cymaz Posted January 9, 2018 Share Posted January 9, 2018 I have been given a home made delta ( from the same club member that gave me his 4 engined own design). I am toying with the idea of putting an undercarriage on it so I can fly it off tarmac. I don’t know how to do this, having never owned or built a delta. I am picking it up on Thursday so it will be a day or two before I can get some photos posted and general dimensions..I would love to see how other deltas owned here have had their wheels stuck on to give me some ideas/inspiration. I eagerly await your photos.....thanks! Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 9, 2018 Share Posted January 9, 2018 I have got one of these Cymaz, with steerable nosewheel, And main wheels just a mm or 2 behind the C of G Edited By Denis Watkins on 09/01/2018 18:08:28 Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 9, 2018 Author Share Posted January 9, 2018 Cheers Denis. Was the UC with the plane or retro fitted? Quote Link to comment Share on other sites More sharing options...
Dave Bran Posted January 9, 2018 Share Posted January 9, 2018 Does it have a rudder or rudders? Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 9, 2018 Author Share Posted January 9, 2018 Posted by Dave Bran on 09/01/2018 18:30:30: Does it have a rudder or rudders? IIRC , no. I might need to put a nose wheel servo in. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 9, 2018 Share Posted January 9, 2018 Those are the original mains, but I have now redesigned these to regular triangle, with extra supports inside the fus. I will get pictures when I can. Quote Link to comment Share on other sites More sharing options...
KiwiKid Posted January 10, 2018 Share Posted January 10, 2018 As Dennis has mentioned, the ideal location is just behind the CG. Depending on the size of your model this may work out to be10-20mm. In this pic of the Horizon DeltaRay (CG on the finger holes) you can see they have located them about 20mm behind the CG. This location stops the model sitting on it's tail and aids with takeoff rotation. It is also useful to set the undercarriage up so that the model sits with a slight nose up attitude, again to help with takeoff rotation. Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 12, 2018 Author Share Posted January 12, 2018 A few photos and some dimensions ( inches )to get us going... Span, 44 1/2 Fuselage length, 24 width 2 21/2 Tip width , 6 1/4 Rudder height, 9 Rudder width, 10 with 7 1/2” forward extension OS 40 fp Weight 3lbs 5oz Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 13, 2018 Author Share Posted January 13, 2018 Did some work on it today. Old 40fp removed as I found a 46ax in the back of the cupboard! Replaced the battery and switch as there was green corrosion on the wiring, ( more cupboard finds). Just ordered a FrSky Fasst Rx.. The CG was measured at 275mm from the LE by the fuselage. Also found some undercarriage legs from an old trainer. However, there is no room at the front for a nose wheel bracket, so I’ve bought a tail wheel bracket. Has anyone got any thoughts about fixing a tailwheel to a delta? I suppose it shouldn’t matter. The main gear will go just in front of the CG. Edited By cymaz on 13/01/2018 16:43:07 Also replaced the fuel lines and pipe work... Edited By cymaz on 13/01/2018 16:46:55 Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 13, 2018 Share Posted January 13, 2018 Try Cymaz, if you can, to keep the trike with the nosewheel on the front bulkhead It is nice, with a delta, to have the wing up in the airstream on the wheels for take off With the taildragger, you don't have the long moment arm to lift the model Quote Link to comment Share on other sites More sharing options...
fly boy3 Posted January 13, 2018 Share Posted January 13, 2018 Many many years ago before electrics came n the scene there was an ic traditional shaped delta whos name was followed by the the numbers 341. Golden oldies may remember the details (I cannot) .this had a tricycle u/c which worked very well. Sorry not a lot of help. Cheers Quote Link to comment Share on other sites More sharing options...
Flyer Posted January 13, 2018 Share Posted January 13, 2018 Posted by fly boy3 on 13/01/2018 18:22:22: Many many years ago before electrics came n the scene there was an ic traditional shaped delta whos name was followed by the the numbers 341. Golden oldies may remember the details (I cannot) .this had a tricycle u/c which worked very well. Sorry not a lot of help. Cheers Think you may mean this one flyboy3 https://www.sarikhobbies.com/product/rm29-363-delta/ Ade Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 13, 2018 Author Share Posted January 13, 2018 I will post photos soon to show the problem I have Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 13, 2018 Author Share Posted January 13, 2018 Hope the pictures show the problem..the tank sits right up to the rear of the engine. There is no firewall beneath the engine bay and tank bay to bolt the nose wheel bracket into.... Quote Link to comment Share on other sites More sharing options...
