Devilish Project (Go Devil 38 kit bash)

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OverTheTop
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Re: Devilish Project (Go Devil 38 kit bash)

Postby OverTheTop » Mon Dec 18, 2017 3:44 pm

I don't have the luxury of a 7:1 VK, but it really matters how much I bash the kit as to what I end up with :D

It is already significantly different. Only some of the parts are a starting point.

The intent is to think about a few things along the way and then do the same thing, but better, to the 54mm version :shock:
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Re: Devilish Project (Go Devil 38 kit bash)

Postby drew » Mon Dec 18, 2017 4:45 pm

OverTheTop wrote:I don't have the luxury of a 7:1 VK, but it really matters how much I bash the kit as to what I end up with :D

It is already significantly different. Only some of the parts are a starting point.

The intent is to think about a few things along the way and then do the same thing, but better, to the 54mm version :shock:


I only make the kit bash comparison because hand rolled CF airframes are significantly lighter (and therefore faster) than thin wall FWFG that I assume the Go Devil 38 kit uses.

Here's the OP for Simon and Andrew's 38. Look at the size of the thing!

https://forum.ausrocketry.com/viewtopic.php?f=56&t=1196&p=36640&hilit=EqNSwOw1myw#p36640
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OverTheTop
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Re: Devilish Project (Go Devil 38 kit bash)

Postby OverTheTop » Mon Dec 18, 2017 5:25 pm

Thanks for the post with the info. Nice. What was the launch mass, sans motor for the rocket?

I will be using thin-wall f/g tubing, but I will be shaving off mass wherever possible. Might not make it as far along as "Mach Madness", as I am starting from some heavier components (NC and airframe).

Currently looking at a pair of Ravens (four batteries) and a Telemega. If I can live without one altimeter I can save about 20 grams or so. Not sure if it is worth saving yet.
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Re: Devilish Project (Go Devil 38 kit bash)

Postby drew » Wed Dec 20, 2017 11:23 am

OverTheTop wrote:Thanks for the post with the info. Nice. What was the launch mass, sans motor for the rocket?


Great question! Sumo? Maybe you can finally lift the kimono on this project and share some vehicle details? :wink:
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Re: Devilish Project (Go Devil 38 kit bash)

Postby joeman » Fri Dec 22, 2017 2:56 pm

Hi OTT.

Thanks for sharing your project build on here. Looking forward to seeing it progress. Plenty to learn. Lots of fun!

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Re: Devilish Project (Go Devil 38 kit bash)

Postby Sumo310 » Wed Dec 27, 2017 9:49 pm

Thanks for the encouragement Drew... updated details on the 38mm rocket Dave and I built are here:

viewtopic.php?f=56&t=1196&start=90#p69369

Sorry for the hijack OTT.
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Re: Devilish Project (Go Devil 38 kit bash)

Postby kopius » Fri Dec 29, 2017 1:23 pm

OverTheTop wrote:That is the motor I am leaning towards currently.

OTT, have you considered the J510? https://ausrocketry.com.au/j510w-l.html
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Re: Devilish Project (Go Devil 38 kit bash)

Postby SpaceManMat » Sat Dec 30, 2017 8:14 am

kopius wrote:
OverTheTop wrote:That is the motor I am leaning towards currently.

OTT, have you considered the J510? https://ausrocketry.com.au/j510w-l.html


Looks like Aerotech is the way to go if you want speed in a 38mm J. CTI don’t build anything bigger that a 4 grain imax. I suspect there’s an upper limit on that rear closure somewhere round the 932N mark.
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Re: Devilish Project (Go Devil 38 kit bash)

Postby drew » Wed Jan 03, 2018 12:55 pm

SpaceManMat wrote:Looks like Aerotech is the way to go if you want speed in a 38mm J. CTI don’t build anything bigger that a 4 grain imax. I suspect there’s an upper limit on that rear closure somewhere round the 932N mark.


I'm not too sure about that. The J530 from CTI is a good candidate and is a 6GXL Imax motor. It sits between the J570W and the J510W in terms of both total impulse and length.
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AMRS 28 L3
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Max Alt AGL - 23,908ft - K300 - Balls 22
Max V - 2,488 ft/s, ~Mach 2.2 - M2250 - THUNDA 2015

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Re: Devilish Project (Go Devil 38 kit bash)

Postby SpaceManMat » Fri Jan 05, 2018 9:52 am

drew wrote:
SpaceManMat wrote:Looks like Aerotech is the way to go if you want speed in a 38mm J. CTI don’t build anything bigger that a 4 grain imax. I suspect there’s an upper limit on that rear closure somewhere round the 932N mark.


I'm not too sure about that. The J530 from CTI is a good candidate and is a 6GXL Imax motor. It sits between the J570W and the J510W in terms of both total impulse and length.


Opps sorry meant vmax, I’m looking at peak thrust.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 10,849 feet
Largest Motor: CTI 1115J530 IM
Current Project: X Wing


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