Tim Cheal

Airports are very constrained in this respect, you have to use the runway. So, you choose the one 'into wind' (i.e the one with a headwind component not the one with a tailwind component!). I suspect the BMFA guidelines intend this philosophy to apply to models and flying sites as well. Tim

Thanks to and Tim, I have already changed the bearings. I have just put it back together, so I will run it later today and let you know how I get on (I will take it apart again and try the dremel trick if all else has failed!!). Thanks again. Tim

Thanks again guys. Piston pictures for you Dennis: Robert and one tenor, I have stripped the carb and can't find anything at all: All your help much appreciated, I will fit a new one, but would like to understand what happened to this one! Tim

Thanks for the feedback and help guys. I have stripped the carb (to be honest I didn't know you could break it down so easily by winding the slow running needle in) and there was nothing there. Liner is out and to be honest I am not sure what I am looking for. It's got some scoring, and its not very shiny, see pictures attached: Any further advice or comments gratefully received - new OS 55 on order! Thanks again Tim

Here is the corned/crankcase I described above:

Hi Guys I wonder if I can get get involved as I have a similar problem. I have a 2 year old OS 55AX that has been trouble free for the whole time, and flown over 200 flights in that time in a Pulse XT40. Last flight but one I dead-sticked, unusual but nothing serious I thought. But again, on the last flight it dead-sticked again. This time I noticed the engine was very hot and it also "smelled" hot. So, I ground ran it and it ran fine, but when I held it vertical at full throttle it started to hunt up and down. I suspected fuel flow and so changed out the fuel line, no change but I thought the tank might have a leak, so I put in a new tank and more fuel lines, but still no improvement. Having read this thread I decided to change the carburettor O ring, and for good measure the needle itself, but while waiting for delivery of the O ring I ran it again. It got very hot again, and I decided to have a go at changing the bearings. So, ordered those, and they arrived very quickly so changed those out. After the bearing change it seemed to have solved the problem, and I was dead chuffed, but I took it to the field and it played up again, hunting at high revs and eventually stopping. It was very hot again! The O ring and needle arrived and were changed, but no improvement (although in every case if I run it from cold it runs for about 5 minutes trouble free, then gets hot again and stops). I have now changed the bearings, the O ring, the needle, flushed through the carb fuel inlet with fuel (numerous times) and forced air with a bicycle pump through the fuel in;et to the carb. I can't think what else I can do (although I have not stripped the carb as I am not sure what to do here, but I have removed the needle and its 'nipple' but it revealed nothing). Although I replaced the gasket on the rear cover is it possible air is getting in here? Would this cause the overheating? Would some silicone gasket sealer be a good idea on the rear cover? I have a photo of the engine taken with the rear cover off (on next post). What surprised me when I took the bearing out initially is that the conrod runs in a groove in the crankcase - is this correct or has the groove been worn while running? (although the conrod looks ok and not damaged or worn). Any advice grateful received as I am now at a complete loss - and I fear the engine may be too! Tim         Edited By Tim Cheal on 06/06/2018 21:33:52

Bumping this back again in case anyone looks over the weekend. It was a beautiful flying day this afternoon in Cheshire. Tim

Thanks Bob That may be the case, but I think the organisers are hoping some local club will want to get involved and they can then discuss the details and set up (if it is at all possible) Tim

Hi All My Uncle who lives near Wythal in Birmingham is a member of the organising committee for the Wythal Carnival. They would like to celebrate RAF 100 at the Carnival and thought an appropriate way would be to have some model flying at the carnival on Sunday 5th August. He has approached the local clubs by email, but has not heard anything back as yet. I realise these things are not easy, but it may be important to local clubs so wanted to give them the chance to accept or decline this fantastic opportunity for some PR. I am afraid that I don't know anything about the park or its suitability for model flying, but I am told it is very large. If anybody is interested please follow the instructions in the below (extracted from an email he sent me) or respond on this forum and I will make the necessary contact arrangements.

Thats awesome. Funnily enough I couldnt get it to work on my iPad, but on my laptop the ability to scan around (with the mouse) is fantastic. That should produce some really great videos. Well done. Tim

Thanks for the info Colin, it does look like a good deal. Tim

Hi Colin I had never heard of Readly, but it looks a great way to get loads of magazines (including modelling ones) online. Any drawbacks, or is it £7.99 per month for unlimited access to all those mags? Tim

Do you remember the Thunderbirds episode, very similar!!

...................."Then they smashed them all to bits" (You will have to certain age to remember the Cadburys Smash advert that I refer too). Seasons greetings and a Happy New Year to all. Tim

Hi All I was flying today near Manchester, cold (barely above 1 degrees) but a crisp clear morning with a very bright sun. I have never found a great solution for flying in bright sun, so last year I bought some varifocal prescription sunglasses (not reactolight, but I chose a brown lens colour to match the frames). Today I just couldnt get on with them, even not looking at the sun I was suffering with disorientation and glare. So, I thought it would be worth trying my normal glasses, which are clear, and the overglasses I bought last year. There was a marked improvement and I have decided that the normal glasses with the overglasses is a much better solution. The overglasses I got from Amazon - Rapid Eyewear, which I think has already been mentioned. They were about £14, but I have just looked I think you can get them for £12.99. I cant say why they were so much better, but possibly because they stop the glare from the sides as well as the front. Best wishes - is it too early to say Seasons greetings? Tim

I have to compliment you Tony on the article in December RCM and E. It really highlights the level of success, and disappointment, you experienced during the development. And for someone like me who has built 2 models from plans, its actually encouraging that, even for the experts, not every flight is a success! Your comment about descending when the aircraft is yawed in the hover is spooky, because it replicates exactly what the real aircraft did (I think I mentioned I flew Harriers in the RAF, actually I flew GR3s, AV8Bs and the GR5/7) because the yaw thrust duct (puffer duct) contributed nothing to total lift (pitching up or down, and small amounts of roll, produced only a downward thrust from the appropriate puffer duct, so it contributed to the overall lift). Well done, and it you do decide to get involved in a RTF version, count me in!! Finally, I am intrigued to know who the AVM mentioned in the Autumn Special editorial was, as I probably flew with him in the 80s and 90s. Fantastic work, and well done again. Tim Cheal