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Old May 31, 2014, 10:11 AM
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Quote:
have you considered having two halves open on hinges with the gear down?
The Bell X-2 used an ejecting nose gear hatch, in an attempt to be true to scale Iím doing the same thing.

X30
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Old May 31, 2014, 10:12 AM
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Oops too late.


Richard
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Last edited by The Tellurian; May 31, 2014 at 07:38 PM.
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Old Jun 09, 2014, 10:51 PM
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Hereís a short clip of the nose gear hatch test with magnetic retention.
These tests were performed with the X-2 inverted.
The first test was done at 100 psi. The second one was done at 75 psi.
80 to 110 psi. is the normal range for this system.
This is much better than the friction fit I used last year.

X30

X 2 Hatch test 2014 (1 min 18 sec)
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Old Jun 10, 2014, 01:47 PM
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I'd say that system is a "go!"
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Old Jun 25, 2014, 05:29 PM
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The X-2 was on display at Warbirds Over Texas and it drew a lot of interest.
I also put up another flight on the ME-163
From the photos you can see that all of the burn damage has been repaired.
Jim Harris of Gorilla Rocket Motors is sending me a K-470 without the tracking grain.
This combined with the hardened skids, improved nose gear and hatch should address some of the minor issues I had last year.
I hope the weather at Black Rock is better this time.

X30
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Old Jul 14, 2014, 09:13 PM
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The current issue of Rockets Magazine features the Balls 22 launch and has an article about the X-2. If you donít get Rockets Magazine, itís in digital form and it's free. 
Just go to their website to set up an account at: 


http://www.libertylaunchsystems.com

They also have posted a number of their videos of that event on YouTube.
Hereís the one of the X-2

Dave


ROCKETS Magazine Dave Shaefer X2 (4 min 25 sec)
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Old Jul 15, 2014, 09:53 AM
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Excellent flight, excellent video!

I thought there was a bit of delay charge flame in the video, did the tail suffer any barbequing?


Richard
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Old Jul 15, 2014, 03:32 PM
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Quote:
I thought there was a bit of delay charge flame in the video, did the tail suffer any barbequing?
Yes, check out post #205.

Dave
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Old Jul 16, 2014, 02:52 PM
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That's the first time that I've watched it, but now I see the fire at the tail that caused you the damage repair. Wow! Where did you have the tracking grain positioned that it could cause that?
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Old Jul 16, 2014, 08:10 PM
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The position of the grain doesn't matter, its the blunt tail. A taper chopped off square like that causes what is called the Kamm Effect. Basically the air flows by as if there is a boat tail continuing beyond the actual end and the low pressure that now exists at the lopped off area eddies the flame around torching the rear.

Solutions could be to vent that area but the plane is already built so no to that. Make a sacrificial panel that is added only for the flight and removed for display. Last is to remove the tracking grain though a small amount of burning may still happen from the residual propellant as the main grain burns out.


Richard
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Old Jul 17, 2014, 11:18 AM
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Quote:
I see the fire at the tail that caused you the damage repair. Wow! Where did you have the tracking grain positioned that it could cause that?
Unlike the smaller AP motors, larger motors (full ďKĒ and above) often have very large tracking grains that enable you to track a rocket to extremely high altitudes.
These grains often burn for 30 seconds and they do burn hot. Jim Harris of Gorilla Rocket Motors is making me a spacer that will eliminate the tracking grain.


Dave
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Old Jul 17, 2014, 01:56 PM
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Good news--Don't want to have to rebuild, again. Thanks, for the primer, Richard.
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Old Jul 19, 2014, 05:51 PM
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A fix to the base cooking problem would be to add some little turning vanes to the area for flight. Just some 1/4 circle arcs, could be cut from phenolic body tube or something. They would mount on the back, sticking out into the airflow, and just force air into the base area. If you got rid of the suction area just above the engine, that should solve the problem. No need to do anything higher up on the tail.

I have not looked at this thread in a while, but the X-2 looks and flies really great!

Congrats!

Bob Parks
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Old Jul 21, 2014, 01:02 PM
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Always nice to see you in here, Parky! I got to see the X-2 in person on display at a local R/C event last month and the pictures and video do not to it justice. It is a work of art!

If he ever retires it, it would be worthy of display at NASM or a similar museum.
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Old Aug 10, 2014, 01:33 PM
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I received the Gorilla K-470 rocket motor from Jim Harris.
Jim cut down the liner and made a spacer to take up the room left by the missing tracking grain.
All of this fits together very well.
The first photo is the forward closure inset into the case. The next one shows the spacer and forward snap ring. The last shows the competed assembly.
This will prevent the tracking grain from producing a small flame out of the tailpipe for 30 seconds during the glide.


X30
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