Ron Gray Posted May 31, 2022 Share Posted May 31, 2022 Anyone interested in the surgery etc that will be required to fit a Laser 200 in-line twin into my just acquired fairly well used 82” Hurri? It probably won’t start until next week and, on he face of it, looks like it will be more difficult than the 160 in-line fitting in the Mustang. I won’t be offended if there’s a resounding silence! 4 Quote Link to comment Share on other sites More sharing options...
Jesus Cardin Posted May 31, 2022 Share Posted May 31, 2022 Interested both in the surgery as well as in your cooling solution! Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted May 31, 2022 Share Posted May 31, 2022 Bring it on! Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted June 1, 2022 Author Share Posted June 1, 2022 8 hours ago, Jesus Cardin said: your cooling solution! Yes, that is the main concern! I’m planning on ducting the hot air out through the belly rad which means taking it through the wing (surgery!!!) which, in turn, means relocating radio gear / servos. But it’s getting the cooling air in that is more of a concern! Jon (Laser) has suggested that the gap between the spinner and fuse (oil spill shroud on full-size) could be sufficient without having to resort to cutting a chin hole. This maybe ok when it’s up in the air but presents a potential overheating problem when in the pits, so I’m thinking of some form of extract fan that can be clipped onto the exit opening which will draw air through and can also be used on the Mustang. I am even toying with the idea of a small fan (or edf) unit in the hot air duct! Any suggestions / ideas will be greatly received. 1 Quote Link to comment Share on other sites More sharing options...
Nigel R Posted June 1, 2022 Share Posted June 1, 2022 18 minutes ago, Ron Gray said: the gap between the spinner and fuse (oil spill shroud on full-size) could be sufficient without having to resort to cutting a chin hole sounds like quite a small inlet - any photos? could you engineer some kind of chin hatch? could be locked closed just before take off? Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted June 1, 2022 Share Posted June 1, 2022 Maybe Jon needs to do a water cooled version then you could have scale radiators............................ 1 Quote Link to comment Share on other sites More sharing options...
Jon H Posted June 1, 2022 Share Posted June 1, 2022 (edited) 23 minutes ago, Frank Skilbeck said: Maybe Jon needs to do a water cooled version then you could have scale radiators............................ in my dreams ? It would solve a number of problems. Edited June 1, 2022 by Jon - Laser Engines Quote Link to comment Share on other sites More sharing options...
Nick Somerville Posted June 1, 2022 Share Posted June 1, 2022 38 minutes ago, Frank Skilbeck said: Maybe Jon needs to do a water cooled version then you could have scale radiators............................ Please don’t sidetrack Jon from radials! 1 Quote Link to comment Share on other sites More sharing options...
Eric Robson Posted June 1, 2022 Share Posted June 1, 2022 40 minutes ago, Jon - Laser Engines said: in my dreams ? It would solve a number of problems. It would create a lot more, draining the system to remove the wing, leaking hoses, water soaked balsa, wet electrics, antifreeze for winter flying, ? 1 Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted June 1, 2022 Author Share Posted June 1, 2022 1 hour ago, Nigel R said: sounds like quite a small inlet - any photos This is a shot Jon sent me Here's some more Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted June 1, 2022 Author Share Posted June 1, 2022 (edited) EDF unit for the hot air extract Servo Shop, could even link it to the throttle with its own throttle curve! Edited June 1, 2022 by Ron Gray 1 Quote Link to comment Share on other sites More sharing options...
Nick Cripps Posted June 1, 2022 Share Posted June 1, 2022 You might be better off with a computer cooling fan for slow-moving air. Lots of sizes available on eBay but will need a 12V supply. Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted June 1, 2022 Author Share Posted June 1, 2022 I had thought of a Raspberry Pi type fan, similar to the one I got for cooling my ELRS Tx module as they run off lower voltages. Quote Link to comment Share on other sites More sharing options...
J D 8 - Moderator Posted June 1, 2022 Share Posted June 1, 2022 Just an idea, how about a Hurricane model fitted with a Volks air filter [ front left open] Quote Link to comment Share on other sites More sharing options...
