Graham Davies 3 Posted March 24, 2021 Share Posted March 24, 2021 Can I just endorse Richard's comments. I too wanted the full chips and rice experience, but Richard advised a simpler approach in order that my first warbird experience was a successful one. Hence my Tempest has fixed undercarriage and no flaps. It weighs a little over 5lbs and flies really well. My strip also has a pronounced gradient, and stopping my 6lb+ acrowot causes the same issue you have. My Tempest kisses the ground like a tender lover! Go simple, go light, and you'll be right... Quote Link to comment Share on other sites More sharing options...
David Hazell 1 Posted March 24, 2021 Share Posted March 24, 2021 41 minutes ago, Graham Davies 3 said: My Tempest kisses the ground like a tender lover! Go simple, go light, and you'll be right... Winner of quote of the week right there!! Thank you gentlemen. I'll ditch the flaps and dither no more. This being my first scale model n all... I can make progress again now!! Quote Link to comment Share on other sites More sharing options...
Eric Robson Posted March 24, 2021 Share Posted March 24, 2021 No flaps on mine and it fly's great, mind you the wind where I fly is the flaps, it is high up and very rarely calm. chasing scale perfection in a sport scale aeroplane will drive you mad because it can't be achieved. The inner flaps are angled up to the centre on the real thing as there is a slight gull wing on the full size and the dihedral starts away from the centre but it is not apparent on the Warbirds model. Best thing is to build it as designed and follow Richards and Pauls advice on finishing and you will have a good flying replica of a Spitfire. Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted March 24, 2021 Share Posted March 24, 2021 A quick question about retracts if you don't mind me popping into this thread? I have one of these kits squirreled away while I re-configure the workshop. I bought the motor with it but no retracts. I have some JP 90deg electric ones that look the perfect size. Will 90deg do the job or do I need something else? Quote Link to comment Share on other sites More sharing options...
RICHARD WILLS Posted March 24, 2021 Share Posted March 24, 2021 90 degrees is fine for the Spitfire Chris . 1 Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted March 24, 2021 Share Posted March 24, 2021 Brilliant, thanks for the reply. Quote Link to comment Share on other sites More sharing options...
Andy Gates Posted March 25, 2021 Share Posted March 25, 2021 I thought I had sorted out the wing wiring in a really neat way using a Multiplex connector - see attached picture. That plug and socket runs 2 individual aileron channels, flap, and U/C. Maybe not so clever I now realise, my receivers are sbus compatible so all I need is a sbus decoder and I can connect the wing with a single servo wire! Decoder now ordered. Paints have now turned up too. Quote Link to comment Share on other sites More sharing options...
David P Williams Posted March 25, 2021 Share Posted March 25, 2021 Are you using Frsky receivers and Sbus decoder Andy? If so, are you aware that the servo signal output on Sbus from the Receiver is 9ms rather than the 20ms on the standard output pins, and the decoder doesn't alter this. You must use digital servos at that signal frequency, it will fry analogue ones. I've no idea if the electric retracts will handle it either. Quote Link to comment Share on other sites More sharing options...
Andy Gates Posted March 25, 2021 Share Posted March 25, 2021 (edited) Hi David, Yes / maybe to the Frsky receivers, I have a Jumper one to play with too. Decoder coming is a Frsky one with 4 channel output. I had read about the timing differences, but again there are conflicting reports on the internet of the issues this causes. I have just double checked and the decoder I have coming matches the timing to whatever the receiver outputs which is controlled by the receiver firmware. Depending on which receiver is in use, this can be 21-27ms according to the instructions. I have some old analogue servos to try it on and a digital one, and the same for electric retracts and ESC's. Much testing to do, which means it may not end up on the Spitfire if the results are inconclusive. My next project is probably another scratch built lightweight Lancaster, so these test may result in the use of decoders and digital servos in that to help reduce interferance and wire volume. Edited March 25, 2021 by Andy Gates Double checked the decoder instructions Quote Link to comment Share on other sites More sharing options...
RICHARD WILLS Posted March 25, 2021 Share Posted March 25, 2021 S Bus ? I dont know about that, but I use to get the 165 and the 87 home from school . Took forever . I liked ringing the bell though . Sorry ... off topic ? Quote Link to comment Share on other sites More sharing options...
David P Williams Posted March 25, 2021 Share Posted March 25, 2021 Well I tried the Frsky rx Sbus output to a Frsky decoder in the wing on a model before reading about the potential problems, and it certainly killed the analogue mini servos I was using almost as soon as I switched it on to try it. YMMV of course. Quote Link to comment Share on other sites More sharing options...
Andy Gates Posted March 25, 2021 Share Posted March 25, 2021 I also used to get a school bus but it was so far out in the sticks it didn't even get issued a number. Ring the bell used to get us kicked off the bus.... Quote Link to comment Share on other sites More sharing options...
