SR 71 Posted March 24, 2020 Share Posted March 24, 2020 My friend in Cyprus had a starter that was far and away better than my Just Engines one, mine struggled with my 55cc DLE and it had a 4s lipo in it, and yes the switch had already departed, i glued a bit of ply on it, no more probs with the switch, cannot remember the name of my friends but it was good on 100cc , spun mine like it was not there, i will will contact him and get the details of it, i know it came from Germany Tony Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted March 24, 2020 Share Posted March 24, 2020 Morris Mini Motors list a range of high power starts, using motorcycle starter motors. Link to comment Share on other sites More sharing options...
Gary Spicer 1 Posted March 24, 2020 Share Posted March 24, 2020 Does 6900 rpm max revs sound about right for a 20x6 on a Laser 180? Model is DB Nieuport 24 (only a cheap tacho) Thanks Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted March 24, 2020 Share Posted March 24, 2020 Posted by Gary Spicer 1 on 24/03/2020 20:17:45: Does 6900 rpm max revs sound about right for a 20x6 on a Laser 180? Model is DB Nieuport 24 (only a cheap tacho) Thanks My 200v runs a 20x6 at around 6,500 rpm so I'd say that's about right. Mines in a Mick Reeves 1/4 scale Camel, wt around 7kg, flew fine until a fuel line came off one of the carbs, engine didn't stop but didn't have enough power for a go around so landed in long grass flipping model over. Link to comment Share on other sites More sharing options...
Jon H Posted March 24, 2020 Author Share Posted March 24, 2020 Posted by Gary Spicer 1 on 24/03/2020 20:17:45: Does 6900 rpm max revs sound about right for a 20x6 on a Laser 180? Model is DB Nieuport 24 (only a cheap tacho) Thanks i look for 6600-7200 depending on the brand. The cheap nasty hobbyking 20x6 on my stampe does 6700 but another i have (i forget the brand) does 7000. 200v's are normally faster than a 180 on an identical prop. Link to comment Share on other sites More sharing options...
Gary Spicer 1 Posted March 24, 2020 Share Posted March 24, 2020 Thanks Frank and Jon, sounds like I am in the ball park, its a birch wood ply prop cant remember the brand. AUW of the Nieuport 19lbs with 16oz tank. 92" span. Link to comment Share on other sites More sharing options...
Jon H Posted March 25, 2020 Author Share Posted March 25, 2020 Posted by Gary Spicer 1 on 24/03/2020 23:26:32: Thanks Frank and Jon, sounds like I am in the ball park, its a birch wood ply prop cant remember the brand. AUW of the Nieuport 19lbs with 16oz tank. 92" span. It will be fine. Takeoff at just over half throttle and then probably leave it there most of the time. Link to comment Share on other sites More sharing options...
Gary Spicer 1 Posted March 25, 2020 Share Posted March 25, 2020 Thanks Jon, I ran a tank trough it yesterday (plane pinned down in the garden) playing at around half throttle got just over 30 minutes! Link to comment Share on other sites More sharing options...
Jon H Posted March 25, 2020 Author Share Posted March 25, 2020 I hope you gave it a good thrashing Link to comment Share on other sites More sharing options...
Gary Spicer 1 Posted March 25, 2020 Share Posted March 25, 2020 I certainly did! I was very pleased how long it ran for on 16oz Link to comment Share on other sites More sharing options...
Jon H Posted March 25, 2020 Author Share Posted March 25, 2020 they are quite economical if tuned up nicely and run on the right fuel. I think i had a 14oz in my stampe and it was certainly good for at least 25 minutes as i flew that long on a number of occasions and still had some left. Link to comment Share on other sites More sharing options...
kevin b Posted March 25, 2020 Share Posted March 25, 2020 Slightly off topic, but I think Jon should self isolate at the workshop, whilst all the other staff are off. He will be able to use the machinery to turn out lots of lovely new engines ! Link to comment Share on other sites More sharing options...
Keith England 1 Posted March 25, 2020 Share Posted March 25, 2020 Posted by kevin b on 25/03/2020 17:30:37: Slightly off topic, but I think Jon should self isolate at the workshop, whilst all the other staff are off. He will be able to use the machinery to turn out lots of lovely new engines ! He looks like he is doing pretty well as it is 🤓 Link to comment Share on other sites More sharing options...
Jon H Posted March 26, 2020 Author Share Posted March 26, 2020 Posted by kevin b on 25/03/2020 17:30:37: Slightly off topic, but I think Jon should self isolate at the workshop, whilst all the other staff are off. He will be able to use the machinery to turn out lots of lovely new engines ! Its a nice idea but i need the others to run the machines. Also, if supplies of ali and steel continue to decline we will all be twiddling our thumbs anyway Link to comment Share on other sites More sharing options...
