Micro-Hybrids

Discussions on hybrid rocketry including rockets, motors and technologies.

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strud
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Re: Micro-Hybrids

Postby strud » Sun May 08, 2011 9:17 pm

I'll try and etch one of these boards and put it together for you :

https://picasaweb.google.com/lh/photo/jImbSQpzRVlrL40p1TdTYzp9CAWioUcOVgtonvvX5Vg?feat=directlink

CS

Andrew Burns
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Re: Micro-Hybrids

Postby Andrew Burns » Sun May 08, 2011 9:23 pm

Wow that's a super-thin flight computer, would be awesome to have one of those in there too!

strud
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Re: Micro-Hybrids

Postby strud » Sun May 08, 2011 9:50 pm

Yeah I figure that you can atleast get an acceleration log, giving you more data about motor performance.

Has reduced number of outputs etc but still has apogee and main output fets.

Serial port connection it at the top.

CS

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Re: Micro-Hybrids

Postby Kryten » Mon May 09, 2011 9:53 am

Looks very nice, Andrew.
What's its diameter & length?
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Re: Micro-Hybrids

Postby Andrew Burns » Mon May 09, 2011 10:58 am

About 26mm diameter and 780mm long.

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Re: Micro-Hybrids

Postby Andrew Burns » Tue Jun 07, 2011 11:19 am

Microhybrid was static tested once and flew 3 times over the weekend, unfortunately crashed on the last flight but performed perfectly on every occasion. The static test showed (from what I remember) that the motor was approximately an E24, the first flight with a warm nitrous bulb made it to 1075 feet, the second with a colder bulb made it to 991 feet. Both flights pulled about 7g's off the pad and overall the performance of the motor and rocket were respectable although the motor needs some re-design as the injector housing O-ring wasn't sealing very well most flights.

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Re: Micro-Hybrids

Postby strud » Tue Jun 07, 2011 11:51 am

Yes indeed I was impressed by the performance of the might micro hybrid rocket !

Why not put up a pic of the flight performance from the FC ?

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Re: Micro-Hybrids

Postby drew » Tue Jun 07, 2011 5:16 pm

I'll second that. Your Microhybrid was quite impressive! Well done Andrew.
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Re: Micro-Hybrids

Postby PK » Tue Jun 07, 2011 6:25 pm

Yep, hats off for turning what was a novelty, into a functional rocket motor!

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Re: Micro-Hybrids

Postby Space Mark » Tue Jun 07, 2011 6:29 pm

Personally, I thought the micro-hybrid was the best rocket there. It was a little different and a little quirky... I like that :)
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Re: Micro-Hybrids

Postby ROCKet STAR » Tue Jun 14, 2011 12:15 am

Witnessing just how incredibly well Andrew's 16g microhybrid flew last weekend was the kick up the backside I needed to get mine finished... So this weekend that's exactly what I did! :)

Image
16g microhybrid next to 8g microhybrid for scale.

Mine is very similar to Andrew's with regard to the injector and nozzle throat sizes as well as using the same fuelgrain material, so performance should be similar. The only notable difference it that I have used circlip closures (like the original microhybrid) instead of threaded closures.

Image

The other thing that I have done is to use a small eye bolt in place of a grub screw for initiating the bulb. I found that with my 8g microhybrid I always misplace the allen key, so this should negate that, as well as acting as an atachment point for a shock cord. Given that this will only be flying in a small rocket with a small parachute, I'm hopefull that there shouldn't be enough torque generated in the recovery harness to completely unscrew the eye bolt.

Image


I haven't static tested it yet, but hopefully I'll get a chance to next weekend.

Drag race Andrew? :wink:
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Re: Micro-Hybrids

Postby Andrew Burns » Tue Jun 14, 2011 6:16 am

Nice looking motor, yeah I think we'll need to be drag racing those when I get mine back from Perth and re-build it :wink:

Yours will be lighter than mine because of the circlip closures I guess...

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Re: Micro-Hybrids

Postby dosftw » Thu Jun 16, 2011 9:33 am

Andrew Burns wrote:Microhybrid was static tested once and flew 3 times over the weekend, unfortunately crashed on the last flight but performed perfectly on every occasion. The static test showed (from what I remember) that the motor was approximately an E24, the first flight with a warm nitrous bulb made it to 1075 feet, the second with a colder bulb made it to 991 feet. Both flights pulled about 7g's off the pad and overall the performance of the motor and rocket were respectable although the motor needs some re-design as the injector housing O-ring wasn't sealing very well most flights.


WOW Well done Andrew! 1000 ft is amazing! I would be incredibly interested in your hybrid design lol. I am currently planning for this Augusts launch, I would be happy if it left the launch pad again! But seriously, well done :)

Also roughly how much did the rocket its self cost you to produce?

Also RocketStar, I am looking forwards to hearing about your static test. Let us know how it goes :) This has definitely given me the rocketry bug big time again (Particularly the MH Bug) :P I cant WAIT to launch again in august :D
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strud
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Re: Micro-Hybrids

Postby strud » Fri Jul 01, 2011 6:22 pm

Hey Andrew, do you have any of the flight logs you can post ?

There's a function in George's software to generate a pic from the graph being displayed.

liam.mcquellin
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Re: Micro-Hybrids

Postby liam.mcquellin » Fri Jul 01, 2011 9:56 pm

Where does everyone get the graphite that is used for the nozzle?

Is there a specific type I should be looking for?

Thanks,


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