A.A. Barry Posted June 14, 2015 Share Posted June 14, 2015 Well, another of Petters plans, along with the Wagtail, Wessex, Whirlwind, Welkin and Wyvern is this little pretty biplane. I never got into production as ir was too slow for the hierarchic , but I think it would make a lovely E.P model, around 12/1500mm 2 prototypes where made and first flew in 1934.. there is more info on the web plus pics Check it out A drawing to come Edited By A.A. Barry on 14/06/2015 01:14:34 Quote Link to comment Share on other sites More sharing options...
A.A. Barry Posted June 14, 2015 Author Share Posted June 14, 2015 The only hard bit it would be the "gull type" top wing multiply the drawing by 6 and ya get a 1200mm span (of the webb) Cheers Barry Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted June 14, 2015 Share Posted June 14, 2015 Hi Barry. I think you mean "F7/30", the specification that produced a number of interesting prototypes, including the Supermarine 224 and Bristol 133. The Westland attempt is very attractive. It's unusual feature is the Airacobra like engine position for the Rolls Royce Goshawk behind the pilot, driving the prop through an extension shaft. Although it didn't meet the performance specifications, it is a nice looking plane and I've never seen it modelled before. Perhaps the difficult bit will be getting the cg right with that very short nose. You wonder how they got it right on the original, unless the extension shaft to the prop was very heavy! I bet you've already made a start on it, good luck. If you are doing what I tend to do, which is part way through a long build do a diversion on to something simple and "quick", I generally find out that it takes longer than I thought it would, but that's largely because of limited time and I'm slow anyway. Quote Link to comment Share on other sites More sharing options...
A.A. Barry Posted June 14, 2015 Author Share Posted June 14, 2015 Colin, nup I have only just thought about it, Whirlwind to finish and then the Welkin ... C/G... I thought a 36"/ 42" W/S and the battery underneath the cockpit floor, stringers from "D" backwards, not shown on this drawing ( behind lower wing fixing)... tissue covered, simple box ft fuz with light sheeting around secondary formers.Tail feathers soft sheet Looking at the full size the engine is directly under the C/G... I think, so they must have done their homework on that What'd think?? Barry Quote Link to comment Share on other sites More sharing options...
A.A. Barry Posted June 14, 2015 Author Share Posted June 14, 2015 here's another pic Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted June 14, 2015 Share Posted June 14, 2015 Sounds good to me Barry, you'll need to keep the back end light though. Using a built up structure with tissue covering as you intend makes it possible though, I guess. I think it's a great idea. There are so many of these prototypes that aren't well known, but make fantastic model projects, there's no doubt about this one having loads of character. Quote Link to comment Share on other sites More sharing options...
A.A. Barry Posted June 14, 2015 Author Share Posted June 14, 2015 It seems like I got the title wrong, it was given proviso name of PV4, the p7/30 is the specification on which it was submitted, see Colin's post a little further back.....maybe a moderator can fix that.... thanks Colin Barry Edited By A.A. Barry on 14/06/2015 11:23:28 Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted June 14, 2015 Share Posted June 14, 2015 No bother Barry, I'm sure it can be edited if you wish. Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted June 14, 2015 Share Posted June 14, 2015 I don't know if a mod has seen this yet, Barry is looking to get the thread title changed to F7/30, I think. Quote Link to comment Share on other sites More sharing options...
A.A. Barry Posted June 14, 2015 Author Share Posted June 14, 2015 Thx Colin, but it should be titled .....Westland.PV-4 Barry Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted June 14, 2015 Share Posted June 14, 2015 What a pretty little aeroplane! Somebody build it quick! tim Quote Link to comment Share on other sites More sharing options...
Tony Richardson Posted June 14, 2015 Share Posted June 14, 2015 Get on it Tim quick, Pleeeease Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted June 14, 2015 Share Posted June 14, 2015 Posted by Tony Richardson on 14/06/2015 20:02:04: Get on it Tim quick, Pleeeease Sorry Tony - another project just started! tim Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted June 14, 2015 Share Posted June 14, 2015 Sorry Barry, wrong end of stick! I don't know why Westland called it PV4 though, even though they did. It usually means "Private Venture", the Hawker contender (PV3) and the victorious Gladiator were both in that category. The Westland contender was absolutely targeted at F7/30, so doesn't seem to have been a private venture, but a response to a government contract. There must be an answer! It looks as if you have got Tim interested, so it has to be a good prospect. Quote Link to comment Share on other sites More sharing options...
A.A. Barry Posted June 14, 2015 Author Share Posted June 14, 2015 Exellent news Colin.... Quote Link to comment Share on other sites More sharing options...
A.A. Barry Posted June 14, 2015 Author Share Posted June 14, 2015 I've crunched a few numbers, starting with the fuz ....side view using the sysbols on the drwg x 7:- W/S ...( top ) ....1360 mm width 200 mm A = 80 mm B = 158 mm C = 187 mm D = 155 mm E = 81 mm A to B = 84 B to C = 112mm C to D = 252 D to E = 287 E to rear = 273 mm there should be enough space behind B to fit a good size 3s, or shift B forward if required, because A is 80 mm (spinner ), this could also be reduced and by making A 70 mm, you could gain an extra 20 mm between A and B width of B & C 126 mm " " D = 110 mm, E = 56 mm So they all look feasible Barry Quote Link to comment Share on other sites More sharing options...
ROY DAVIES 1 Posted June 15, 2015 Share Posted June 15, 2015 Looks like an overgrown Short Seamew ! Pretty in a strange kind of way and quite interesting. Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted June 15, 2015 Share Posted June 15, 2015 Posted by ROY DAVIES 1 on 15/06/2015 00:12:27: .... like an overgrown Short Seamew ! That's just what I thought too. tim Quote Link to comment Share on other sites More sharing options...
A.A. Barry Posted June 18, 2015 Author Share Posted June 18, 2015 I got a bit keen on this and drew up a wing rib,.... nothing special,but looks OK Colin, I also revised your Welkin wing rib, what do think??, I reckon the L.E could be lowered a mm or 2 so as to give a higher profile Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted June 18, 2015 Share Posted June 18, 2015 Big fin, tiny tailplane. I reckon that on a 60" model you'd get a 5S pack vertically behind the motor....... Spinner could be awkward though. tim Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted June 18, 2015 Share Posted June 18, 2015 Hi Barry. Sorry I'm a bit slow in replying. I think you've got plenty of scope in the wing section for altering to semi-symmetrical. As I mentioned, I drew it flat bottomed as part of keeping the stalling speed low for hand-launching, it might not have been necessary. The key thing is that the thickness is scale, so to avoid going too thick, you need to reduce the camber on the upper surface and it looks as if you've done this. By the way I've found a copy of Aviation News from November 1993 on Ebay which has a feature on the PV4. I've bought it and it should arrive tomorrow. Let's see if it tells us something new. If it's any good I will copy it to you. I'm still intrigued why it's called PV when it's not generally considered to have been Private Venture. The previous Westland biplane was the PV3 and it definitely was Private Venture. Quote Link to comment Share on other sites More sharing options...
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