Geoff Gardiner Posted August 19, 2020 Author Share Posted August 19, 2020 Little bit done today: Trimmed the side air intakes Drilled the wing for the dowel and wing bolts then installed the captive nuts in the wing plate. More later... Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted August 19, 2020 Share Posted August 19, 2020 Now got the fan blade fitted. It was described as a different make but is in fact the same. Problem was that when tightened up it jammed, but grinding 2mm from the rear to match the original sorted it. A lot of work to replace the damaged wiring and get everything installed again but I am more or less happy with it bar getting the main batteries in a position to get the cg correct. Gave it a run up over wooden decking with luggage scales connected but despite having cut a very large cheat hole am apparently only getting 2.25kg of thrust. Tried digi kitchen scales on the nose and the reading was similar. I then tried it on longish very soggy grass and it at least started to accelerate. Tried putting my thumb nail in the exhaust edge and the revs seemed to increase a lot with a better jet like sound just as I did with my Gnat. No readings taken though. Where do you propose to put your Rx and the servo batteries? As you can see from my pics I have masses of wiring and clutter which I have kept as much as possible out of the airflow. It will be quite a while now until the weather calms down and the patch dries out enough for taxiing trials. Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted August 20, 2020 Author Share Posted August 20, 2020 Hi Martin Out of interest, what happened to your original fan blade causing it to shatter? The plan with mine (at the moment) is to fit the receiver and servo batteries up against F2 with access via the cheat hole. I have been waiting ages for H-King to get their Life Zippy receiver batteries back in stock and can't decide between 2 x 700mah or 2 x 1100mah. The first option being lighter but possibly a bit low in capacity - What are your thoughts Martin? Regarding your thrust measurements, what batteries and 'C' rating are you using? If they are Multistar's (which I seem to remember you mentioning in another thread), might the 'C' rating be a bit low? Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted August 20, 2020 Share Posted August 20, 2020 Hi Geoff, I already admitted earlier to running the fan with the wing off and sucked in a 10w connector! I have fitted 700 LiFe packs but they may not be big enough to drive 10 servos plus retracts. Could maybe steal some 1100s from other models. Main batteries are 2x 5c Zippy compact 5800, 25c Just been re looking at the cg and have had to push the packs way forward so will need to extend the mounting plate and the wiring a little. Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted August 24, 2020 Share Posted August 24, 2020 At a bit of a loose end I have now made some changes. I originally had twin rudder servos either side of the fan in order to reduce any impediment to the airflow but have instead fitted a HS80MG in the centre. Also swapped over the ESC, switch/ RX mounting plates to get the cg a little further forward. I now have one battery in the normal position and the other on the opposite side up to the front former. This puts the cg in the correct place and allows a bit more airflow. I have had to extend the ESC to fan wires plus some short 10 AWG ones to connect the packs in series. It is ready to go apart from the 700 Rx packs. Weight is now 11.4 lbs. Ouch. Quote Link to comment Share on other sites More sharing options...
Peter Hammond 1 Posted August 24, 2020 Share Posted August 24, 2020 Hi all, Interesting thread, I am also thinking of building one of these Hawks, although I'd buy the full kit and wood pack. I'd like to go 6s with approx 3.7 Kg stated fan thrust at take off voltage, and I think a model weighing in at about 4.5Kg to 4.7Kg. It will be really interesting to hear how yours fly. Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted August 24, 2020 Author Share Posted August 24, 2020 Hi Peter, Are you going to do a build blog? I would like to see a 6s version built. I have built a few of Tony's models but can never seem to achieve the target weight - always comes out a pound or three heavy! Martin, any chance of a picture of your alterations? - and good luck with the maiden. Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted August 25, 2020 Share Posted August 25, 2020 Still a bit messy despite removing the lights controller but at least the wiring is as short as possible and the cg correct. Quote Link to comment Share on other sites More sharing options...
