Derek B Posted October 4, 2014 Author Share Posted October 4, 2014 Edgar's still a member, and still visits, he just doesn't post any more. Kev Thanks Kev - Post amended accordingly. Derek Link to comment Share on other sites More sharing options...
Derek B Posted October 4, 2014 Author Share Posted October 4, 2014 From L to R: Hasegawa Spitfire Vb kit prop, Revell Spitfire IIa kit prop and Revell Hurricane I kit prop. Revell Hurricane Rotol prop offered up to the Revell Spitfire kit. Comparing it to the above photographs of the aircraft, the spinner is too large in diameter and too long in length. The propeller blades are too wide in chord and the root cuffs are also located too far from the spinner blade cut outs. Measurement of the base plate diameter of the Rotol prop came out at 21.6mm, so needed reducing in diameter by 2mm. The average length of both the Hasegawa spinner and the Revell kit spinner was in the region or 16 - 16.5mm and the Revell Hurricane Rotol prop spinner was 19.6mm long, so needed reducing in length by 3mm. Below is the sequence of events I elected to use to do this. This is only one of several ways of achieving the same end result and I have probably chosen the hardest one! (this evolved 'organically' as I did not have all of the data and reference that I needed before I started). The two scribed lines either side of the spinner rivets indicates the 2mm band of material that needs to be removed in order to reduce the length of the forward part of the spinner. The scribed line at the back of the base plate indicates the 1mm width that needs removing to reduce the base plate length. 3mm removed from Rotol spinner length. Reducing back plate diameter to 19.5mm (reduction of 2mm in diameter). Link to comment Share on other sites More sharing options...
Derek B Posted October 4, 2014 Author Share Posted October 4, 2014 Comparison to Hasegawa prop back plate diameter. unmodified and modified Revell Hurricane Rotol spinner backplates showing reduction difference. Spinner shortened and back plate reduced in diameter. Spinner step sanded and smoothed to correct shape. The Spitfire Rotol CS prop is 10' 3" diameter. The DH CS VP prop is 10' 9" diameter, so the Revell kit Rotol prop need the diameter reducing at the tips by 2mm to be correct to scale (unmodified, it as approximately the same diameter as the Revell Spitfire kit propeller. Marking out the 2mm tip reduction. Link to comment Share on other sites More sharing options...
Derek B Posted October 4, 2014 Author Share Posted October 4, 2014 Blade tips cropped by 2mm. Removal of the moulded blade root rings. Based on drawings and photographs, I made a tracing paper template and drew the correct blade shape onto the kit prop blades - two of the blades have been roughly shaped. Although difficult to tell here, the propeller is now the correct diameter. The outer blades have been roughly shaped and the tips rounded. The blade root cuffs need to be modified and built up before the blades can be thinned, fully shaped and formed - more to follow in due course. Derek D.B. Andrus 1 Link to comment Share on other sites More sharing options...
LSP_Kevin Posted October 4, 2014 Share Posted October 4, 2014 Mind-boggling work Derek! I got lost about half-way through, but it looks like things turned out pretty well in the end! Kev Derek B 1 Link to comment Share on other sites More sharing options...
Loic Posted October 4, 2014 Share Posted October 4, 2014 Some very find work mate ! I like your attention to detail Derek B 1 Link to comment Share on other sites More sharing options...
desmojen Posted October 4, 2014 Share Posted October 4, 2014 Fair play, that's coming out nicely. I would err on the side of stumping up £4 to Bob at MDC though! Jen. Derek B 1 Link to comment Share on other sites More sharing options...
Artful69 Posted October 4, 2014 Share Posted October 4, 2014 As we say in a good old Aussie game of Two Up ... "Come in Spinner!!" Rog Derek B 1 Link to comment Share on other sites More sharing options...
Anthony in NZ Posted October 4, 2014 Share Posted October 4, 2014 (edited) Wow great stuff Derek! Good to see you have the master Edgar helping you out....he is a great guy. Has been a tremendous help with several drawings and data on my Auster T7 rebuild. Loving the type of work you do. Cheers Anthony Edited October 4, 2014 by Anthony in NZ Derek B 1 Link to comment Share on other sites More sharing options...
Derek B Posted October 4, 2014 Author Share Posted October 4, 2014 Fair play, that's coming out nicely. I would err on the side of stumping up £4 to Bob at MDC though! Jen. I expect that is what most will do Jen Derek Link to comment Share on other sites More sharing options...
Guest Peterpools Posted October 4, 2014 Share Posted October 4, 2014 Derek Amazing ... just amazing Keep 'em coming Peter Link to comment Share on other sites More sharing options...
Derek B Posted October 6, 2014 Author Share Posted October 6, 2014 (edited) A little more progress... Blade extension parts cut out. Required (matching) areas cut awat from prop blades and inserts glued in. Super (Cynoacrylate) glue/talc mix added to insert joints. The inserts, once fully dried, will be filed and sanded to match the existing blade aerofoil shape, but will be left oversize. The new profile shape will be transferred onto the blades and they will be shaped to match. The following phase will be the addition of metal base rings to the blade roots and the build up of the root thickness for about 1/3 of the blade length. Once this is complete, the the final shaping and refining of the blades can begin. Derek Edited October 6, 2014 by Derek B Link to comment Share on other sites More sharing options...
Loic Posted October 6, 2014 Share Posted October 6, 2014 I like what you are doing here mate Derek B 1 Link to comment Share on other sites More sharing options...
JRutman Posted October 6, 2014 Share Posted October 6, 2014 Nice to see how you are tackling this problem. J Derek B 1 Link to comment Share on other sites More sharing options...
Derek B Posted October 6, 2014 Author Share Posted October 6, 2014 Nice to see how you are tackling this problem. J Thanks J. Nothing special, just the application of good old fashioned modelling skills - nothing more. Derek Link to comment Share on other sites More sharing options...
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