Dean Sarelius Posted August 7, 2019 Share Posted August 7, 2019 Also Just doing a dry fit with the motor mounted and the tail parts in place and the CofG is spot on which has got me really worried as I don't have a battery fitted as yet..? Guess I will be having to add some extra weight into the tail when I go to fit it out with the electrics or perhaps a smaller battery.? Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted August 7, 2019 Share Posted August 7, 2019 With the servos as far back as possible, just in front of the wing bolt plate, the battery on mine is more or less over the cg. This is with a 2200, but a 3000 will make it a tad nose heavy. Remember that the covering will move the cg rearwards. Quote Link to comment Share on other sites More sharing options...
Dean Sarelius Posted August 7, 2019 Share Posted August 7, 2019 Thanks Martin, I plan on doing the covering and final assembly next week so fingers crossed. I really hate adding weight so will also consider to cut out the bulkhead for the motor and move the motor closer to the wing but I guess that could be a little drastic. Quote Link to comment Share on other sites More sharing options...
Dean Sarelius Posted August 7, 2019 Share Posted August 7, 2019 Hi Martin Also did you make some small cut outs on the wing for the servo leads..? Quote Link to comment Share on other sites More sharing options...
kc Posted August 7, 2019 Share Posted August 7, 2019 You might only need 1 cutout for both servo leads. The leads can be inserted by first putting something like 'snake' inner through the middle hole with thin string attached and getting the string into the servo area, then pulling the string back with the servo lead ( or extension lead) attached. The covering material, undercarriage, tailskid, clevis etc might all affect the balance when installed so it's too early to tell, but provision for several positions for battery is a good idea. But if needed just a tiny bit of lead at the tail can adjust due to the leverage. Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted August 7, 2019 Author Share Posted August 7, 2019 Yes, otherwise how do you get the leads to the Y lead? This was wrtten before I realised I was on a previous page Edited By Peter Miller on 07/08/2019 11:54:40 Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted August 7, 2019 Author Share Posted August 7, 2019 I had to add some weight at the tail which was one reason I suggest solid tail surfaces. Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted August 7, 2019 Share Posted August 7, 2019 Dean, just build it as per plan and it will be fine. I would assume that you will use two aileron channels so a cut out either side of centre will be the obvious thing to do. Fit the drawstrings before covering the wing. Quote Link to comment Share on other sites More sharing options...
Dean Sarelius Posted September 23, 2019 Share Posted September 23, 2019 Hi Everyone, Thought I would share the pictures of the Ohmen. Just on the last leg of setting up, waiting for the battery (2200mAhr, 11.1V, 30C) and new push rods to arrive before completing the assembly and testing. Quote Link to comment Share on other sites More sharing options...
Chris North 3 Posted September 24, 2019 Share Posted September 24, 2019 Looking great Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted September 24, 2019 Author Share Posted September 24, 2019 That is very smart. I will look forward to your flight report Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted September 24, 2019 Share Posted September 24, 2019 Very smart looking job there. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted September 24, 2019 Share Posted September 24, 2019 Very tidy. Like the red nose and the trim lines. Quote Link to comment Share on other sites More sharing options...
Dean Sarelius Posted September 24, 2019 Share Posted September 24, 2019 Thank you everyone for your positive feedback. The only mistake I made was with the undercarriage so had to peel off the film and cutaway into the fuselage to fit some extra ply mounts. For most of my build it always seems to be the undercarriage that creates the most grief. I couldnt even find the right wire so ended up picking some up at the local scrap metal yard and when I went to purchase the rods he wasnt sure if they were aluminium or magnesium. I guess if they are magnesium and if it should go down in flames then it should be quite visible ha ha. Cheers Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted October 6, 2019 Share Posted October 6, 2019 Hi Dean. I have sent you a PM. Geoff... Quote Link to comment Share on other sites More sharing options...
chris larkins Posted October 8, 2019 Share Posted October 8, 2019 Dean, I have also sent you a PM. Quote Link to comment Share on other sites More sharing options...
chris larkins Posted October 8, 2019 Share Posted October 8, 2019 Has anyone done one of these as I.C ? I quite fancy one powered by an O.S FS-26 4 stroke. Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted October 8, 2019 Author Share Posted October 8, 2019 A 26 Four stroke would be perfect. Go for it!!! But keep it light Edited By Peter Miller on 08/10/2019 08:48:19 Quote Link to comment Share on other sites More sharing options...
Geoff Gardiner Posted October 8, 2019 Share Posted October 8, 2019 Hi Peter. I am thinking about building one of these in order to take my B test with, do you think it would be suitable? Many thanks Geoff... Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted October 8, 2019 Author Share Posted October 8, 2019 Hi geoff. The OHmen is very aerobatic but can be flown with precision so I would say, YES it would be fine. Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted October 8, 2019 Share Posted October 8, 2019 I would have liked an OS26FS in mine but both the ones I have were already spoken for. I would say that for a B test something like balsa Wot4 may be more suitable since you may have a problem with stall turns. The model also tends to bounce around a bit on a windy day. Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted October 8, 2019 Author Share Posted October 8, 2019 Never having taken a B test I don't know but Martin may wellbe right, it is small and light for windy days. Quote Link to comment Share on other sites More sharing options...
Trevor Crook Posted October 8, 2019 Share Posted October 8, 2019 Stall turns shouldn't be a problem, but yes, it's steadier in a light breeze. Having said that, I took my B years ago with a .20 powered lightweight aerobatic model. Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted October 8, 2019 Share Posted October 8, 2019 Trevor, I found that before I modified the rudder angle it pushed the tail up, especially noticeable if a lot of rudder was needed for a crosswind take off. Do not really wish to criticise the design because it looks and generally flies pretty good. A bit off piste but I originally gained a B about forty years ago in order to enter competitions. After an enforced lay off I joined another club and they accepted that I had a B, but I had lost the certificate. The BMFA, as the SMAE now is, could find no record of me whatsoever, so on a day when a couple of B tests were being run I volunteered to do it again. It was windy and to the surprise of the examiners elected to use a very light OS 20 powered funfly. Worse than taking your driving test again. Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted October 8, 2019 Author Share Posted October 8, 2019 Feel perfectly free to criticise the design. If something improves the handling everyone should benefit from the added knowledge. Alisdair Sutherland once oonted out that where the rudder is completley behind the elevatror Knife edge flight is much easier. I stil forget to incorporate that in my designs. Quote Link to comment Share on other sites More sharing options...
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