john stones 1 - Moderator Posted March 18, 2014 Share Posted March 18, 2014 Got inspired to own one same as I did on Pushy cat thread but bad weather meant work slow so couldn't afford plan so I drew my own. 34 inch w/span chord 10 inchish, fuzz 33 inch. not decided on motor yet but I want it mental Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted March 18, 2014 Author Share Posted March 18, 2014 I didn't think it was that bad folks anyway im doing it electric, hence no canopy yet shall be one piece to get at lipo been looking at a Turnigy D3536/6 motor 500w 1250kv Quote Link to comment Share on other sites More sharing options...
Levanter Posted April 6, 2014 Share Posted April 6, 2014 John. Everyone now seems to go for an elevator joiner unless they want independent movement of the elevator halves, Did you use snakes in your model and what are you going to cover it with? Thanks for your comments on my MJ. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted April 6, 2014 Author Share Posted April 6, 2014 I used spruce for the joiner, I cant get on with wire, I always end up with elevators out of line. I have fitted snakes in mate but with wire inners, rather than the plastic ones I put a Z bend at servo end and a clevice on the outer for adjustment, have to solder an adaptor onto wire though to fit a metal clevice. Will cover it with H.K. covering, only used it once found it very easy to use and much cheaper than Profilm. Will put some pic's on later, I am still building it, got sidetracked by work Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted April 6, 2014 Share Posted April 6, 2014 I like it John. I don't suppose you could get me a copy of your plan do you? It looks like exactly the sort of thing I'd like to build next. Oh and what are you going to cover it with? Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted April 6, 2014 Share Posted April 6, 2014 Looks good to me John. Can't see you going far wrong with that one. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted April 7, 2014 Author Share Posted April 7, 2014 Thanks Colin I got the building bug for smaller models back from you folks Done the Pushy Cat, love it Dawn Flyer next, waiting to see if I can get mag and plan off one of the lads Doing that electric also Gary When you bring that £20 you owe me, I will lend you the plan. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted April 7, 2014 Author Share Posted April 7, 2014 So far it weighs in at 24 oz, including motor, esc and lipo, only the fuzz and tail end to cover Then add the weight of wire u/c and wheels plus 4 x 9g servo's Wing on its own weigh's 7oz, motor I am thinking of is turnigy D3536/6 1250 kv (500watt), 40 amp esc, 9x6 prop I think, going for 3s lipo not sure what mah I need so advice appreciated. HK covering again, good stuff, £12 for 5 metre. A picture of snake and wire I use on small stuff, always metal clevices never use plastic myself. Quote Link to comment Share on other sites More sharing options...
Masher Posted April 7, 2014 Share Posted April 7, 2014 Looking good John! You don't think 250W per pound is going to be a bit strong do you? It goes like stink with a 15 IC in it You need to decide what power you want then how long a flight to indicate battery size. Assume you get about 80% efficiency. So for example. 2ib weight lets say 150W/lb gives 300W 80% efficiency takes this to 360W draw on battery at WOT assume 3S = 12 volts so current (max) = 360/12 = 30A max (so your ESC is Ok) a 2200mAHr LiPo would last 2.2/30hr = 4.4 minutes flat out, or about 8mins on average of 15A draw I've probably got this wrong cause it's past my bedtime but this is sort of sum you need to do Edited By Masher on 07/04/2014 22:42:45 Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted April 7, 2014 Author Share Posted April 7, 2014 I am not that up to speed on electric Masher its new ground for me, but I do want it mental I want to do some hovering, torque rolls etc not after speed just lots of pull. I will listen to advice if I've got it wrong though, its only my second electric Quote Link to comment Share on other sites More sharing options...
Masher Posted April 7, 2014 Share Posted April 7, 2014 See my edit. Just means you could get away with much smaller motor which is obviously lighter Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted April 7, 2014 Author Share Posted April 7, 2014 What do's ....WOT mean? And to make life easier for both of us recommend me a Turnigy motor size for it because you lost me after ....ESC bit Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted April 7, 2014 Share Posted April 7, 2014 Odd shaped servo holes in the wings. Presumably thats because of the wing thickness and you need something thin. What servos are you using? Edited By Gary Manuel on 07/04/2014 23:15:18 Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted April 7, 2014 Author Share Posted April 7, 2014 Side mounted on a ply plate Gary plate will screw to spruce rails I fitted in wing 9g mg digi's same as pushy cat. Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted April 8, 2014 Share Posted April 8, 2014 Ah - that makes sense. Thought maybe you were going for a lighter weight version this sort of thing: **LINK** What brand / model do you use? Edited By Gary Manuel on 08/04/2014 06:12:55 Edited By Gary Manuel on 08/04/2014 06:13:48 Quote Link to comment Share on other sites More sharing options...
