- Oct 12, 2009
- Reaction score
Any one seen any of the new Quest D's? Why did they make them 20mm instead of 18 or 24?
Dark Lord Of The Scratch Builders
Dark Lord Of The Scratch Builders
According to Nettie, coming in March. To paraphrase her message, there were many people who wanted to get their hands on the motor, so they were released sooner, but tubes and adapters, etc. are coming soon.Ironically, Quest does not have a tube to fit it...
Good! More for me...! It's simple enough to roll your own tube. The answer to the question, "why 20mm?" might be related to being able to pack in more propellant (for a longer burn) without going up to 24mm. Possibly a better thrust-weight relationship with the 20mm diameter. Just because 13-18-24 has been standard for BP motors doesn't mean that those sizes are mandatory. I see nothing wrong with thinking outside the range box. There are no motor tubes for 20mm at present because there has been no need for them; that has changed now that the Quest D5s (with ejection charges) are here. I think that we will be seeing new 20mm motor tubes, centering rings, etc, in the very near future.How weird. I won't be stocking up on those
You can peel off the label, but the printed info still applies!But after receiving my order from the Pres-day-sale, I have to confess that I opened one of my new D motors to fondle it a little bit. (I know, TMI)
I am impressed that the rolled motor case appears to be high quality, and even the cuts at the end of the case are neat and clean (better quality cuts than I have often seen on many motors from a certain Penrose manufacturer).
Nozzle materials also seem impressive. The nozzles are a uniform grey/gray/whatever and seem to be made from a clay that was very finely powdered. No perceptible grit or roughness, no visible "crystal" patterns, very shiny smooth faces and sharply defined corners, very high levels of manufacturing craftsmanship (do those two even go together?). No significant nozzle-induced swell in the aft end of the case on the examples I checked.
The thing that surprised me was that the paper label is almost sloppily applied, by comparison with the rest of the motor. The loose label makes the whole thing look more like a firework toy purchased from a roadside stand. I am a little concerned if removing part/all of the label will fall into the category of "tampering" because it sure looks like a bunch of label will be scraped off when inserting these into a motormount. Label craftsmanship is definitely inconsistent with the rest of the motor.
I'm just itching to try sleeving one of these to fit a 24mm mount, and hear 4+ seconds of loud (load?) thrust!
Sounds like the motor was made in Germany and the label was applied in China.I am impressed that the rolled motor case appears to be high quality, and even the cuts at the end of the case are neat and clean (better quality cuts than I have often seen on many motors from a certain Penrose manufacturer).
The thing that surprised me was that the paper label is almost sloppily applied, by comparison with the rest of the motor. The loose label makes the whole thing look more like a firework toy purchased from a roadside stand.
I'll be interested in the result. My initial simulations say you have to watch the weight of models when flying this motor, but I suspect if you get that right, then you'll be rewarded with some spectacular flights that will be slow and majestic.I'll be flying at least one D5 on Sunday!
I once wrapped a 2.5" Kosdon L1600 with enought regular old masking tape to fit it in a 3" motor tube, clamped it down and lit 'er up. Now, if I'da put more tape around the base of the nosecone it wouldn'a fell off at about 500'How weird. I won't be stocking up on those
They're very similar. However, IIRC, the E5 had a larger initial thrust spike for lofting larger models.I'd like to hear one of these new D motors. An old favorite was the FSI E5 Steaming Tea Kettle motor. I had a special rocket for these and even when K's ands L's and M's were going off for some reason people stopped and watched those flights
The FSI E5 and F7 were called "Steam Machines" because they kept going and going but could barely lift more than their own weight! Put a minimum diameter airframe around them and let em go! Never heard one whistle, but that may have happened to some people.Steaming Tea Kettle, huh? This I have to hear. I just bought a dozen of these motors and I can't wait to try them out. Did the "tea kettle" sound include the whistle?
I was able to fly one D5-4 motor at the SCRA launch in Los Angeles today/Sunday.
Rocket used was an Estes Eliminator kit.
I made a 20mm/24mm motor adapter by taking an used D12 case, knocking out the clay nozzle and peeling the inside of the casing.
Weight of the Eliminator with D5 motor was 6.1oz.
There was little/no wind when the rocket launched. That D5 seemed to burn forever.
The parachute deployed and the rocket was recovered undamaged.
Next time, I will use a lighter weight rocket.
Actually, they do. I bought one and a 20mm nosecone. The label will have to be peeled off to fit in the tube, and the nosecone will need a little tape on the shoulder, but it looks workable for a scratch-built high-altitude bird.Ironically, Quest does not have a tube to fit it...