Flyer Posted January 13, 2018 Share Posted January 13, 2018 I'd be tempted to leave it as it is Cymaz and land it on any grass adjacent your tarmac. But, if you persist, could you fashion a front leg off the engine mounts? Is it a built up wing ? For the mains you could use the sort of set up used in Trainers? Bring the legs into the main 'box structure' and use clamps inside to retain them. Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 13, 2018 Author Share Posted January 13, 2018 I have a couple of old legs off a trainer. I will make up a mock when the tail wheel arrives. if it doesn't look good then I will abandon the idea...thanks for the feedback. Quote Link to comment Share on other sites More sharing options...
Flyer Posted January 13, 2018 Share Posted January 13, 2018 Posted by cymaz on 13/01/2018 21:47:26: I have a couple of old legs off a trainer. I will make up a mock when the tail wheel arrives. if it doesn't look good then I will abandon the idea...thanks for the feedback. I'd go with the front leg off the engine mount Cymaz, as if you fit a tail wheel, the delta may well catch the prop once the tail lifts; by using a longer leg than the radius of the prop, you will at least get yourself off the ground. With the sort of power you using, you could always hand launch and just use a taildragger configgeration for landing. Ade Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 14, 2018 Author Share Posted January 14, 2018 Posted by Flyer on 13/01/2018 21:55:40: Posted by cymaz on 13/01/2018 21:47:26: I have a couple of old legs off a trainer. I will make up a mock when the tail wheel arrives. if it doesn't look good then I will abandon the idea...thanks for the feedback. I'd go with the front leg off the engine mount Cymaz, as if you fit a tail wheel, the delta may well catch the prop once the tail lifts; by using a longer leg than the radius of the prop, you will at least get yourself off the ground. With the sort of power you using, you could always hand launch and just use a taildragger configgeration for landing. Ade I’ve taken your advice and cobbled something together this morning before flying. It should work and not get in the way of anything..a bit of lateral thinking and raiding the parts bin has come up with a workable solution....pics to follow when I get home . Thanks . Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted January 14, 2018 Share Posted January 14, 2018 How about adding a former to carry the noseleg between the tank and the rear of the engine? Or mount the noseleg off set to avoid the fuel lines. Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 14, 2018 Author Share Posted January 14, 2018 For all who have seen the thread, I have an update !!! Finished cobbling from this morning after freezing all my extremities out at Davidstow Club. I have just a fraction over 1" of prop clearance with an 11x6 APC... I found a pair of plastic bracket of something. One I butchered to make fit and drilled the hole out for the nose leg. The steering arm does not foul up the carb/pipework or firewall The push rod goes through the tank bay to the rudder servo The switch used to be in the front section but now the push rod goes right across the cut out. No big deal there is loads of room in the rear section. The switch will sit in there, behind the rudder servo. Do you think that will do the trick Before I forget...Have I got the main undercarriage in the right place Edited By cymaz on 14/01/2018 16:33:13 Edited By cymaz on 14/01/2018 16:36:45 Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 14, 2018 Share Posted January 14, 2018 Brilliant work Cymaz, and you have steering. You know the mains are behind the C of G, and the pic does look too far forward But that may just be the viewpoint Well done to keep this as a trike, as it has caused extra work Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 14, 2018 Author Share Posted January 14, 2018 Oh thanks...a bit of a brainstorm and a "Eureka" moment....quietly chuffed with the result Been on this CG calc and it calculates the CG at 305mm from the leading edge and not the 275mm (pencil line across the fuselage) I measured when I got the plane. Quote Link to comment Share on other sites More sharing options...
Flyer Posted January 14, 2018 Share Posted January 14, 2018 Looks good Cymaz , just shows what a little bit of lateral thinking can do. Looking forward to your flight report Ade Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 20, 2018 Author Share Posted January 20, 2018 A bit of progress today done after work Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 20, 2018 Share Posted January 20, 2018 You nailed it Cymaz, Looks very smart too Quote Link to comment Share on other sites More sharing options...
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