Kester Paine
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Hi Paulo, Re the servos, I seem to remember that I used a servo tester to centre the servo, then fitted the arm and then (using the servo tester) set the arm off to the end of the travel, which took the arm just inside the wing. I think I made the slot in the bottom sheeting slightly longer than on the plan, in order to achieve this (but I might be dreaming this !). In terms of throws, I'm using: Aileron: Low 4mm, High 8mm Rudder: Low 6mm. High 10mm Elevator: Low 4mm. High 6mm I did have a look on Youtube at one video of your club (20th September). That BAe Hawk flown by Nuno Miguel is simply stunning ! Very trick with the moving pilots etc, but it was the flying that was utterly convincing. Cheers Kester
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Hi Paulo Glad to see someone else building Sprite. I completed mine about a year ago, but it had a fairly eventful first few flights. It was my original intention to use a micro Tx (from a Parkzone ultra micro spitfire) and put this in the box with the plane, so that I didn't have to cart my proper Tx around. But a combination of the throws being too high (and not being able to set them small enough mechanically), plus the lack of expo made the plane totally uncontrollable. Once using a programmable Tx, and getting the CG right, it's a nice little flyer. Mine comes in a 180g (using a 2S 450mAh lipo). I use a 5x5 prop which delivers 55W, so that's 140W/lb which is punchy enough. Flight times are about 6-7minutes. The required throws are less than you might think. If you want info on the throws I use, or anything else about this model, just shout. Cheers Kester
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Flightline Spitfire 1200mm with sound module
Kester Paine replied to Kester Paine's topic in Warbird kits
Posted by David Ashby - Moderator on 21/09/2018 09:36:17: Here we are... just iPhone footage I'm afraid. It did sound good though. I'll ask him to drop by if he can but Brain Collins' article on sound systems from the May 2018 issue might be a good starting point. Edited By David Ashby - RCME on 21/09/2018 09:36:52 Thanks David. The article you mention was very good. Indeed it started my thinking on this and made me realise that I'd need to look at the more expensive end of the sound module range if I want it to be heard ! Looking forward to seeing your clubmate on this thread -
Flightline Spitfire 1200mm with sound module
Kester Paine replied to Kester Paine's topic in Warbird kits
Thanks BEB, that was useful. I had realised that MrRCSound uses transducers and that these need to resonate a surface, but hadn't twigged that it's best to fit them to a hollow box. Of that makes life a lot easier in terms of fitting I was a bit concerned that adding the mrrcsound to a smallish plane might make it too heavy and a pig to fly, but I think with a 2800mAh 4S, and sound module, it'll probably be around 1870g all-up, which is the equivalent of fitting a 3300mAh lipo. The model spec says it should be able to cope with a 4000mAh lipo, so I think I'll be fine. Still keen to know if the 1.2m flightline Spit is roomy enough inside to install the sound module without having to hack out a bundle of foam ! -
Flightline Spitfire 1200mm with sound module
Kester Paine replied to Kester Paine's topic in Warbird kits
Thanks. When you fitted the MrRCSound to the P51, where did you mount the transducers, fuse or wings ? And did you use one or two ? I not sure if to mount 2 xTT-25 in the radiator scoops of the Spit, but I think I might need to point them 'up', so that the wing transmits the sound, but then I'm not sure if most of the sound will be directed upwards. -
I saw a video on YouTube from David Ashby showing a clubmates Flightline Spitfire, fitted with MrRCSound. Does anyone have experience of fitting this sound system to the 1.2m version of Flightline Spitfire ? I'm thinking of doing just that and would love to hear of your experience, please.
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oops - forgot the photo...
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Hi Tim, My boxing clever/Sprite is coming along slowly. I've almost finished building the wings. I plan to use an old Parkzone DSM2 transmitter (the type that comes with small RTF models), but this has no servo-reverse or travel adjustment, so everything has to be done mechanically. My thinking is that the plane and Tx can then live in a box, so that only a lipo is needed for a quick sortie ! Then I could leave the model at work You'll see from the photo that the servo has moved outboard - this is so that it moves in the right direction with the Tx that I'm using. I'm now scratching my head though, as I can't find any info on control surface throws in the plans or build article. If you have any info on this, could you let me know, please ? I'll use this info to determine the length of the horns, so that full movement on the Tx gives me the correct throw on the model. Cheers Kester
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Hi folks, Thanks for your help on the covering/hinging techniques. I've now tried a similar method on a simple micro-powered glider (see Bitty posts) and it seems to be holding up well, and is very neat. I'll try this on an aileron model next. Kester
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'Bitty' multi purpose micro glider
Kester Paine replied to Richard Harris's topic in Own Design Project Blogs
Hi folks, Last year I built my powered rendition of Bitty, named Bitt-E (see previous posts). Thought you might like to know how it has gone since then... In short, I consigned Bitt-E to the role of 'first prototype' (and the bin..), as it had some really nasty traits: - Climbed much too strongly under power. - Rock very badly under power (to the point where it once turned over and crashed) - Too heavy, and hence glide path not very good. So, now we have Bitt-E II... The following changes were made: - The wind was uncovered, and the dihedral angle on the tips halved. Wing recovered with solite (rather than standard solarfilm) - Entirely new fuselage, with lighter servos, receiver, lipo (now 2S 450mAh), lighter tail and fin, lightened back end of fuselage, lengthen nose and 3degrees of downthrust. Also covered in solite. The new model weighs 159g, compared to V1 which weighed 212g (needed 15g of additional weight in the nose, as tail was too heavy). Wing loading is now down to around 7oz/sq.ft. I'm pleased to say that this one flies really well, alleviating all the issues that I saw with V1 (phew !). Flight time is about 16minutes, with about 7minutes under power, the rest glide. I hope this might improve if I manage to catch a thermal ! I now leave this model at work in a custom-made case, so that lunchtime sorties can be made
