Commercial motor recommendations

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strud
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Commercial motor recommendations

Postby strud » Tue Mar 01, 2011 8:41 pm

I'm considering shelling out for a decent sized commercial hybrid motor system.

Who out there has gone down this path and has any recommendations ?

I'm thinking K to M range impulse, and I'm not interested in Hypertek due to the GSE complexity.

CS

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Re: Commercial motor recommendations

Postby ROCKet STAR » Tue Mar 01, 2011 9:11 pm

strud wrote:I'm not interested in Hypertek due to the GSE complexity.


I recently bought a Hypertek system after exchanging a few emails with the guy at the University of Hertfordshire that came up with this...

http://www.rockets.herts.ac.uk/products.htm

He told me that they are not going to produce and sell them due to the fact that they wouldn't sell enough... but it would cost next to nothing to make and saves the GSE headache.
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Re: Commercial motor recommendations

Postby PK » Tue Mar 01, 2011 9:41 pm

I like these:

http://www.alphahybrids.com/

They're a chill and fill motor. A few more parts than I reckon they need, but the mechanism looks reliable to me..

The contrail stuff is crude. Their 75mm and larger motors are .. well .. just dumb..
With the price of NOX, I'd avoid anything with a vent.

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Re: Commercial motor recommendations

Postby PK » Tue Mar 01, 2011 9:53 pm

ROCKet STAR wrote:
strud wrote:I'm not interested in Hypertek due to the GSE complexity

...but it would cost next to nothing to make and saves the GSE headache.


And renders the motor non certified.

Hypertech GSE is cheap enough, easy to make, and the whole system is spectacularly reliable. It's just the PITA of having to rent that GOX tank that makes it unappealing
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Re: Commercial motor recommendations

Postby Sumo310 » Tue Mar 01, 2011 10:27 pm

I like the look of the pyro mod to the Hypertek gear, it seems so simple.

The larger Rattworks motors are probably way too long, and 64mm diameter. I don't know if SkyRipper make anything large than a 54mm motor? PK has covered Contrail.

As for Alpha Hybrids, this was posted back in september to the hybridrocketmotors list:
Alpha Hybrids will be closing out all inventory and halting production of motor hardware. We will still be producing reloads for our current customers. No need to panic about not being able to fly your hardware.

Thanks for the support!

Edward


This thread has reminded me, I have some GSE which needs finishing. Shane and I have been hoarding Hypertek gear for years, I'm sure we'll fly it by the end of this decade.... :roll:
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Re: Commercial motor recommendations

Postby Scoop1261 » Tue Mar 01, 2011 10:51 pm

I think it has to be either Hypertek or Contrail if you want Commercial in the K to M impulse.

I am by no means knowledgeable in this area, but from what I have heard the Contrail stuff is questionable in its advertised impulses and the systems are pretty "basic". If I remember correctly there was some robust discussion somewhere on this forum about the Contrail system, and I believe both PK & TP put up some very good points.

I here the Skyripper stuff is quite good, but I am not sure if the range stretches to what you are after.
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Re: Commercial motor recommendations

Postby PK » Tue Mar 01, 2011 11:04 pm

Sumo310 wrote:As for Alpha Hybrids, this was posted back in september to the hybridrocketmotors list:
Alpha Hybrids will be closing out all inventory and halting production of motor hardware. We will still be producing reloads for our current customers. No need to panic about not being able to fly your hardware.

Thanks for the support!

Edward



Bummer. Still, if they have gear left then it might be a good time to buy it..
This thread has reminded me, I have some GSE which needs finishing. Shane and I have been hoarding Hypertek gear for years, I'm sure we'll fly it by the end of this decade.... :roll:

:-)
Need a hand? A good friend manufactures an automotive ignition coil tester that'd be perfect for Hypertek GSE. I've got quite a few of his boards lying around..

PK

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Re: Commercial motor recommendations

Postby strud » Wed Mar 02, 2011 5:38 am

Hmmm, a little depressing really.

The rattworks M is quite awrkward in it's length but otherwise I really like the design and quality of his stuff.

Sumo how much effort is there is cycling your tribrid ?

CS

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Re: Commercial motor recommendations

Postby Sumo310 » Wed Mar 02, 2011 9:59 pm

By cycling, do you mean time between firing?

Prep should take about 15 minutes (I'm slow so take a lot longer), cleaning is about the same. You could easily get a few flights in per launch.
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Re: Commercial motor recommendations

Postby strud » Thu Mar 03, 2011 7:43 pm

Well after a bit of deliberation and a rush of blood I've bought the Rattworks L/M combination from Aerocon systems.

I'm thinking that it will mostly get used in the L600 config since M900 is rather a long beast and will require a special rocket to be designed around it.

CS

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Re: Commercial motor recommendations

Postby Sumo310 » Thu Mar 03, 2011 9:55 pm

Cool, 72" is a LOT of motor. Depending on how many flights you plan, you might want to grab an I115W, its the smallest 54mm white lightning motor for use as the preheater.

Come to think of it, I think theres a guy in NSW (Norm McG?) with the Ratt M, I'm not sure if he's met up with you guys?

Oh, and thanks for the offer PK, we "should" be right. If nothing has progressed in 6 months I might take you up on your offer :)
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Re: Commercial motor recommendations

Postby strud » Fri Mar 04, 2011 7:24 am

Sumo yes I will mostly be using it in the L config I think.

We have met up with Norm and his car load of rocket bits !

Sims suggest in L config, min diameter and minimal rocket mass it should see M1.4 and about 4300m. If I add a fai bit more mass the altitude should go up significantly, so maybe I should fly it in both configs at WWW and see what I get.

CS

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Re: Commercial motor recommendations

Postby Sumo310 » Fri Mar 04, 2011 10:23 am

Sounds good, if you need any AP grains for WWW let me know, I've got a bit spare.
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Re: Commercial motor recommendations

Postby strud » Fri May 13, 2011 6:08 am

Sumo can you measure the actual OD of your tribrid for me ?

I'm having a shipping disaster and need to make my motor mount and 3' airframe rear end this weekend even though the motor isn't here yet ! :evil:

The doco states 64mm but i obviously need to know more accurately than to the nearest mm.

CS

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Re: Commercial motor recommendations

Postby strud » Fri May 13, 2011 9:19 am

Just got infor from Dave Griffiths :

OD is 2.505" or 63.637mm

A bit of an odd size.....

Luckily I have a 63.5mm mandrel which I can use to make up a motor mount proir to the motor getting here....


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