Ramblin gruntfuttock Posted March 7, 2019 Share Posted March 7, 2019 So my build has started. Will be a slow job but already learning loads from the other builds. Chris, you reckon it will be the naughty step if you don't do this in 6 months. If i manage it n 6 months I will be parading like Usain Bolt at the Olympics. First of many questions. John has put the fittings in for the motor, which I need to buy. From what Chris has stated earlier am I right that I need something around 500KV. Bare in mind I am a total novice learning on a foam trainer. I don't need light speed.....yet. Cheers Jim Quote Link to comment Share on other sites More sharing options...
Ramblin gruntfuttock Posted March 7, 2019 Author Share Posted March 7, 2019 Sorry meant Tony not John. 🙄 Quote Link to comment Share on other sites More sharing options...
tony oneill 1 Posted March 9, 2019 Share Posted March 9, 2019 Hi jim, i decided to go with a ripmax quantum 40 motor and 60A speed controller with a 4 cell battery at 14.4 volts. This is the equivalent of a .40 or 6cc two stroke engine. This should give the plane trainer like flight (i hope) as i am moving on from high wing trainers. I have two other .40 two stroke planes, both low wing thats why i went electric. Motor mounts can be make from plywood, or you can buy ready made aluminium ones. There is a mounting plate on the rear of the motor that fits to the mount. I went with threaded rod as its cheap, will be covered and will be easy to angle the motor if i need to. First time I've tried it though, so if its no good its easy to change. That said its stronger that i thought and with the motor fitted there is no movement so I'm confident it will be ok. I used M4 rod with nylock self locking nuts and plain washers. All from B and Q total cost around 7 quid. The motor and speed controller were about 70 quid together. Regards Tony Quote Link to comment Share on other sites More sharing options...
tony oneill 1 Posted March 9, 2019 Share Posted March 9, 2019 Oops, i should mention the firewall F1 former could be moved forward and trimmed at the bottom to provide a direct mount. I decided not to in case i decide to put a two stroke in as a conversion Quote Link to comment Share on other sites More sharing options...
Ramblin gruntfuttock Posted March 9, 2019 Author Share Posted March 9, 2019 Thanks for the reply Tony. I think I have now sourced the parts. Looked at yours and I think my calcs are ok. I will share more later. I have for now something of a problem and staring at the drawing and you photos has drawn a blank. F2 and F2a I see the 3mm overhang each side from F2a to F2 but cant see how this fits when F2 fits flush to the fuselage side. See photos. I know it's probably obvious but unfortunately not to me Quote Link to comment Share on other sites More sharing options...
tony oneill 1 Posted March 9, 2019 Share Posted March 9, 2019 Yes i had the same problem. I ended up trimming F2A to fit behind F2 as its doubler to strengthen the wing mount. Then i stuck it in place and then fitted the U/C brace, after i fitted the 6mm undercarriage mount. I trimmed either end so the holes lined up. Quote Link to comment Share on other sites More sharing options...
Ramblin gruntfuttock Posted March 9, 2019 Author Share Posted March 9, 2019 Thanks Tony. I'll sort tomorrow and start some gluing Quote Link to comment Share on other sites More sharing options...
Chris Walby Posted March 9, 2019 Share Posted March 9, 2019 Jim, I used one of these as I had a couple of spares PM me with your address and I post it to you (although you could make one yourself or use studding), I can't see myself needing the spare one and you'll do me a favour of de-cluttering. Quote Link to comment Share on other sites More sharing options...
Old Geezer Posted March 10, 2019 Share Posted March 10, 2019 Now THAT'S what I call a proper motor mount box - unlike the delicate little thing that arrived on the front of my Wot4-e fuselage - that fell apart the first time the prop' clipped the grass on landing, not even hard enough to peck, let alone trip her up and flip her over. Sorry - off topic rant - but looking at the picture above I'm sure you can see my point. Quote Link to comment Share on other sites More sharing options...
Low pass Pete Posted March 10, 2019 Share Posted March 10, 2019 Ref F2 and 2A. These are laminated to align the wing dowel holes and 2A is 1/8 in wider each side. I have just put a slot onto the fuz doubler to provide a keyway for 2A. This helps to hold the assembly in place. I have also fitted some additional 1/2 in square behind F1 to give a more positive location. I am using a 62 4 stroke so I feel it wise to beef up some areas accordingly. I have also revised the tank floor as I intend not to have a tank hatch but fit the fuel tank from the rear through F2 Not having a hatch will mean more strength. Hope that is useful. Cheers Peter Quote Link to comment Share on other sites More sharing options...
