trebor Posted January 20, 2018 Share Posted January 20, 2018 Has anyone got the recommended c of g and control throws for this plane ? Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted January 20, 2018 Share Posted January 20, 2018 help any ?? Quote Link to comment Share on other sites More sharing options...
trebor Posted January 20, 2018 Author Share Posted January 20, 2018 Does that say balance point under the top wing ? Can't quite make it out. Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted January 20, 2018 Share Posted January 20, 2018 there you go,have one that I'm re-building ,found this 'out there' on the web,if it works let me know ! Quote Link to comment Share on other sites More sharing options...
trebor Posted January 20, 2018 Author Share Posted January 20, 2018 What's the chord length of that wing ? Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted January 21, 2018 Share Posted January 21, 2018 Buy scaling up the image to full size using a known dim ( forward strut ) CG is 4" from LE .What engine will you be using ?? Quote Link to comment Share on other sites More sharing options...
Anthony Scott 2 Posted January 21, 2018 Share Posted January 21, 2018 Mine goes "well" with an ASP 75, tho' the roll is slow. Quote Link to comment Share on other sites More sharing options...
trebor Posted January 21, 2018 Author Share Posted January 21, 2018 It came with a sticky laser 70 Quote Link to comment Share on other sites More sharing options...
trebor Posted January 23, 2018 Author Share Posted January 23, 2018 Posted by Anthony Scott 2 on 21/01/2018 13:08:12: Mine goes "well" with an ASP 75, tho' the roll is slow. What's your C of G, at the moment mine with a 9" chord on the top wing balanced out at 5.5" behind the leading edge taken from the centre as its swept back. At the moment it weighs in at 7lb, it feels like it will sink like a stone when throttle is off. Still to test it. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 23, 2018 Share Posted January 23, 2018 You are not wrong Trebor, they do sink well with no power on But at least the wings can be kept level in the steep decent And are brilliant to fly with the thick wings allowing slow fly with some power on I have both the 25 and the 40, and the slow roll is due to one set of ailerons on 2 wings A 60 2 stroke powers the 48" Edited By Denis Watkins on 23/01/2018 17:02:56 Quote Link to comment Share on other sites More sharing options...
trebor Posted January 23, 2018 Author Share Posted January 23, 2018 How's your CofG, I need to get as near as possible. I don't want to smash this one I quite like it. Do you have any differential on the movements ? Quote Link to comment Share on other sites More sharing options...
Nigel R Posted January 23, 2018 Share Posted January 23, 2018 trebor I have the small one. The CofG is dead on 50% chord of top wing. Hope that helps. I found an amount of aileron differential to be useful. I would guess around 75% movement on the downgoing. IIRC I have about 1/2" elevator either way, about 5/8" or so of UP aileron, and around 3/4" either way rudder. Obv yours will be more being 30% bigger. There is acres of wing area. 7lb will be fine on the big one. My small one is 4 1/4lb and can be flown quite slowly. Lastly, drag, you will soon discover there is an amount of it. Mine flies nicely with a 2/3 full power. As Denis understates, "a steep glide" is obtained with power off. Sometimes this is quite useful! Especially flying from a small club patch. I usually come in at about 1/3 power to keep it moving forwards and cut it only after clearing the threshold. Fairly standard biplane stuff I think. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 23, 2018 Share Posted January 23, 2018 Posted by trebor on 23/01/2018 17:09:17: How's your CofG, I need to get as near as possible. I don't want to smash this one I quite like it. Do you have any differential on the movements ? This model is very stable Trebor, you will not smash it Tank and motor are ideally placed, so good plug, run in motor, clean fuel and no thought of a smash 5.25" from the leading edge on the top wing centre C of G Differential is mechanical Large disc on servo, with both ball joints next to each other, on the outer disc holes There is barely any down on either aileron, yet normal up on each Similar to the Precedent Harvard/AT6 The rudder is very effective and assists scale turns And sideslipping a Bifly is a joy to watch Quote Link to comment Share on other sites More sharing options...
