DH Vampire 1/5th Scale prototype - Kit

Re: DH Vampire 1/5th Scale prototype - Kit

Postby DH100 » Thu Sep 18, 2014 1:35 pm

More work done on the tank set up. With all the hardware for the R/C Gear and the Turbine going towards the front it’s starting to become something of a serious scramble for space. I figured it best to get the tank situation sorted so set about making what ended up looking like a wooden puzzle for the two front main tanks. My objective is to have all the equipment mounted as modules that are easy to access and remove.
Forward.Tank.Mount.jpg

As part of this overall set-up, I made mountings for both the Turbine pump and the Hydraulic pump, both of which are to be located under each tank. These pumps will be cable-tied in place onto the dowels.
Fwd.Tank.Mount1.jpg

The tanks will also be secured to their mounting plates with cable ties. These are standard Dubro 24oz tanks with appropriate fittings and stoppers. At the front end the mounting plates are located with a tongue into slots in sub formers. The formers are braced forward to the main cockpit rear former.
Fwd.Tank.Mount.3.jpg


Fwd.Tank.mount.7.jpg

At the back, the tank plates locate onto two ¼ inch Nylon bolts, cut down and sides flattened and drilled to accept a long “Hair Pin” clip. These bolts are threaded into a 6mm ply base. So far so good.
DH100
 
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Re: DH Vampire 1/5th Scale prototype - Kit

Postby DH100 » Sun Sep 28, 2014 11:42 am

Still on with the tedious stuff of tank set up s and undercarriage systems. On the latter I have finally cracked it to my satisfaction. The UMSTech Hydraulic conversion is all set up on the test bed now. In my effort to have systems in modules, I spent some time playing around with a layout and came with what you see here. Basically all the Hydraulics are on this board. The board is tucked in above and ahead of the turbine and out of the way of the intakes. There will be a photograph of that later. Just to have it all working was a reason for a glass of Red.
Top side of the board here
Hydraulics Board Top.jpg

Lower side here
Hydraulics Board Under side.jpg

Dave Gladwin wrote an article on hydraulics in RCJI some time ago and one of his comments was that when setting up you need a good supply of paper towels and he is not wrong. However, once you know what you are doing (well partly) it all becomes easier. Basically, you need to be sure of the cylinders and you need to be sure of the integrity of the couplings. I’ve used Festo for all but the nipples on the cylinders. Their Push-ins and their Barbs are excellent, however any and all Barb fittings must be lock wired.
So now I have to attach the cylinders to the retract chassis. At the moment the cylinders are anchoured to the board and you can see the strain come on at the end of each cycle.
All this is significant progress. Its been something of a stumbling block for me.
See it all working at www.youtube.com/watch?v=yG9TcipySF8
DH100
 
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Re: DH Vampire 1/5th Scale prototype - Kit

Postby Warwick » Tue Dec 16, 2014 9:30 pm

Hi Brian,

Any updates? Looking forward to seeing the progress.
Warwick
 
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Re: DH Vampire 1/5th Scale prototype - Kit

Postby DH100 » Wed Dec 17, 2014 7:56 am

Hi Warwick
The Vampire has been off the bench for some weeks now while I do an overhaul on my Miles Hawk. It suffered and engine failure on take-off and some subsequent damage with nowhere to go but rough ground or a fence at the Nats last year and I put it aside "till later". (I missed the fence). It has got a bit late with the Nats looming so soon but I'm getting there with it and am itching to get back to my pet project!

Thanks for keeping the faith!

Brian
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Re: DH Vampire 1/5th Scale prototype - Kit

Postby Warwick » Wed Dec 17, 2014 7:25 pm

Thanks for the update Brian, will wait patiently for the next post. Have a merry Christmas
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Re: DH Vampire 1/5th Scale prototype - Kit

Postby DH100 » Wed Dec 17, 2014 8:47 pm

Merry Christmas to you too Warwick. Further progress is not far off.

Thanks again.

Brian B
DH100
 
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Re: DH Vampire 1/5th Scale prototype - Kit

Postby DH100 » Tue Feb 24, 2015 6:17 pm

Finally the Vampire is back on the board for the first time since September last year. So, I have fitted the converted hydraulic retract set up to the model and the moment of truth arrived. I can report so far, so good. I have a one minimal leak primarily due to the tube being used and I expect this to pretty much be alleviated when the installation is properly set up. I watched the first retract cycle with some trepidation but was pleasantly surprised with perfect operational performance.
Nose.Leg.cylinder.mounting.jpg


I decided to re-jig the nose cylinder mounting arrangement and I also took the lead from the full size regards the bracing on the nose leg chassis mounting as well. It’s a little agricultural looking but it will be a great belt-and-braces arrangement for the entire system. The converted system does impose an interesting amount of force on things and I have bought a Festo pressure gauge to fit to the system. It will be interesting to see if it tops out at around the 150 PSI claimed in the manufacturers blurb!
The next step will be to complete the actual setup, improve the engineering of the steering link on the nose leg and get to some serious finishing. I have a target for which to aim – no – a commitment in fact!
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Re: DH Vampire 1/5th Scale prototype - Kit

Postby DH100 » Wed Feb 25, 2015 3:48 pm

I have tarted up and introduced some additional bracing on the rear side of the front former. There are still some adjustments to do on the closure of all the doors and as we all know they will almost certainly be on-going. The link below shows it in and working on the model for the first time.

http://youtu.be/2_xzUvL74K8
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Re: DH Vampire 1/5th Scale prototype - Kit

Postby Warwick » Wed Feb 25, 2015 8:40 pm

Good to see you back again Brian.
Warwick
 
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Re: DH Vampire 1/5th Scale prototype - Kit

Postby Warwick » Wed Feb 25, 2015 9:07 pm

My Kerry Sterner 1/4 vampire maiden last week. It flies very well but floats!! Notice I have left out the word scale after following your build.

http://youtu.be/gSr_li-5ADs
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