sxm_m Posted September 23, 2012 Share Posted September 23, 2012 hi, guys I'm building the airfix 48 sea harrier FA2. I try to replace the original rear exhaust nozzle parts, beacuse the shape was wrong. I have three choice, Aires, Palva and Heritage. Palva's shape also wrong. So I will not choose it. Heritage hase right shape, but it look not so good. :-( Aires's product has good detail and looks the shape is right, but it is for hasegawa AV-8B / Harrier II. I just wondering, is the Harrier II's rear nozzle same with sea fa.2? Thanks in advance! Link to comment Share on other sites More sharing options...
Julien Posted September 23, 2012 Share Posted September 23, 2012 FA2 Av-8B Link to comment Share on other sites More sharing options...
sxm_m Posted September 24, 2012 Author Share Posted September 24, 2012 ha, they look the same. thanks so much Julien. Link to comment Share on other sites More sharing options...
ChocksAway Posted September 25, 2012 Share Posted September 25, 2012 I think they only changed the front nozzles between Harrier I and Harrier II. Here's a couple of shots that may help with detailing the rears ... Harrier I (on FA2) ... and on the T.52 ... Harrier II (on GR9) Hope that helps? Link to comment Share on other sites More sharing options...
xffw45343tg Posted September 25, 2012 Share Posted September 25, 2012 I think the item between the turning vanes on the GR9 is a trimmer. These are used to balance the thrust and can vary from engine to engine. Kirk Link to comment Share on other sites More sharing options...
sxm_m Posted September 26, 2012 Author Share Posted September 26, 2012 I think they only changed the front nozzles between Harrier I and Harrier II. Here's a couple of shots that may help with detailing the rears ... Harrier I (on FA2) ... and on the T.52 ... Harrier II (on GR9) Hope that helps? thanks so much chocksAway! It's really helpful. Link to comment Share on other sites More sharing options...
depressed lemur Posted September 26, 2012 Share Posted September 26, 2012 A common theme on these photos is that the builders obviously neglected to use any filler on the underside wing joint. I assume they thought no-one would pick them up to look at the bottome side . Link to comment Share on other sites More sharing options...
The original Kit Builder Posted September 26, 2012 Share Posted September 26, 2012 Note that the nozzles on the big wing Harrier has one fewer guide vanes. If you look closely, you can see the third vane in the SHar/GR3 nozzle inside the outboard curve. Link to comment Share on other sites More sharing options...
ChocksAway Posted September 26, 2012 Share Posted September 26, 2012 Note that the nozzles on the big wing Harrier has one fewer guide vanes. If you look closely, you can see the third vane in the SHar/GR3 nozzle inside the outboard curve. This is a another angle on the GR5/7/9 nozzle ... so it also has the third vane to which you refer? it can also just be seen in the AV-8B nozzle in the post by Julien, if I've grasped correctly what you mean? Link to comment Share on other sites More sharing options...
xffw45343tg Posted September 27, 2012 Share Posted September 27, 2012 Is that not just another trimmer? (i.e. may or may not be there depending on the balance of the particular aircraft/engine). Link to comment Share on other sites More sharing options...
ChocksAway Posted September 27, 2012 Share Posted September 27, 2012 Kirk So what's a trimmer and what is a vane? And for the benefit of this thread - is there any "modellers" difference in the rear nozzles between 1st and 2nd generation Harriers? (I believe there's some real-life engineering differences in materials and fixtures). Confused - as ever over Harriers. Link to comment Share on other sites More sharing options...
xffw45343tg Posted September 27, 2012 Share Posted September 27, 2012 So what we need now is RB (newish member) who seems to have forgotten more Pegasus stuff than I'll ever know. But I'll stick my neck out until he (or some other grown up) comes along: The job of the vanes is to turn the efflux through 90 degrees whilst minimising thrust losses through turbulence/heat/noise etc. The trimmers help match the output fore and aft & left and right to keep the centre of thrust(?) within design limits. Too much thrust from the rear and the pilot will have to be balancing with pitch trim from the forward RCV all the time. No two engines give idential output so trimmers are added/taken away as a result of static & flight testing. Plausible? The only point of this to the modeller is that you can add pretty much whichever trimmers suit your mood - unless your model Pegasus actually functions as a turbofan. Kirk Link to comment Share on other sites More sharing options...
ChocksAway Posted September 27, 2012 Share Posted September 27, 2012 Plausible to me ... but looking at the photos above ... am I / are we looking at vanes, trimmers or both? Any chance you can point them out to me. Cheers Link to comment Share on other sites More sharing options...
xffw45343tg Posted September 27, 2012 Share Posted September 27, 2012 Don't think I can highlight without downloading and reposting the pics so I'll try the 1000 words route. See this hot nozzle below? From left to right it's vane, vane, trimmer. In the cold, you can only see vanes. And here? The trimmer is at the top of the shot between the vanes. Finally, here you can see the welded union between the vane and the nozzle and the fixing positions where the trimmers can be fitted. Thanks/acknowledgements to those whose posted pictures I borrowed. Whilst I'm being a smarty-pants, see those dimples in the surface of the vanes? The vane is constructed a bit like the really cheap doors you see in the DIY places; the outer skin is reinforced by a zig-zag within it which is welded(?) where it meets the skin. IIRC the material is titanium rather than hardboard, cardboard & glue but the principle is the same. As I said before, maybe a paid up sooty will come along in a mo and separate fact from assertion. Cheers, Kirk Link to comment Share on other sites More sharing options...
ChocksAway Posted September 27, 2012 Share Posted September 27, 2012 Kirk Thanks - clearer now! They are from my walkaround photos Link to comment Share on other sites More sharing options...
xffw45343tg Posted October 4, 2012 Share Posted October 4, 2012 And if you want something to check your model against, try http://www.ebay.co.u...=item1e72ef4ee2 Link to comment Share on other sites More sharing options...
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