Peter Hammond 1 Posted August 25, 2020 Share Posted August 25, 2020 Geoff, Yes I will do a build log for sure. I haven't built a plane since I was a child, that was a Precedent Hi-Fly 2. Recently I've been concentrating on helicopters, but I do have a Wot 4e that I fly about with. So this will be a challenging build for me. Martin, Nice photos, I look forward to hearing how your maiden goes. Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted August 31, 2020 Author Share Posted August 31, 2020 Thanks for the pics Martin. Little bit more done on mine: I made up some base plates for the air intakes and glued them on using canopy glue. Then made a paper template for the cutout, attacked it with the drill and sanded smooth. I have also 3d printed an exhaust ring and glued that on with canopy glue. More later... Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted August 31, 2020 Author Share Posted August 31, 2020 Looking at the pictures I might open up the air intake holes a bit more. Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted August 31, 2020 Share Posted August 31, 2020 I think that I shall take the Dremel drum sander to mine again before I venture out with it. Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted September 1, 2020 Author Share Posted September 1, 2020 Re-inforced the wing join with some 225g/m2 glass fibre tape and epoxy resin (secured the ends with CA first). Will do the underside next with a slightly narrower strip. More later... Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted September 15, 2020 Author Share Posted September 15, 2020 Some more bits done - Tailplane and Fin: More later... Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted September 24, 2020 Author Share Posted September 24, 2020 I've made a start on the covering. I probably should have gone down the 'iron on' route, because I know that weight is going to be an issue, but for a scale model I much prefer a paint finish. I think I am going to try and fly this one before painting and attaching the side air intakes / cockpit detail. More later... Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted October 1, 2020 Author Share Posted October 1, 2020 Fuselage getting covered: More later... Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted October 11, 2020 Author Share Posted October 11, 2020 Last bit of glassing done this evening. Most of the airframe was covered using epoxy. However, I have used Eze-Cote on the tail parts mainly because it is easier than trying to mix up small amounts of epoxy resin (and much quicker). More later... Quote Link to comment Share on other sites More sharing options...
Peter Hammond 1 Posted October 12, 2020 Share Posted October 12, 2020 Looking really good Geoff. Can't wait to hear about the maiden. Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted October 21, 2020 Author Share Posted October 21, 2020 In an effort to try and keep weight down as much as possible I thought I would have a go at using Feddy B's secret sauce. I have been weighing each part at different stages of the build and will post the results at the end if anybody is interested. More later... Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted October 27, 2020 Author Share Posted October 27, 2020 A few more bits done: I have given the wing a coat of sauce and sanded back, also added the anti stall fins (which I nearly forgot). Installed the anti roll fins to the bottom of the fuselarge. I made a jig to help get the angle correct. I have also designed and 3d printed a pair of air intakes that will be fitted to the top hatch. More later... Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted October 27, 2020 Author Share Posted October 27, 2020 Painted some sauce onto the fuselage: I am going to need a bit of filler where the nose cone attaches to the fuselage. More later... Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted October 28, 2020 Share Posted October 28, 2020 What is the recipe for the sauce please? I have forgotten and cannot find it anywhere. Quote Link to comment Share on other sites More sharing options...
McG 6969 Posted October 28, 2020 Share Posted October 28, 2020 Hi Martin, I've been using Freddy B's Sauce on my Bella Ballerina some years ago now. If you visit page 43 of my build blog, there it is... @ Geoff > yes please, if you have your notes at hand, I would be very interested in your parts weight progression... Cheers & keep careful, gents Chris Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted October 28, 2020 Share Posted October 28, 2020 Thanks Chris, that is not where I saw it but shall look up the Ballerina. Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted October 28, 2020 Author Share Posted October 28, 2020 Hi Martin. I am using roughly equal amounts of light weight filler, talc (baby powder) and water based varnish. Then add a dab of paint for colour and thin with a bit of water to a thick paint consistency. Quote Link to comment Share on other sites More sharing options...
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