Glenn Howcroft
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Just to say thanks for a really great design Peter. I'm actually going to build this one .. my first plane in nearly 2 years !!!. I caught the helicopter bug and have been learning to fly, and fix the bent ones, for a what seems like ages now. Can't wait for the smell of superglue, the balsa dust and the cut fingers ... again. It's going electric though .. can't do with all those smelly, noisey things any more. Will be using a Emax 2820/07 motor, swings a 11-12 inch prop on 3 or 4 cell LiPo. More or less a direct replacement for a .32 i.c. engine so should work fine. Have used the same setup in my OD Tucano of 56 inch span and flew well on 3s, but will probably go to 4s for the extra grunt. Will post some pics when I finish it.
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Hi Peter I know what you mean with a well setup I.C, my shuttle heli has never missed a beat in 5 years. Then again, the "it goes or doesn't go" applies to electric as well, once setup, and with no mess . Did some tests tonight and it appears the battery I used is a little tired so a new battery needed .. Also put the new outrunner in the model and reprogrammed the ESC. No more throttle trouble now, must have been some idiot who did it wrong the first time .. (me )
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Hi peter(s) The flight over grass certainly proved the plane, so im happy there. Im still not convinced that the poor power with floats on is down to needing a bigger motor. Although I do have a nice outrunner I can fit if all else fails. Im using a brand of ESC i've never tried before,( from the cheap end of the market ), and I think the problem could be there. Static tests on the bench last night showed that the motor was at max revs at a little over half throttle. I'll have to check the prop RPM with this ESC and compare it to the same setup with another ESC. I seem to remember that this motor reved a lot harder on my old Castle Creations ESC, ( now defunct, my son with his buggy, don't ask ). I'll try a couple of different batterys as well just to make sure there ok. Ahh well .. it's all part of the fun.
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Hi Peter Finally got that Husky finished. Tried it out today at my local boat clubs lake. Taxi trials went very well, lots of control on the water with the twin water rudders, tracked nice and straight and got up onto the step with little fuss, lots of power. Unfortunately the flight wasn't so good.. took off with no problems but just didn't seem to want to climb away .. as though once past 3/4 throttle I was getting no more power. Things just seemed to get worse power wise so had to bring her around and land very quickly. As can be seen from the next pic it was quite a heavy landing .. floats tried to do the splits. I checked the connections and the ESC seems to work fine when I run her up static. The motor pulls 37amps static with a 60a OPTO ESC, ESC doesn't even get hot. I removed the floats and had a 10 min flight after .. over grass of course . Flew really well too. Glenn
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Np on the ply comment Peter . it's the first time i've tried building the sides like that .. bit of an experiment .. but im happy with the results so far .. I must admit that I build more than I fly .. Once I've flown the model 3 or 4 times its time for another build. I do boats as well, (hides face in shame ), Thats part of the reason the Husky is on floats .. As Phil says boats are fun .. but as I prefer electrics have a look at http://www.ampdraggers.co.uk/ I do believe there faster than IC as well .. they just dont race as long. I've clocked the mono 1 fast electrics at over 40 miles an hr with the club speed gun .. mono 2,3 and the hydros are faster !!!
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I know .. i know .. liteply would have been better. I just happened to have the 1/16th ply already and im tight with my money !!! . Saying that the model as shown with wire U/C and fiberglass skins on the bottom of the floats only weighs in at 1lb 3 oz .. Peter, your right about the full size planes .. I was at RAF Cosford museum last week, had a fantastic day. It really gives you a buzz for making models when you get up close to the aircraft you've only seen in books. Standing under a Vulcan bomber looking up into the open bomb bay is something i'll not forget !! .. or walking around the TSR2 .. magic I came away with loads of photo's and another 2 or 3 models on the "must do" list .
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Thanks for the replies Peter (s) .. The sides are actually from 1/16th ply ... heavier I know but with all those wholes it's not too bad .. and strong. Theres also a pair of 1/4 sq balsa longerons top and bottom of each side running full length. .. You can see from the attached working plan .. The floats are from a free plan on i found at www.svensons.com/airplanes .. the wing section is also from another plan .. but the rest is mine. I've made some changes from the plan shown .. just not had time to redo it .. I'll try the plastic sheet for the screen ...
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Floats from free plans on www.svensons.com/airplanes/ ..
Glenn Howcroft posted a gallery image in Member Albums
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Hi all .. Great reading Peter. Thought i'd post a pic of my latest OD model a Christen Husky, should be around 58 inch span and 8 inch chord if I ever get it finished. For electric power. Drew up my plan in TurboCad from a 3 view I found online. Will be stand off scale .. Still deciding how to do the canopy for this one ... Edited By Glenn Howcroft on 02/06/2009 23:18:27
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