Ramblin gruntfuttock Posted March 11, 2019 Author Share Posted March 11, 2019 Thanks Pete. I have gone Tony's route and cut the overhang off, but can see how the flange piece would add stability. I'm thinking I could put a stringer into the corner for a little added strength if needed. I will have a look later. Thanks for your advice Jim Quote Link to comment Share on other sites More sharing options...
Ramblin gruntfuttock Posted March 16, 2019 Author Share Posted March 16, 2019 Todays progress. Mainly thank goodness there is only one F5 because it has stretched my patience a little but hopefully sorted and left to harden overnight. The rest seems ok. Quote Link to comment Share on other sites More sharing options...
Ramblin gruntfuttock Posted March 16, 2019 Author Share Posted March 16, 2019 Quote Link to comment Share on other sites More sharing options...
Ramblin gruntfuttock Posted March 22, 2019 Author Share Posted March 22, 2019 Managed some time today to carry on with the fuselage. Think i got the upper rounded stringer right. Quote Link to comment Share on other sites More sharing options...
tony oneill 1 Posted March 22, 2019 Share Posted March 22, 2019 Neat work jim, looking good. Quote Link to comment Share on other sites More sharing options...
Ramblin gruntfuttock Posted March 24, 2019 Author Share Posted March 24, 2019 I'm thinking I have come across my first major mistake but may have a solution I hope and your advice would be greatly appreciated . I'll start with the photos Nothing is fitting around the cowling area, I've been studying the drawings and still don't see the problem but studying your photos I think I have set the triangular piece that butts to F1 to high then placed a 6mm stringer along the bottom. Also it all finishes flush at the front. I don't think this is correct as the 2 cowling pieces don't fit inside. If I'm right on this I think the solution s to cut this triangular piece to fit. Hope this makes sense to you and you can advise. Thanks Jim Quote Link to comment Share on other sites More sharing options...
tony oneill 1 Posted March 24, 2019 Share Posted March 24, 2019 Hi jim, my solution was to trim the triangular pieces to fit, as in this photo Quote Link to comment Share on other sites More sharing options...
Ramblin gruntfuttock Posted March 24, 2019 Author Share Posted March 24, 2019 Thanks Tony. I wasnt sure if it would affect something further on. Didn't think it would but thanks for the confirmation, much appreciated Jim Quote Link to comment Share on other sites More sharing options...
Low pass Pete Posted March 25, 2019 Share Posted March 25, 2019 Agree on that Tony. Sorry not to have replied earlier but we were away. Cheers Peter Quote Link to comment Share on other sites More sharing options...
Ramblin gruntfuttock Posted March 26, 2019 Author Share Posted March 26, 2019 Hi folks. I am reading the posts you are all making with great interest and would ask a favour, could you post a picture showing the problem/resolutions. Most of what you are saying is going over my head especially as i have not started the wings yet and am still working on the fuselage . I have found all of your photos of the fuselage an absolute boon as i progress and refer to them and the drawings together all the time. Thanks in anticipation of your help Jim Quote Link to comment Share on other sites More sharing options...
Chris Walby Posted March 26, 2019 Share Posted March 26, 2019 Hi Jim I'll go and take some photos! and post them on the general thread...If I can save someone else making the same mistake then its one less (although you probably wont make as many mistakes as me!) Quote Link to comment Share on other sites More sharing options...
Ramblin gruntfuttock Posted March 26, 2019 Author Share Posted March 26, 2019 Dont bank on it Chris. Spent last night doing F7 again, then discovering i was till wrong the photos helped no end.....they showed me i was miles out. ahhh well it adds to the experience 😁 Quote Link to comment Share on other sites More sharing options...
Chris Walby Posted March 26, 2019 Share Posted March 26, 2019 Hi, What's your issue with F7, I just followed the plan and LPP's photo? Quote Link to comment Share on other sites More sharing options...
Ramblin gruntfuttock Posted March 26, 2019 Author Share Posted March 26, 2019 I hadn't realised at the time but it was out of square consequently when i tried to fit the solid piece that follows it there was a gap. I had to remove F7 and the stringers top and bottom and the cross members between F6 and 7. I haven't glued it back together yet but the dry clamping looks ok. Also the bottom stringers for some reason are now to short so i need to add some on. Quote Link to comment Share on other sites More sharing options...
tony oneill 1 Posted March 27, 2019 Share Posted March 27, 2019 hi Jim, i noticed on another thread you said you were waiting on a leading edge. Don't know about others but there was no leading edge in the wood pack i received. i cut a piece of 6mm sheet a couple of mm's wider than the front of the wing formers. on mine this was about 16mm's. this gives a lip to butt the sheeting to and the leading edge is then planed and sanded to profile. at least that is my interpretation of the drawing. could another builder chip in on this? regards tony. Quote Link to comment Share on other sites More sharing options...
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