trebor Posted January 23, 2018 Author Share Posted January 23, 2018 Dennis, has the Model 40 got a 48" wing ? When you say normal up, can you give me any rough up and down measurements. Edited By trebor on 23/01/2018 18:54:28 Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 23, 2018 Share Posted January 23, 2018 Posted by trebor on 23/01/2018 18:53:57: Dennis, has the Model 40 got a 48" wing ? When you say normal up, can you give me any rough up and down measurements. Edited By trebor on 23/01/2018 18:54:28 Yes, 48" wing, was classed as a .40 model 25mm up 5mm down, but I fly sedate, zero expo on any model, I strive to prevent the pilot being airsick. I doubt that in flight that aileron gets anywhere near max, perhaps 20mm up Get All the elevator you can for landing, with no expo again, approx 21mm up And leave the rudder at max available deflection as rudder is always useful This is not a pattern ship, but a beautiful looking kit build that maybe built heavy or light The thick wings and small size make the airframe sluggish but a joy to fly Quote Link to comment Share on other sites More sharing options...
trebor Posted January 23, 2018 Author Share Posted January 23, 2018 Thankyou I have only been flying a couple of years and the first plane I had didn't have a steerable tail wheel so the rudder was always left maximum movement to aid ground steering and I got used to it. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 23, 2018 Share Posted January 23, 2018 Bit unkind to call it sluggish maybe Denis, mine was a joy to fly....cue the sarky comments on my looks. Quote Link to comment Share on other sites More sharing options...
trebor Posted January 24, 2018 Author Share Posted January 24, 2018 Have you still got the hair or has it shall I say disappeared Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 24, 2018 Share Posted January 24, 2018 Posted by john stones 1 on 23/01/2018 23:46:27: Bit unkind to call it sluggish maybe Denis, mine was a joy to fly....cue the sarky comments on my looks. I was trying to be diplomatic John, for the young lads comment that this was slow in the roll But as you say, they are a joy to fly, and solid, with knock off wings in the event of an ungainly arrival These are great to build too Quote Link to comment Share on other sites More sharing options...
Nigel R Posted January 24, 2018 Share Posted January 24, 2018 Are they foam wings on this size? Fuse structure looks like Precedent's standard liteply type. Surprised you need that much differential Denis. Is your smaller one set up in a similar way? Quote Link to comment Share on other sites More sharing options...
trebor Posted January 24, 2018 Author Share Posted January 24, 2018 My 48" wings are foam cored and the fuselage is very thin ply, a bit too thin if you ask me could do with doubling thickness on the edges. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 24, 2018 Share Posted January 24, 2018 Posted by Nigel R on 24/01/2018 09:37:37: Are they foam wings on this size? Fuse structure looks like Precedent's standard liteply type. Surprised you need that much differential Denis. Is your smaller one set up in a similar way? These were the 1st Precedents that I picked up at a show quite some years ago And your right Nigel, the 25 just has equal aileron up and down. I did not plan on the differential, I discovered the movement on building the AT6, and then set up the Bifly similarly. You will remember the limitations on 4 channel early 35mhz, alternate ways to mix were found mechanically. I set up the one sided disc servo arrangement and flew with it since, ie, more up than down Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 24, 2018 Share Posted January 24, 2018 Posted by trebor on 24/01/2018 06:38:22: Have you still got the hair or has it shall I say disappeared I have a much wider parting Trebor. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted January 24, 2018 Share Posted January 24, 2018 Must admit mine was arrived at somewhat haphazardly, from the sound of it in a similar manner. Single servo with torque rods - the torque rods have a slightly offset horn, and with a 90deg bend in the rod, it puts the horn in just the right place to give more up than down - fortuitous. Of course on a high wing the effect is all the wrong way around - unfortunately. Quote Link to comment Share on other sites More sharing options...
trebor Posted January 24, 2018 Author Share Posted January 24, 2018 Posted by john stones 1 on 24/01/2018 14:48:46: Posted by trebor on 24/01/2018 06:38:22: Have you still got the hair or has it shall I say disappeared I have a much wider parting Trebor. I know what you mean, at least I can grow more on my chin now. Quote Link to comment Share on other sites More sharing options...
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