Andy Gates Posted March 25, 2021 Share Posted March 25, 2021 David, About to show my age here... Please translate YMMV? Quote Link to comment Share on other sites More sharing options...
Eric Robson Posted March 25, 2021 Share Posted March 25, 2021 Google translates Your mileage may vary. Quote Link to comment Share on other sites More sharing options...
Paul Johnson 4 Posted March 26, 2021 Share Posted March 26, 2021 Fares please....oh and at our age mileage is something we all have oodles of.... Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted March 26, 2021 Share Posted March 26, 2021 Ah the school bus. Ours had a hole in the floor so when it went through a puddle a fountain of water shot up through it, great fun to put the new first formers sitting in the seats next to it. IIRC YMMV could be your memory may vary, BIMBW. I must have been lucky with my FrSky SBus decoders as I’ve not fried a servo (yet). Quote Link to comment Share on other sites More sharing options...
David P Williams Posted March 26, 2021 Share Posted March 26, 2021 Sorry, I'm just another oldy trying to do the texty internetty shorthand acronym stuff. Just trying to be helpful based on my experience, but I probably used poor cheapo servos, so you'll probably be fine. I'll go back to lurking. Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted March 26, 2021 Share Posted March 26, 2021 The FrSky 4 channel S.Bus decoder follows the frame rate of the S.Bus signal and we have no control over that at all. It's always 9mS I think. I have had an analog servo burn out in flight when using one. As luck would have it, it was an aileron and it stuck near neutral. Servo was way too hot to touch after landing. That was after a good number of flights where I'd obviously thought everything was OK. There's a good discussion about different decoders and frame rates here (and earlier pages in that thread). There are a good few different ones that will drive analog servos safely. Quote Link to comment Share on other sites More sharing options...
RICHARD WILLS Posted March 26, 2021 Share Posted March 26, 2021 2 hours ago, Ron Gray said: Ah the school bus. Ours had a hole in the floor so when it went through a puddle a fountain of water shot up through it, great fun to put the new first formers sitting in the seats next to it. IIRC YMMV could be your memory may vary, BIMBW. I must have been lucky with my FrSky SBus decoders as I’ve not fried a servo (yet). Were the First Formers Laser Cut Ron ? F. U. N. E. X ? (Its just that ive got some bacon under the grill). 1 Quote Link to comment Share on other sites More sharing options...
Graham Davies 3 Posted March 26, 2021 Share Posted March 26, 2021 6 minutes ago, RICHARD WILLS said: Were the First Formers Laser Cut Ron ? F. U. N. E. X ? (Its just that ive got some bacon under the grill). 9. I. F. E. 10. M. 1 Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted March 26, 2021 Share Posted March 26, 2021 10 minutes ago, RICHARD WILLS said: Were the First Formers Laser Cut Ron ? F. U. N. E. X ? (Its just that ive got some bacon under the grill). No Richard, they were Di crushed, well Di was a fifth former and he liked bashing them. DBFF we used to call them. 1 Quote Link to comment Share on other sites More sharing options...
Andy Gates Posted March 26, 2021 Share Posted March 26, 2021 David, All opinions are welcome as we all learn from each other. Sorry if I seemed dismissive, that was not my intention. I was going by information from the current manual for the decoder as supplied by the manufacturer, which of course could be wrong in itself - hence the much testing to follow comment. Extract from the manual "The decoder’s output PWM frequency is automatically match with the input CPPM/SBUS signal frequency, make sure the proper servo is connected. Do NOT use conventional servo with SBUS High Speed mode and/or CPPM mode when frame length is shorter than 14ms.There is the danger of erroneous operation or damage." Thanks for the link Chris, yet more reading to do now and possible more confusion! But enough of this technical stuff, more of the Spitfires please folks! Quote Link to comment Share on other sites More sharing options...
David P Williams Posted March 26, 2021 Share Posted March 26, 2021 It's OK Andy - I was just feeling grumpy this morning. I should wait until I've had my breakfast before posting. I'm really enjoying following the builds here, I built one of Richard's Spitfires back in 2017/18 with an SC52fs, lovely. Quote Link to comment Share on other sites More sharing options...
RICHARD WILLS Posted March 26, 2021 Share Posted March 26, 2021 Yes , hang around David . Its much more fun when people chip in . If I ever sound like a clever Dicky , believe me , I trip over the mat (metaphorically ) more than anyone . Thats the best way to find out stuff . Nobody takes this stuff seriously , especially me . But we do have a passion which is contagious. I flew with Andy for quite a few years and he and his lad Robert are the kindest people you could meet . Quote Link to comment Share on other sites More sharing options...
Andy Gates Posted March 27, 2021 Share Posted March 27, 2021 I am wondering if I am getting slightly obsessed with tail weight now. Tailplane / fin fillets fitted in 1/16" balsa rather than block. Quote Link to comment Share on other sites More sharing options...
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