper! :D

[DTHRocket]

You can see that once it had burned off enough propellant it got stable because the CG shifted forward.

I've never seen such a large rocket unstable!

[AerotechMan101]

LMAO

needs some work!

Gotta love the BALLS flights

[nicksynnz]

not the CP CG reversal I think it lost a fin or the motor mount and centering rings gave way due to the huge pressure putting the huge rocket off course,

[AZRon34]

The CG was too far aft from the get go. The motor weighed 100lbs. Had the rocket been a few feet longer, it would have been ok, or had some noseweight in it. The construction was excellent. Everything stayed together... until it impacted!

[normellow]

The rocket needed to be longer probably another two or three feet. !

[esmhorn]

my guess is what the man on the video says. The rocket was unstable right off the pad so it looks like the relation between the cetner of pressure and the cetner of gravity was off. Seems like a pretty big thing to miss, especially with such a huge project.

[eastoff1]

wow ive had them blow up when it was 20 feet off the launching rail.

[Ashercrazicakes]

these rockets are not guided in any way the reason would probably a fin broke off during flight or it was unstable when launched

[unobombers]

was it with RC control, or simply unstable?

[normellow]

In high power rocketry we are not allowed to have any r/c guidance ! Not even a gyro ! Or it would be a guided missile .

[VilliVanilli]

Must have "locked on" to a small bird ;)

[DTHRocket]

I've never seen such a big rocket so unstable.

[hanratty84]

where can i buy one

[Atevra]

you cant.