Thanks Dave, but one thing I am good at is getting into the dog house, so this won't help me.
Just a quick update, I flew my BlackFly on an AT G79White roughly to 1500 AGL. The flight was stable enough with a very minor wiggle but respectable, I will most definitely keep some of those motors in my inventory. Still my fav motor is the G106 for this rocket but I still have two G250 Vmax motors to try.
One other thing that I would consider adjusting is the length of the tailcone. I now have three flights and after each flight there is a bit of blistering on the end of the tailcone. I think if the tailcones was a bit shorter it would help mitigate or even eliminate this. For anyone just starting the build I would sand off .25" and take it from there. For me I am going to sand the paint off the end then repaint just that area with some high temp paint. I am not sure if this will resolve or mitigate it for me as I believe it is caused by the underlying PLA off-gassing due to the heat. However to shorten the length once built with the retainer on, is possible but it would be a challenge for me.
If anyone tries to mitigate this on their BlackFly, please let me know what you try.
Hey Michael,
Here's where I ended up with my abbreviated tail cone, probably a bit less than 1/4" of material removed. I was trying to still cover the end of the aeropack. Should have flight results in November?
I foamed my fin can after double dipping the fin edges on the MMT. Minimal external fillets still to come.
What's the biggest motor anyone has flown a Black Fly on? Given the short rocket length, how close are people cutting the margin of stability?
Is the "heavy nose dragging the booster / deploy chute into booster" problem worse because you're using a JLCR and the system has time to start coming in fast? Wouldn't longer kevlar and main at apogee minimize this? Interested in your tiny drogue results.
I'll be putting a 29-6 grain in line at MWP... I'll let you know how it goes
Man that thing is going to be a tank with a foamed fincan. The tailcone looks great, it looks like you trimmed just the right amount.
The biggest motor I have flown is the CTI G106 Skid to 2200'. With that motor I am sitting with a margin of 1.3 cal and it has been my favourite motor so far. I have only launched it three times, the other motors are the CTI G80 Skid which was also dead straight and hit 1300 AGL, and the last motor I flew was the AT G79W, which was stable but with a slight wobble as the boost phase progressed, still a respectable performing motor and I would confidently fly it again.
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Wow very nice build and details, love the kapton tape touch and brass tip. Please post your results, pics videos, etc. I am looking forward to seeing what you do for the theme.
Black Fly is prepped with a CTI 29/6, 315-H235-BS, ready for MWP
Yes, H255, sorry.Do you mean the H255BS? Please post picks of how you packed the recovery gear with that 6 grain motor.
Black Fly is prepped with a CTI 29/6, 315-H235-BS, ready for MWP
just about every spot of space.
Correct. I could probably get a 29/6XL without much hassle. I'd need to ditch the Recon 20 chute for a Top Flight, but that wouldn't be a problem.So what you're saying is there's a little space left to put an even larger motor in it.
Why not an H399WT? It might break the sound barrier before leaving the rail but is that a problemCorrect. I could probably get a 29/6XL without much hassle. I'd need to ditch the Recon 20 chute for a Top Flight, but that wouldn't be a problem.
Why? You offering?
Why not an H399WT? It might break the sound barrier before leaving the rail but is that a problem
Hmm interesting. You should sim the other I motors as well. I224Cl is a pretty good one.
Did it with a much smaller rocket...Why not an H399WT? It might break the sound barrier before leaving the rail but is that a problem
I'll pick one up at the launch and fly it again.... All in the name of scienceJust for fun I simmed up the I243W and I224CL, and they are so close in performance. It makes me wonder why they would produce two motors that are so close, at least in my sim. Heck even a classic vs. white effect is pretty close.
Of course as per the pic cramming a 6XL case in my BlackFly, would be a challenge if not impossible. However it sounds like Eric built his BlackFly with long motor options in mind. I would love to see someone stick either one of these motors in their BlackFly.
Did it with a much smaller rocket...
https://youtu.be/qL2YG9Jzsuc
I'll pick one up at the launch and fly it again.... All in the name of science
Much better than my attempt:Did it with a much smaller rocket...
https://youtu.be/qL2YG9Jzsuc
Black Fly flew successfully on an H255-BS. It was awesome. Pics and video when I get home
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