Geoff Parkes Posted February 12, 2019 Share Posted February 12, 2019 Is anyone else building one of these planes , it was a free plan a couple of RCME issues ago its a 60,s style aerobatic plane with trike undercart, the plan leaves several areas up to the builder to sort out, I have built it for electric power no problems there, its got a 5055 motor, 70 amp speedo,15x8 prop. I have not watt tested it yet but on 6 s it seems to have loads of power, during the build I kept checking the C/G balance, keeping the tail light, the usual things that you check when building lecy. planes.The problems started when I tried to balance the plane on its wheels for the first time, I had previously balanced the plane with a slightly nose heavy C/G but tying to get the plane to balance on its wheels was impossible the tail kept dropping to the bench (its a trike undercart) the legs are raked forward, there is no details of leg length or rake angle on the plan , the legs can only be located in one position the bearers are shown on the plan and the wing ribs are shaped accordingly, I have packed 65mm under the main wheels this gives a positive feel to the balance of the plane on the bench, but I have now so much negative angle of attack that there is no gap under the prop. I am at the moment converting it to a taildragger, but before I cut the hinges on the rudder to fit a steerable tailwheel does any one have any thoughts or suggestions as trike undercarts were a feature of 60, s aerobatic planes and it seems a pitty if I remove this feature if there is an answer out there that i am overlooking Quote Link to comment Share on other sites More sharing options...
Masher Posted February 12, 2019 Share Posted February 12, 2019 Hi Geoff If you search, there are a couple of threads started on Moonglow. In this one Eddie provides some advice which may help. I am building one but am not as advanced as you are so can't help. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted February 12, 2019 Share Posted February 12, 2019 Geoff On the Outerzone plan, the main legs are vertical, with the axles just behind the C of G And the model at my field, sits and drives on the mains comfortably Am not keen on this raked forward idea as this is problematic on any model Quote Link to comment Share on other sites More sharing options...
Geoff Parkes Posted February 12, 2019 Author Share Posted February 12, 2019 Thanks to everyone for the help, as I spent 2 hours getting the screws out of the firewall that hold the nose wheel on yesterday afternoon, I think i will go as my first idea of converting to a tail drager, might take out the forward angle of the main legs, lets hope it does not induce a nose over attitude on take off, will advise , i think 6s on my set up will be to much, but a Watt meter will confirm, will advise once I can stop the prop. hitting the ground ! Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted February 12, 2019 Share Posted February 12, 2019 For a taildragger Geoff Looking directly down on the wing in Plan View You should see some of the main u/c tyre in front of the leading edge The absolute best position for the u/c is that the wheel axle is on the leading edge Quote Link to comment Share on other sites More sharing options...
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