Phil.Taylor Posted June 24, 2019 Share Posted June 24, 2019 The Voltij flies great - really agile & real precision aerobatics (*) - but its no speed demon with the fat fishy fus & thick blunt section fin. I sometimes wonder how it would fly if it were skinny - ok, no knife edge, but probably more speed & energy for other moves - with of course the symmetrical MG05 camber changing airfoil. Then... a cheapo Typhoon fus appeared on fleabay last week - had to be done! So - its now a "project" - which just might take a while - because the Typhoon fus is missing the fin - presumably the boom broke, as they do, then a previous owner had a go at making it v-tail (i.e. bodge). I've got the rear end of a cross tail Crossfire which I can graft onto it, may be a bit oversized though - anyone got a Typhoon fin from a trashed Typhoon maybe? (will post a wanted ad too) Comments welcomed - heckling - beer - whatever... Phil. (* now with a crazy mad-stab setup for flip loops - but that's another story...) Link to comment Share on other sites More sharing options...
SilentPilot Posted June 24, 2019 Share Posted June 24, 2019 Should go like a Minivec Link to comment Share on other sites More sharing options...
MikeDaBike Posted June 25, 2019 Share Posted June 25, 2019 I've got one I think in yellow ather the fuselage snapped just before the tail. Will take a look this evening when I get home Link to comment Share on other sites More sharing options...
stewartg Posted June 25, 2019 Share Posted June 25, 2019 I agree the fuz and fin look draggy but they say that 90% of drag is the wing so it will be interesting to see what difference a skinny fuz makes An Aresti has far less side area than a Voltij but doesn’t seem to suffer in knife-edge, I think it’s about momentum and energy retention as the Aresti wing loading is likely to be higher than the Voltij Do you have a ballast tube in your Voltij by any chance, the only way I can add weight to mine is with steel wing joiners and that only adds about 5oz and the wings bend enough with high G Aeros as it is Wonder how to make the wings stiffer? Link to comment Share on other sites More sharing options...
Phil.Taylor Posted June 25, 2019 Author Share Posted June 25, 2019 4 hours ago, MikeDaBike said: I've got one I think in yellow ather the fuselage snapped just before the tail. Will take a look this evening when I get home Thanks Mike ! Phil. Link to comment Share on other sites More sharing options...
Phil.Taylor Posted June 25, 2019 Author Share Posted June 25, 2019 4 hours ago, stewartg said: I agree the fuz and fin look draggy but they say that 90% of drag is the wing so it will be interesting to see what difference a skinny fuz makes An Aresti has far less side area than a Voltij but doesn’t seem to suffer in knife-edge, I think it’s about momentum and energy retention as the Aresti wing loading is likely to be higher than the Voltij Do you have a ballast tube in your Voltij by any chance, the only way I can add weight to mine is with steel wing joiners and that only adds about 5oz and the wings bend enough with high G Aeros as it is Wonder how to make the wings stiffer? Yep - Aresti is heavier & more heavily loaded (from what I've read) Yep - I also use steel wing joiners for that little-bit-extra - have flown it in 50+mph winds - ballast would help energy, but at the risk of destroying the wings, which are built light with no spar. Phil. link below - flying in a 55mph wind - flying was ok, launching wasn't - crazy... Link to comment Share on other sites More sharing options...
Sloper Posted June 25, 2019 Share Posted June 25, 2019 Odd i always thought the VoltiJ was quite quick but the fuz was awfully prone to breaking i remember Carpet Pete flying one in an F3F at HOH and getting a 42xx on par with the rest of us with our f3f kit Link to comment Share on other sites More sharing options...
wookman Posted June 25, 2019 Share Posted June 25, 2019 All other things being equal, a skinny fuz will make a considerable difference. More speed and energy due to reduction in drag. I am surprised that 90% of drag comes from the wing! Link to comment Share on other sites More sharing options...
SilentPilot Posted June 25, 2019 Share Posted June 25, 2019 Total drag (including lift induced) maybe upto 90% from the wing but I can't see it being a large proportion of profile drag. Link to comment Share on other sites More sharing options...
Phil.Taylor Posted June 25, 2019 Author Share Posted June 25, 2019 https://en.m.wikipedia.org/wiki/Parasitic_drag https://en.m.wikipedia.org/wiki/Lift-induced_drag Link to comment Share on other sites More sharing options...
Woodstock Posted June 27, 2019 Share Posted June 27, 2019 The Vj definitely has a rather sedate terminal speed. But, I rather like that: it puts you in a different flying frame of mind.. I re-built my fuzz with a very heavy layup after a number of crashes, and used it thereafter only for strong conditions. The heavy version didn't go any faster... Link to comment Share on other sites More sharing options...
Phil.Taylor Posted July 15, 2019 Author Share Posted July 15, 2019 The appeal for fin parts came up good - many thanks Mike ! So - a bit of action with a hacksaw to remove the messy bodged end of the fus - and a trim down & tidy up of the tailboom part - then the tail part fits over the front part - simples! Quick mock-up "garden fly" - looks promising - tailboom is a bit long because of the join overlap - but should make it track nicely Phil. 2 Link to comment Share on other sites More sharing options...
Nigel_W Posted July 15, 2019 Share Posted July 15, 2019 Fantastic idea, looks way better than the Voltij. Planning on having dihedral to make landing safer? Link to comment Share on other sites More sharing options...
Phil.Taylor Posted July 15, 2019 Author Share Posted July 15, 2019 Thanks! dihedral? - nope - its a flattie - same ways up & upside down 1 Link to comment Share on other sites More sharing options...
SilentPilot Posted July 15, 2019 Share Posted July 15, 2019 Put the dihedral on a Servo Link to comment Share on other sites More sharing options...
oipigface Posted July 16, 2019 Share Posted July 16, 2019 How about making the fuselage profile deeper, so that it will knife-edge better? 1 2 Link to comment Share on other sites More sharing options...
Nigel_W Posted August 14, 2019 Share Posted August 14, 2019 On 24/06/2019 at 21:18, Phil.Taylor said: Comments welcomed - heckling - beer - whatever.. Any chance we might see this on the weekend at White Sheet? Link to comment Share on other sites More sharing options...
Phil.Taylor Posted August 15, 2019 Author Share Posted August 15, 2019 9 hours ago, Witch_1 said: Any chance we might see this on the weekend at White Sheet? No more progress - big house DIY project has got in the way I will have the Nyx though Phil 1 Link to comment Share on other sites More sharing options...
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