I will admit that that is very cool. When people suggest a model that will accomplish L1, L2, and L3 the discussion is usually centered around a LOC Bruiser. A half Bruiser will fly on a high average thrust I motor with motor deployment, followed by a mid range J or K with a payload, then a long burn M for the finale.
This changes that up entirely. I expect that people could easily recreate your design and accomplish this feat.
Also, you could have gone for 8 classes with an F240 as noted eariler...and with an accelerometer like the Raven an E75 MAY be possible, albeit marginal.
A looooooong rail would be very important for the E flight.
It is my goal in designing a simple rocket and documenting its construction to make it easy for others to replicate my results.When people suggest a model that will accomplish L1, L2, and L3 the discussion is usually centered around a LOC Bruiser. A half Bruiser will fly on a high average thrust I motor with motor deployment, followed by a mid range J or K with a payload, then a long burn M for the finale.
This changes that up entirely. I expect that people could easily recreate your design and accomplish this feat.
About 130'-long rail would do nicely.A looooooong rail would be very important for the E flight.
Now now Kit. It will take me a long time to surpass you. I'm really looking forward to seeing you at a launch soon.You have indeed become the TubeFather of TRF.
It may be hard to tell with transonic noise. I have posted both graphs and raw altimeter data along with photos of each flight though, so you know as much as I do.What max speed did it hit on the M?
The fuselage is one uncut length of 3" blue tube. It comes in 48" lengths, so that's how long the fuselage is. Simple and easy to replicate :=)Hey iter what was the length of the air frame . I'm trying to get proportions right on a few of my 4" tube fin rockets thanks Chris
Thank you for your encouragement Kit.My approach to landing damage control is right-sizing chutes :=)
As far as Mach, I doubt a tube fin can punch though. OTOH, it's unclear to me that one must disintegrate when it gets close. The 1.5" BFT survived a J510 which simmed to Mach 1.33.
Ari.
For those who are asking--here's my OR file.
I'd like to hear more opinions on the actual top speed from baro data. I hear all kinds of noise happens around Mach that makes it hard to read graphs. I have very little experience with supersonic baro graphs and don't know what to make of the wiggles. before and after max velocity. The highest number in the file itself is 1760.
Ari.
Fin edges are square. I made no effort to reduce drag. BFT3 has very thick rail guide standoffs and an atrocious retainer. Retainer is a full 3/4" wider than the fuselage. BFT3, as it stands, optimizes for versatility, durability and quick turnarounds--Aeropack retainers are great for that. To optimize for performance, I'd airfoil the fins, remove rail guides and use a tail cone closure on the motor. This would require a bulkhead in the fuselage and would make it harder to use smaller motors (still possible, just extra fixture and extra time to turn around). I'd make up a kind of tower with 6 cantilever square tubes that would each go through a fin and hug the fuselage.didn't know if you put the profile of the tube fin to get it to work . was thinking each fin would to be three fins in a sim to shown cd . also why are they 6" tall thanks chris
A tube fin could totally punch through Mach.
This rocket gets cooler every time I read about it.
I love how quickly accepted wisdom changes.
Ari.
This is amazing. Did you use adapters until the minimum diameter L and M?
Thanks. One more question, how long are the fins? I think I might try building one of these.
Please do Robert. I'm pretty sure what happened, but I like another point of view regardless.
I put a 7-motor BP cluster in BFT on Saturday (6xD12 + 1xF15) and one of the Ds CATOed. It looks pretty bad. There's thermal damage inside the fuselage. I'm unclear on how much weaker the airframe is now. In a way, this rocket has already accomplished what it set out to do. In a different way, I was looking forward to having this as my "go to" rocket at club launches.
Ironically, all 7 motors lit properly and simultaneously. One of them just lit too well. In the photo sequence you can see the rocket actually going up on 6 motors until it overtakes its own ejected nosecone. I'm sad.
[video=youtube;cf0Fc2RGqRs]https://www.youtube.com/watch?v=cf0Fc2RGqRs[/video]
www.youtube.com/watch?v=cf0Fc2RGqRs
Ari.
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