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Old 06-18-2013, 08:58 PM   #91
smchale
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Re: Aviation Design - Scorpion


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Originally Posted by TBrum View Post
I honestly don't know Sean! I just followed the advice to balance it like that and never checked against the 155mm! For reference, it'd be interesting if you could check what your's does when put in a wheelie

Trev
Ok, I'll check tomorrow. Finished the install tonight. Turned it on and nothing smoked. Lol.
I'll do the programming and test run it etc tomorrow.
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Old 06-18-2013, 09:43 PM   #92
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Re: Aviation Design - Scorpion

Hey Sean,

Mine is 28lbs as well with a paint job and the jb180. Flys great at this weight and slows down to a good speed for touchdown. The way Trevor balanced is correct and I seem to remeber 165mm but not sure. I do remember that my cg is on the backside of the main struts. Flying it for about 6 years now and still going strong.

Mike
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Old 06-19-2013, 05:38 AM   #93
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Re: Aviation Design - Scorpion

Thanks Mike, good feedback, and congrats on the long history with your scorpion!
155mm puts the location almost on the center of the strut in my case.
Before I get the upper tray in place, here are a couple pics of where I put the equipment.
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Old 06-19-2013, 05:39 AM   #94
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Re: Aviation Design - Scorpion

And another pic.
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Old 06-19-2013, 10:41 AM   #95
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Re: Aviation Design - Scorpion

Just completed some test runs in the driveway and everything checked out. The only exception being the nose wheel steering that is going to need some attention. Ugh.

Here's a couple quick clips:


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Old 06-19-2013, 10:42 AM   #96
smchale
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Re: Aviation Design - Scorpion

Another overall pic. Just sprayed that canopy so pics of that will have to follow later...
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Old 06-19-2013, 10:44 AM   #97
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Re: Aviation Design - Scorpion

The finish has only been taken thru compound sanding. It still needs polish and wax.

Here is the main access tray, only the essentials for a clean look.

Its amazing how dark this blue looks in the shade, but how light it is out in the sun.
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Old 06-19-2013, 10:48 AM   #98
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Re: Aviation Design - Scorpion

One area I deviated from the stock setup was with the turbine hatch. I didn't want the hatch connected to the fuse and left to flop around on the fuse during start up (although you can start with the hatch on and bake up, I'm just conservative and like to see what is going on during the start), and then risk that those exta few inches of air line would make contact with the hot turbine.

So I still ran the air cylinder but used a pair of air power quick connectors that have dual orings to seal on the hatch.
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Old 06-19-2013, 10:50 AM   #99
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Re: Aviation Design - Scorpion

So as the hatch slides on those connectors are engaged to let air pass thru.
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Old 06-19-2013, 10:54 AM   #100
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Re: Aviation Design - Scorpion

Trouble is there is no check valve to stop air escaping when the hatch is removed.
So I added a 4mm ball valve stepped down to 3mm under the tray to close off the 'brake closed' line. So once the hatch is installed after the turbine starts, opening that valve "arms" the brake. When the valve is closed and the hatch removed you hear a small brief pssft of air escaping but its only the air in the line between the valve and speed brake.
Works great, and no connections to be made or tubes flopping around!

Btw, the other two ball valves are for kero and smoke supplies.
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