gtg738w
FlightSketch - flightsketch.com
- Joined
- Dec 27, 2018
- Messages
- 350
- Reaction score
- 395
I’ve made some progress on a 24mm conversion. I’ll get some data on a C11 & D12 if the weather improves out here.
View attachment 381788
I flew one on a C6-3, C12-4, and D16-4, on a dead calm day. The C6 was sufficient, but did arc over quite a bit, and was past apogee when it deployed. The Q-Jets were both nice straight flights.
However, the motor I used was rather old (1996) and the delay was WAY short. The upshot of that was that it ejected going up, the 'chute stripped three shroud lines and so it broke off two fins (and cracked the LES) on the bounced landing
I wonder if at club launches RSOs may step in if the first few C6-3 flights are sub-nominal.
There should not be a problem with that at all, clear fins plenty big enough. Not much difference in weight to a C6-3...There is plenty of room around the paper tube inside where it separates for a little clay...Is there a rocksim file available for this rocket? If I get this kit, I would want use the D13W reloads that I already have. A white flame fits a Saturn V better then the black smoke of the QJets.
I launched mine this morning trying out a new flying field (small park next town over that didn’t really work out) on a C6-3 and had a lot of arcing over. Barely a 5 mph breeze but not near the vertical flight I’d anticipated. As soon as my regular field is available I’ll try a QJet - do the QJet C motors have a power advantage over an Estes C6? I’m also wondering if Estes has higher powered 18mm motors in the works - certainly possible and would be welcomed if they do.The C6-3 flights are a bit underwhelming but OK if it's not too windy. I've flown it with a D16, probably a D10 is next up but I wouldn't hesitate to use a D13.
With the D16 it really moves off the pad, I don't think you'll be real focused on the smoke color so much as keeping an eye on it, and that black smoke is really only dark right near the pad.
Perfect! I’d guesstimate mine went 175ish feet, considering the arced flight path, on the Estes C6-3 (delay worked ok) so 300-350 feet on a QJet C would make for a great demo rocket. I’ll try both a QJ D and C next time. And maybe the Flight Sketch adapter is an option too - BP C motors seem like a natural fit for this rocket.A Q-Jet C has about one more N-s of total impulse (per certification data) but in this model takes it to nearly twice the altitude (as measured by an onboard altitmeter - a Flight Sketch Mini beta unit in my case).
The big Q-Jet advantage is the almost instantaneous thrust at ignition rather than the ramp-up over a quarter of a second or so on the Estes C6. The Q-Jet thrust then increases until burnout. Quite a different approach which this model seems to really “appreciate”.
PLUS SHIPPING - unless you buy enough to get free shipping.....I suggest buying a case of 6. You can't afford NOT to buy a case of 6!So this is why local hobby shops are dying. At AC supply they're $54 and $42.
Growing up in the 70's and 80's we had 6 or 7 hobby shops within an hours drive. One I could get to inside of 5 minutes on my bike. Now I have a 90 minute drive to the closest Hobby Town which is woefully understocked on anything other than RPG and card games.You have to remember that the LHS has overhead. Bitch about them all you want but you'll miss them when they are gone.
Mike
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