Bucksboy Posted April 2, 2020 Share Posted April 2, 2020 Jon, I started this Brian Taylor Bf109 about 5 years ago but then work got in the way. Its 3/4 built but I'm afraid to say I totally ignored your advice about tank height. I've followed his instructions and placed the tank where he suggested. Underneath the tank is the flight battery and the throttle servo. So now I've got time to advance the plane but I've looked again at the tank position. Moving the tank would be very hard. I could try turning the engine upright but fear it would poke out the top of the cowl. Or, I could leave it as. The height difference is about 4", what would happen if I left it like it is? The picture shows the approx. tank feed and the carb inlet with the two short red lines. The curved lines top and bottom is the approx. cowl position. What to do? Thanks Bucks Link to comment Share on other sites More sharing options...
Nigel R Posted April 2, 2020 Share Posted April 2, 2020 Have you space to squeeze a tiny tank, say 2oz, at the correct height? If so you could do a chicken hopper set up. Steve Dunne I believe has one in a Spit. There was a thread on them here: **LINK** Link to comment Share on other sites More sharing options...
Jon H Posted April 2, 2020 Author Share Posted April 2, 2020 Posted by Bucksboy on 02/04/2020 17:19:28: Or, I could leave it as. The height difference is about 4", what would happen if I left it like it is? It will stop whenever you go upside down, which is not ideal. That angled plate behind the engine at the bottom of the fuselage, what lives in there? I would be tempted to just chop through that angled plate and stuff the tank in there. Also what size tank are you trying to use? even 10oz would probably do if space is tight. No need to fit a bucket Edited By Jon - Laser Engines on 02/04/2020 17:37:48 Link to comment Share on other sites More sharing options...
Nigel R Posted April 2, 2020 Share Posted April 2, 2020 There'll be lumps coming out the wing if the tank goes there, that bay looks quite short. Not an impossible bit of woodwork though. Link to comment Share on other sites More sharing options...
Martin McIntosh Posted April 2, 2020 Share Posted April 2, 2020 From my experience with two Spits and a Stampe, all flown with Laser 180`s you should have no problem considering that inverted flight with the 109 is only likely to be brief. My Stampe does have a double tank set up (not chicken hopper) with a 9 at the top and a 6 underneath it so the effective fuel head is the 9oz and it will fly inverted all day. Link to comment Share on other sites More sharing options...
Bucksboy Posted April 2, 2020 Share Posted April 2, 2020 It looks like the saw is coming out tomorrow then. Thanks for the advice gents, I’ll just have to summon up the courage and set to. Of course the answer I wanted was ‘not a problem, don’t worry about it’. Still, there are bigger problems than this so I’ll crack on with it. Thank you, I’ll post some more pictures when surgery is complete. 😄 Link to comment Share on other sites More sharing options...
kevin b Posted April 2, 2020 Share Posted April 2, 2020 Posted by Jon - Laser Engines on 26/03/2020 08:13:51: Its a nice idea but i need the others to run the machines. Also, if supplies of ali and steel continue to decline we will all be twiddling our thumbs anyway Ah, plenty of time for development work then. On a slightly more serious note, Some time ago I bought a cheap Chinese petrol strimmer to play with the engine. It has a copy (?) of the Honda 26cc OHC engine fitted to it (maybe I will have time now !). The question I ask, is why model engine manufacturers haven't developed OHC engines ? The advantages are obvious, but I assume there must be some disadvantages otherwise we would be seeing them. Particularly petrol versions. Now there's a thought. An inline twin Laser with double overhead cams (One has to dream). Link to comment Share on other sites More sharing options...
Jon H Posted April 2, 2020 Author Share Posted April 2, 2020 OHC engines are too tall As for an inline twin i already have 3 drawn up are ready to manufacture as well as 3 other things. Not that it matters, the drawings for my radial were finished about 8 years ago and nothing has been done Link to comment Share on other sites More sharing options...
SR 71 Posted April 3, 2020 Share Posted April 3, 2020 If i win the lottery Jon we will set you up to produce your dreams Link to comment Share on other sites More sharing options...
Jon H Posted April 3, 2020 Author Share Posted April 3, 2020 Sounds like a plan. Radials for all! I also think one of the first things i would do is make a reduction drive. Get propeller rpm down for much reduced noise. I already have the design done. It would fit our 100, 120, 150,155,160v, 200v, 240v and 300v with only one component change needed per engine and would allow a 200v to swing something like 22x14 3 blade or 24x14 2 blade at a gentle 4400rpm on the prop. Loads of thrust, nice and quiet. Oh yes, it also would not make the engine more than a few mm longer than it currently is, and could be retrofitted to old engines. Would be kinda cool i think. I best keep dreaming. Link to comment Share on other sites More sharing options...
Dirk Witvrouwen 1 Posted April 3, 2020 Share Posted April 3, 2020 And Jon, don't forget a stylish back-mouted integrated starter for the radial 😁 Link to comment Share on other sites More sharing options...
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