http://www.entertonement.com/clips/ljwdgkrgyj--11




http://www.rocketryforum.com/showthread.php?t=9069

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-Fred Shecter NAR 20117 (L2)
Southern California Rocket Association, NAR Section 430

Yes!

D8-0 boosters, too!

I am sure it was quite an ordeal for Bill/Quest to get all the issues with getting these motors imported and approved but I am glad Quest hung in there and saw it through.

Thanks, Bill.

Bob

Based on the average thrust and total impulse, the D5 (why didn't they call it a D4?) should have a really long burn . . . about 4.5 seconds. Like the old FSI D4, but a REAL D as opposed to a fat C.

I'm going to start building my FSI clones with appropriately recessed engine blocks.

The D5 would also make a nice upper stage motor, although it would be be better if the delay were a touch longer.

Hmmm, a 24mm "upscale" Stargazer clone with a D8-0 and a D5-6 would really zoom.

Is that info on the D5s correct in the TRF post - 20mm diameter rather than 24 like the D8s?? I guess that means making 20 to 24mm adapters. Anyone have centering rings for that (20mm tubing into BT-50) I wonder?

Yes, the D5 motors have a 20mm diameter.

Quest has been selling the D5-0(P) motor for awhile which works well in gliders.

I'm looking forward to flying D5 & D8 motors.

Bob

It does indeed have about a 4-5 second burn. Gives an Applewhite UFO a strange flight! Kinda vibratory in tone. I'd love to try a D5-0/d5-0 in a modified FlisKits Frick'n'Frack, on a dead calm day, just to see if it would hold up!

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Roy
nar12605

I figured out awhile back that one could use Semroc Series 085 tubing (LT-085) for motor tubes for these 20mm motors. The motors will need perhaps 4-5 wraps of masking tape to fit, which is similar to how FSI motors were fitted into their motor tubes. Alternatively, you can also take a length of Semroc BT-40 and slit it down the side, spread it open a bit and then glue it inside the LT-085 tube. There will be a small slot remaining along the new inner wall of the tube, but you can block that easily with another rectangle of tubing or some durable putty such as JB Stick or Bondo. You only need to block a small section of it at the aft end to create a gas seal for the ejection gas.

A 20mm diameter motor will fit into the resulting tube with 0.009" of clearance all around it. This should be tight enough, but if the motor is still a bit loose the fit can be enhanced with a wrap of masking tape.

Your new motor mount or motor adapter will have an outside diameter of 0.945" and therefore it will fit snugly inside a standard 24mm motor mount.

MarkII

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SAM # 0011

Without having actually seen any of them (yet), I can guess that these new Quest 20mm diameter motors will appear to be only slightly larger than standard 18mm motors, and their profile will be noticeably smaller in diameter (thinner) than 24mm motors. 20mm is equivalent to about 0.787", so the motors will be just slightly too large to fit into a tube such as BT-40 (0.765" ID). Gluing a slit BT-40 inside a length of LT-085 would be the best available option for constructing either a stand-alone motor tube or a 24-20 motor mount adapter for them. Quest sells T20, or 20mm diameter body tubes, but 20mm is the outside diameter of those tubes.

MarkII

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SAM # 0011

Of course now that I'm more awake I see that the 20mm OD D5s wouldn't fit in T20 tubing

All sorts of provisions to invent, I guess, especially if one didn't want a rocket that could only be flown on the Quest D5. The D8s will be easier to use in an existing fleet built for Aunt Esther Ds (or Es)....

Lots of ideas popping this morning but I need to look at part specs before I say any more. One would hope that Quest would at least have 20mm ID tubing, motor blocks and maybe even motor hooks for these after they become available. Centering rings into T25, T30 and larger would be nice, too....but one step at a time. Right now I'm not sure where/when I could fly something that has 4.5 seconds of boost time, but it sure would be cool.

What's the ID of an Estes 24mm motor? Is there any hope there of using it as an adapter or mining one for centering rings to suit the Quest 20mm case?

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