Nigel R Posted June 1, 2022 Share Posted June 1, 2022 The gap around the spinner could be really effective and may have a lot more area than you first expect. Getting the spinner small enough and the shape right on the front of the cowl would be critical though. Worst case you'd have to open up a small inlet duct on the underside. The two scale blisters (4 and 8 o'clock positions) could be made a bit larger than scale if needed? Mind you if the air duct outlet in the radiator has enough negative pressure it will cause a lot of airflow even through a narrow spinner / cowl gap. Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted June 1, 2022 Share Posted June 1, 2022 Just Thinking: but could you cut a hole in the bottom of the cowling and make a piece a couple of millimetres larger and fix it five millimetres away on the inside leaving a lot of ventilation space and not noticeable in the air. Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted June 1, 2022 Author Share Posted June 1, 2022 1 hour ago, Nigel R said: if the air duct outlet in the radiator has enough negative pressure it will cause a lot of airflow even through a narrow spinner / cowl gap. Good point, if I build in the drop flap on the rad too that will give it a slight lip which will increase the neg pressure - thanks @Nigel R I think that I'm still going to need a forced air cooling system for when its in the pits though. My experience of both the 160i in the Mustang and the 200i in the Sportster has made me very wary of any 'standing time' with the engine running. Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted June 1, 2022 Share Posted June 1, 2022 Maybe you need some of those plug in coolers/blowers the F1 cars use for when they are in the pits. Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted June 1, 2022 Author Share Posted June 1, 2022 6 minutes ago, Paul De Tourtoulon said: Just Thinking: but could you cut a hole in the bottom of the cowling and make a piece a couple of millimetres larger and fix it five millimetres away on the inside leaving a lot of ventilation space and not noticeable in the air. Now that's a good idea, a recessed panel with an air gap! Keep the ideas coming in guys! Just had a closer look at the paint finish, it has been weathered and then what looks like a fairly thick fuel proofing coating which has given it a very rough feel, possibly too thick resulting in orange peel. So I've made the first decision which is to rub it back! Now here's a thought, convert it to a tropical version which will give me a nice big under cowl air intake! Quote Link to comment Share on other sites More sharing options...
Kevin Fairgrieve Posted June 1, 2022 Share Posted June 1, 2022 If you are going tropical, you also need something just a little different! 1 Quote Link to comment Share on other sites More sharing options...
Eric Robson Posted June 1, 2022 Share Posted June 1, 2022 The picture of the one with the tropical filter looks like the sun has wrinkled the solar film covering on the fairing from the cowl to the filter. I believe Brian Taylor used a small flap on the underside of his Spitfire cowl which was propped open for running and closed for judging. I have seen mesh used on a cowl to let the air through and when painted it was not too noticeable. 1 Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted June 1, 2022 Author Share Posted June 1, 2022 Well it won’t be entered into any comps and I won’t let any of you lot close enough to check it! 1 1 Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted June 1, 2022 Author Share Posted June 1, 2022 (edited) Another interesting shot of a tropical one (Mk II?), note the cowl ring / oil catch and that the belly rad flap is open Edited June 1, 2022 by Ron Gray Quote Link to comment Share on other sites More sharing options...
Jesus Cardin Posted June 1, 2022 Share Posted June 1, 2022 Ron, why do not you go the Brian Taylor route with his 70" Hurricane design? He introduced a small hinged lip just below the cowl, so it could be kept gravity closed for real look on the ground and then opened and kept so with a clothes clip or magnet. As far as I know, he used the same fresh air intake for his 69" Spitfires MKI and XIV/XIX as well as for his 70" Hurricane, so you have plenty design plans to check. Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted June 2, 2022 Share Posted June 2, 2022 11 hours ago, Eric Robson said: I believe Brian Taylor used a small flap on the underside of his Spitfire cowl which was propped open for running and closed for judging. I have seen mesh used on a cowl to let the air through and when painted it was not too noticeable. Like a 'cheat hole' that we used to use on ducted fans, why not with a servo opening it,,, Quote Link to comment Share on other sites More sharing options...
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