andy paterson Posted November 8, 2021 Share Posted November 8, 2021 Can someone tell me why some tiger moths have a plate ontop of fus just before tail section and some don't , I believe it's on the 82a and will it cause a problem if it is not Kit is an old DB Tiger moth 58" Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted November 8, 2021 Share Posted November 8, 2021 Think they are anti-spin strakes - having them or not never effected any model Tiggy I have seen. Quote Link to comment Share on other sites More sharing options...
kc Posted November 8, 2021 Share Posted November 8, 2021 You can read about it here and probably many other books too. I reckon they probably look better without them and would be easier when covering the model. But scale is scale and one should fit them if the particular plane you model has them. Quote Link to comment Share on other sites More sharing options...
alan p Posted November 8, 2021 Share Posted November 8, 2021 Fitted to full size to assist in spin recovery , to help prevent said aircraft and crew tent pegging into the ground. Quote Link to comment Share on other sites More sharing options...
Gary Binnie Posted November 8, 2021 Share Posted November 8, 2021 No problem model-wise. They were fitted to promote spin recovery when laden with bombs (aft CG), other features of military Tiger Moths are slats and nav lights, most civilianised Tigers lost the nav lights. Quote Link to comment Share on other sites More sharing options...
Jonathan M Posted November 8, 2021 Share Posted November 8, 2021 Gary, are the 'slats' those things under the top wing LE in the last photo above - and what do they do? Quote Link to comment Share on other sites More sharing options...
Gary Binnie Posted November 8, 2021 Share Posted November 8, 2021 The slats are long thin aerofoil shaped strips of metal above the leading edge, you can just see the very forward portion where it curls under the wing. The black parts are covers for the pantograph type linkages, will see if I can find a better photo. The slats are automatic in operation and are moved in to the extended (open) position by the centre of pressure moving forward as the angle of attack increases (stall approach). There is a cable operated from the rear cockpit only that locks them in the closed position, used for intentional spinning and gusty landing approaches (to prevent asymmetric opening and rolling). They are also locked at the end of the landing roll as taxiing over bumps with them unlocked allows them to clatter in and out. They reduce the 1g stall speed by about 5 knots but there is a train of thought that the extra weight of them increases the stall speed by 5 knots!! What they do well is to transform the slow speed handling, with the slats out a mushy stall can be maintained with the stick almost on the back stop and will take some rudder and aileron mishandling, with the slats locked in (or a Tiger with no slats) the world will start to rotate very quickly! I believe that these slats were invented by Frederick Handley Page. Quote Link to comment Share on other sites More sharing options...
Gary Binnie Posted November 8, 2021 Share Posted November 8, 2021 Some photos: The linkage (three each side). Quote Link to comment Share on other sites More sharing options...
Jonathan M Posted November 8, 2021 Share Posted November 8, 2021 I thought that's what you meant, but wasn't sure until you showed the photo from above. Also I'd always assumed they were called slots (as in Handley Page slots) but are also apparently known as slats... I suppose the slats create the slots! Quote Link to comment Share on other sites More sharing options...
Gary Binnie Posted November 8, 2021 Share Posted November 8, 2021 Slots are fixed holes in the wing (Druine Turbulent) and slats move. Kruger flaps are panels on the lower surface that extend down and forward then take up a curved (aerofoil) shape by the hydraulic actuators bending the panel. The Tornado GR.1 had them along with a half closing undercarriage door system (also increased lift) but both systems were disabled (along with automatic wing sweep). Droops are the whole leading edge moving down (early F-4 Phantom, known as 'hard wing', late F-4E and F-4F have slats). I made some plastic slats for my 1/4 scale Tiger (non-functional) and I lost one on its maiden flight, made no difference to it! RAF Scampton, 1997. 4 Quote Link to comment Share on other sites More sharing options...
Geoff S Posted November 8, 2021 Share Posted November 8, 2021 1 hour ago, Gary Binnie said: I believe that these slats were invented by Frederick Handley Page. Ian Redshaws big Handley Page HP42 biplane airliner has leading edge slats which deploy automatically as air speed falls, which, I assume, is as the full size. It flies beautifully - or, as you'd expect, Ian flies it beautifully. I suppose they're the same as the ones fitted to some Tiger Moths. That Tiger Moth of yours is stunning btw. Is it scratch built or from a kit? Quote Link to comment Share on other sites More sharing options...
Gary Binnie Posted November 8, 2021 Share Posted November 8, 2021 Cheers, it's the Flair kit. Powered by an asthmatic OS120 FS, I came second with it at the RAFMAA champs scale comp that year. Wings are Solartex covered (10 metre roll) and the fuselage is Glosstex. Registration letters I made myself from Solartrim. Quote Link to comment Share on other sites More sharing options...
Outrunner Posted November 8, 2021 Share Posted November 8, 2021 Very nice Tiger Moth Gary, does it still exist? 1 Quote Link to comment Share on other sites More sharing options...
Gary Binnie Posted November 8, 2021 Share Posted November 8, 2021 Cheers, yes, it's hibernating! Fuselage is in the loft with two wings and two more wings are in a bedroom. Engine is in the shed. 'Pete' the pilot is a bit tatty now, I think the Latex isn't ageing too well. I derigged it earlier this year, the wings can be removed in pairs and a jury strut supports them at the root. The wings were taking up too much space so I undid the strut bolts and flying/landing wires (they are functional). This bench in the loft is now used for glider fuselages. Quote Link to comment Share on other sites More sharing options...
Outrunner Posted November 8, 2021 Share Posted November 8, 2021 One day....... Same with the Moth in my Avatar, I hope to bring it out of hibernation next spring. 1 Quote Link to comment Share on other sites More sharing options...
PeterF Posted November 8, 2021 Share Posted November 8, 2021 Heres my 1/4 scale Moth, I based mine on one of the prewar civilian planes that never had the strakes so it is correct without them. I have deliberately spun the model and it recovers OK without them. I have the slats made out of lithoplate but they are not functional. 4 Quote Link to comment Share on other sites More sharing options...
Eric Robson Posted November 9, 2021 Share Posted November 9, 2021 Some nice Tiger Moths here, the Me 109 sitting on the wing in the loft reminds me that they used Handley Page automatic slots. 1 Quote Link to comment Share on other sites More sharing options...
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