Enclosing an Evans Volksplane VP-2

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cluttonfred

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Good, I didn't want you to think I was questioning your suggestions, only that I am not really qualified to say what's safe and what's not.
 

cluttonfred

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Here's a quick sketch of an enclosed VP-2 with a Gardan Minicab-style forward-hinged canopy. In the stock VP-2, the fuel tank is integral with the forward fuselage decking, all fiberglass, I was thinking I might make a reinforced bridge in that decking just aft of the tank through which to bolt the hinges along with a gusset of sorts to spread the load down to the longerons. I could see using one or two billet hinges or perhaps about 24" of stainless piano hinge since the decking is flat on top. That would actually put the hinge point further aft than what I have shown, between the instruments and the tank rear bulkhead, and therefore the windshield angle would a bit steeper, but this is just an initial sketch.

enclosed vp-2.jpg vp-2 details sketch.jpg minicab_3v.jpg
 

don january

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With flat side's and top it would be easy to put a canopy like this one on the Taylor mono.taylor mono.jpg it would keep your weight down and IMO look better on the VP.
 

Tiger Tim

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The domed windscreens don't do it for me but a flat wrap windscreen with a big bubble canopy like a Canadian Chipmunk might be neat.
 

BJC

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This is a VP-1 but it's definitely not awful looking:
.... plus since it slides instead of hinging you can fly with the canopy open.
You could be correct, but not all airplanes with sliding canopies can be flown with the canopy open.


BJC
 

Twodeaddogs

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there's a new VP-2 video on Youtube and he has a very attractive forward sliding canopy, like the Robins and a high turtledeck. I also saw one which had a split side-hinging canopy like a Jodel 112, ie, light steel tube frame for the canopy and clad with 3mm Perspex. The VP-2 that I used to fly also had freely hinged underside gap seals for the ailerons, which improved their performance.
 

Twodeaddogs

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The first windscreen was two-person wide (full width of cockpit) but when it was realised that an 1834cc Vp-2 was no people carrier, the windshield was cut to about two-thirds width and the pilot sat in the centre. I often thought it could use Hurricane-style hinged doors to fill in the gap between the struts.
 

cluttonfred

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The VP-2 windscreen to plans is a little bit less than full width, basically the flat portion of the forward bulkhead between the rounded corners, because it is attached to the roll bar which is in turn attached to the forward strut attach points. See the plans here: http://www.wingsforum.com/aircraft/VP2/18.jpg. I have not seen a VP-2 with a windscreen only single-pilot wide, which would likely blow the wind right in your and your passenger's faces two-up. Even if it's not cross-country machine, that two-up capabililty for short hops is pretty much the whole raison d'être of the VP-2, unless you're of a size that you need that useful load for a single seater.

FritzW and I have discussed modifying the roll bar by making it a full circular curve at the top, but starting lower down, which would raise the height of the rollover protection a few inches and allow the windscreen to reach the top of the roll bar without a gap. I also thought about making the roll bar out of an aluminum rather than steel tube so it would be less likely to mess with the compass. The plans say "3/4 in dia x .06 in wall stl tube" so, assuming that tube would normally be mild steel or 4130, can anyone tell me what wall thickness and what common alloy I should use for similar buckling strength in a 3/4" diameter aluminum tube? I suppose non-magnetic stainless steel might also be an option, but I'd still need some help on the alloy and wall thickness.
 

FritzW

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IF I'm reading the LPDH tube chart correctly, you can't get there with 3/4" aluminum (2024), even solid. You'd have to go with 7/8" x .120 at twice the weight.

LPDH pg112.jpg

It might be easier to move the compass...
 
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