Steve Withnell 1 Posted November 2, 2011 Share Posted November 2, 2011 I'd prefer a kit, but scratch build from plan is fine. I'd like "power in hand" with an average .60FS. Nothing marginal. Standoff scale is fine, I'm not planning (or have the skill or patience) to produce one of those magnificent scale models some guys turn out! I've seen big 'uns and little 'uns but nothing in the middle! Thanks Steve Quote Link to comment Share on other sites More sharing options...
Lazygit Posted November 2, 2011 Share Posted November 2, 2011 Take the plan along to a print shop and get it enlarged/reduced to the size you want. Simples. Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted November 2, 2011 Share Posted November 2, 2011 I was looking at this recently - I like the prototype myself. This is what I came up with: This one 72" span designed for a 60 2st I suspect. Might be a bit marginal on a 60FS - but not necessarily - modern 4st aren't that far behind the "cooking" 60 2st of the past these days. This one but its too small as it stands - however enlarged by about 25% it could be perfect. And finally this one which is silly big - but at about 50% might be OK though possibly a tad over powered with a 60FS - but the throttle works both ways! BEB Quote Link to comment Share on other sites More sharing options...
Steve Withnell 1 Posted November 2, 2011 Author Share Posted November 2, 2011 So get the 72 inch plan (By DB) off to the print shop scale it down to about 56 inch span should be about it? My .60 FS will not be hot, but average. Thanks guys very helpful. Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted November 3, 2011 Share Posted November 3, 2011 Yeah, I'd consider a scale down to about 60". I fly my 53" span Pitts Special (which is very heavy!) off an OS56Alpha and that has plenty of power - more than you would want in this model I would suggest. Having said that the Avro will be very draggy - more so than the Pitts. So, yes I think 56-60" would give you a nice size model that will fly fine with a 60FS up front. Let us know how you get on - a build blog would be nice - as I say I like the prototype myself - its on my "to do" list, the trouble is so is half the history of British aviation pre 1950! BEB Quote Link to comment Share on other sites More sharing options...
Steve Withnell 1 Posted November 3, 2011 Author Share Posted November 3, 2011 Thanks - easy bit done, I've ordered the David Boddington 72" Plan. My intent is to build it as a 548a, as far as I can tell (at stand off scale) only the engine bay / front fuze was changed. I won't start building this until spring if all goes well, as I have a related project to (related to the 548 build) to complete first and it's a major challenge, which is why I need the plan well ahead of the build of the airframe. I'll share that blog build once I know I can deliver. Steve Quote Link to comment Share on other sites More sharing options...
Steve Withnell 1 Posted November 5, 2011 Author Share Posted November 5, 2011 Plans arrived today - what a buzz going through the detail! What was disappointing was these really nice plans (£22.50) folded to A4 and mailed in a plastic bag. Perhaps I should send "My Hobbystore" an invoice fr the ironing! A long while since I built from plans, but it's all dropping into place, looks like bags of room for my motor and I can see it should be straightforward to make the version changes. Steve Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted November 5, 2011 Share Posted November 5, 2011 Yes, its always one of the best bits isn't it the pouring over the plans whilst sipping a coffee - seeing how it all goes together and working out your "plan of attack"! BEB Quote Link to comment Share on other sites More sharing options...
Brian Parker Posted November 6, 2011 Share Posted November 6, 2011 Candidate for the Whittle V8 perhaps?Edited By Brian Parker on 06/11/2011 09:06:41 Quote Link to comment Share on other sites More sharing options...
Steve Withnell 1 Posted November 6, 2011 Author Share Posted November 6, 2011 At the minute I'm struggling to drill a 5.3mm hole 2.85 inches deep, I'm trying to get the runout below 0.1mm, Eric Whittle managed to get the hole true, so that's got to be the target, I don't think I can afford an accrual of small errors on an engine this small and complex- so might it might be a while! Anyway now I've got the 504 plan that'll give me more motivation to press on...the front fuze mods from 504 to the 548a seem reasonably straight forward. In the meantime I have 547 engine bits left to make Anyway - off to the shed to sort that deep hole! Steve Edited By Steve Withnell 1 on 06/11/2011 10:08:53 Quote Link to comment Share on other sites More sharing options...
Brian Parker Posted November 6, 2011 Share Posted November 6, 2011 Steve, That’s 547 components left to go before you start tapping 10 and 12 BA. It could go up. I’ve Eric Whittles build notes and also have had the A1 size drawings from Hemingways for some time but lack the courage to make a start. Good luck with the project. Quote Link to comment Share on other sites More sharing options...
Steve Withnell 1 Posted November 6, 2011 Author Share Posted November 6, 2011 I made the crankshaft first, that's probably the most demanding component in terms of time and patience. Mick Knights has published his build of a x2 version in ME. I seem to remember it took Mick (as a real machinist) 18 days to turn the crank. I certainly can't build this to a deadline, it just has to happen when it happens. Yes the tapping of so many 10 & 12 BA holes (and tapping out 14bA nuts @12BA!!) is something to look forward too (NOT), but I'm sure it will be character forming. I was going to build David Parkers Vega Twin, but then I thought I might as well go the whole hog and build one of the real classic engines. My engine blog is here: http://whittlev8.wordpress.com Quote Link to comment Share on other sites More sharing options...
Brian Parker Posted November 6, 2011 Share Posted November 6, 2011 Thanks Steve, I’ve had a look at your Blog and I am following Mick Knights build in M.E. Quote Link to comment Share on other sites More sharing options...
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