Masher Posted April 8, 2014 Share Posted April 8, 2014 Hi John Sorry about that - I'm not really into electric models either so I should have been clearer. WOT is Wide Open Throttle or full chat in normal speak! Look at a motor which is equivalent to a 15 size - some people use this - I know HK do for some of their motors Otherwise you are looking for a 300W motor - this is usually shown on Giant S site I think 300W for this model will give you the mental performance you are looking for. Another simple way to work out a power train is to "copy" an existing model. I know that the Acrowot foam-e is similar and does 8mins off a 2200 3S battery. Look up spare motor for that (or WOT 4 Foam-e) and see what spec that is - IIRC it's about 300W Quote Link to comment Share on other sites More sharing options...
Masher Posted April 8, 2014 Share Posted April 8, 2014 Here is one which is specified to directly replace a 15 glow And guess what it gives 500W max which is what you had already chosen!!!!!!!!! Some times I should just keep my trap shut, you were doing fine as you were, sorry! Edited By Masher on 08/04/2014 07:27:36 Quote Link to comment Share on other sites More sharing options...
Masher Posted April 8, 2014 Share Posted April 8, 2014 Now I'm a bit confused! A 40 size glow is about 1 horse power which is about 746W So a 15 produces about 15/40 x 746 which is about 280W This will be about 140W per ib which is supposed to be plenty So where does the 500W come from even if we allowed only 80% efficiency this would be 400W Sorry John, but I hope somebody better informed comes along soon Edited By Masher on 08/04/2014 08:03:27 Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted April 8, 2014 Author Share Posted April 8, 2014 Its confusing mate Then you factor prop in and I get lost, it seems like you have to think backwards at times you just taught me what WOT meant though so I've learnt something else Gary those servo's look interesting cant remember what make I used on Pushy Cat, was recommended them by a club mate will have to ask him coz cant see name now they are fitted. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted May 8, 2014 Author Share Posted May 8, 2014 I bet you've all been thinking "what's happened to johns not a mini jazz"...NO Well i'll tell you anyway, backorder that's what. I don't like changing once I trust things, but got fed up waiting. So on recommendation bought Turnigy G15 motor and Pentium esc, metal geared digi servo's and 2200 3s lipo's, we shall see. All the buildings done just needs finishing at cowl and battery box shelf on. Canopy I made looks rubbish so i'll spray the plastic one and glue to it. John Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted May 21, 2014 Author Share Posted May 21, 2014 All done got electrics to fit then its ready, and u/c. Going to add a bit of colour. Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted May 22, 2014 Share Posted May 22, 2014 That looks great John. Very tempting. Quote Link to comment Share on other sites More sharing options...
Masher Posted May 22, 2014 Share Posted May 22, 2014 Nice one John, still time to put an IC in it though! It would be good to see it next to a MJ and see how close you are. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted May 22, 2014 Author Share Posted May 22, 2014 Cheers lads Its got to be electric Masher it's starting to sink in, so I can't quit now If it flys like everyones Mj I'll be happy, I think it'll be o.k. John Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted September 7, 2014 Author Share Posted September 7, 2014 Flown today no dramas quite sprightly on the G15, balanced without lead I think I could move c.g back a bit I went for 33% of chord. Stall is non event elevator is powerful but feels right, rudder is very powerful and ailerons are crisp. Needs a touch of right thrust taking off. I think I get about 7 minutes flight but I keep forgetting to start timer, shall have to make it throttle activated. I have a 10x6 prop on, draws 34 amp, I am going to try an 11x4 ish max amps is 45 and I will check with the watt meter to make sure it's o.k. not bad for a model that cost about a tenner to make John Edited By john stones 1 on 07/09/2014 22:06:00 Quote Link to comment Share on other sites More sharing options...
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