Paul Jefferies
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URGENT NOTICE : SCALE WEEKEND PREVENT CANCELLATION BY BOOKING AHEAD, ONLINE, BY THURSDAY. www.shuttleworth.org/events/modelair-scale-model SHUTTLEWORTH NEED TO SEE A SIGNIFICANT INCREASE IN PRE-BOOKINGS BY THURSDAY. THIS IS CRITICAL. If online bookings are not forthcoming, Shuttleworth will have no option but to cancel, to avoid the risk of not being covid-secure. Shuttleworth has a legal obligation to collect NHS Test and Trace details, and this is managed by capturing the required details online during the pre-booking process. Please share this with your modelling colleagues as a matter of urgency. Thank you LET'S WORK TOGETHER TO SAVE SCALE WEEKEND
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Nats - Chuck and Duck.......
Paul Jefferies replied to Paul Jefferies's topic in All Things Model Flying
Thanks guys. I have looked on the BMFA website and I have to say that I think the tightening up was necessary. I have seen some incredibly stupid (and dangerous) behaviour in the past and there are plenty of videos on youtube which prove the point. For many people the Chuck n Duck is the highlight of the Nationals and it would be a tragedy if it had to be stopped altogether because of a few idiots. Paul -
I usually go to the Nats on the Sunday, a major part of which is the Chuck and Duck in the evening. There is a danger that it might not work out this year so........ is there a Chuck and Duck on the Saturday evening? Paul Edited By Paul Jefferies on 17/08/2018 08:22:00
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State of the Art R/C - in 1953!
Paul Jefferies replied to Peter Christy's topic in All Things Model Flying
Great stuff!....... Thanks Peter. -
Models and Engines Stolen
Paul Jefferies replied to Biggles' Elder Brother - Moderator's topic in All Things Model Flying
Keep an eye on ebay....... A Mills .75 that was stolen from me at Old Warden eventually turned up two years later. I bid for it and got it. I then asked for my money back but the seller claimed they bought it at Weston Park and then stopped answering messages. I informed the police and even supplied them with the seller's name and address but they couldn't do anything because I couldn't prove that the seller knew it was stolen goods......... But at least I got my best Mills back! Edited By Paul Jefferies on 06/11/2017 23:15:01 Edited By Paul Jefferies on 06/11/2017 23:16:50 -
+1 for ferrets....... Also hawkers. Try to find a local field sports enthusiast, they are always looking for new places to hunt. Paul
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New generation of Fake Spektrum Receivers
Paul Jefferies replied to Paul Marsh's topic in General Radio Discussion
Is there a way to spot a fake........ apart from the price? Paul -
Who needs special effects and computer graphics when you can see the real thing....... 'Great film, thanks!
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Certainly beef up the dihedral braces but all this talk of it ballooning under power probably means that the model had too much power or possibly not enough down thrust....... Ballooning is not a function of power but of too much speed caused by too much power. Back in the day these models didn't have much power and the problem didn't arise until it got into a dive when the speed would build up and it would pull itself out....... That's what they call stability and the J60 had loads if it! If flown as it was designed to be flown it should stooge around not far above the stall, hopefully achieving a modest climb and when the motor stops you should hardly notice the difference except that it starts a gentle descent. Most people seem to want more exciting flying these days and yes, if that's what you want you want, build a Super 60 but please don't modify such an iconic design..... just fly it as it was designed to be flown. Paul
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'Done it !!! Thanks everyone for your suggestions..... Denis, the engine isn't "precious" as such and I think your idea would have worked but I would be reluctant to drill holes in it unless it was the very last resort. Engine Doc you were right, it was a bit like a Chinese puzzle....... I put it at bdc and jiggled the big end, the piston and the crankshaft plus a little more force than I felt comfortable with and it went. Having fitted the new crankshaft, the next challenge was putting it all back together again. The tolerances on these engines are incredibly tight and it really didn't want to go. The problem was that the end of the crank pin has very sharp edges and, because it wasn't perfectly aligned, it tended to dig into the much softer aluminium big end. In the end I had to use very fine wet and dry to take the sharp edge off the crank pin and with some oil and a little persuasion, it went back in. I have now run the engine and it is "as new"! Many thanks to all for your input. Paul Edited By Paul Jefferies on 06/08/2017 16:49:26
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John, thanks for your suggestion, I think I understand what you are getting at but having made up the ring there would be no way to get it over the piston down inside the crankcase and then, because at tdc the gudgeon pin is still below the top of the crankcase, there would be no way to access the screw in order to turn it ......... or have I not understood you correctly?
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I have removed both the head fins and the cylinder liner, leaving the piston loose in the crankcase but still attached to the crank via the con-rod. I think the "sliding bronze case" is a less than perfect translation from the Czech and it refers to what we would call a bronze bearing. It does have a bronze bearing which was pressed or sweated in but it certainly doesn't slide........ There is a small amount of fore and aft movement of the crankshaft in it's bearing but not enough to allow removal of the con-rod. It is very nicely made to quite close tolerances! Paul
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Yes, that's the engine. I can't take the piston and con-rod out together so I need to separate them by removing the gudgeon pin.......... but I can't remove the gudgeon pin with it all in situ. There has to be a way to do it but I just can't see it! Paul
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Does anyone have any experience of dismantling an MP Jet .040? I am trying to replace the crankshaft but I can't get the old one out because I can't get the con-rod off the crank pin. I have removed the liner but, unlike a Mills, there is not enough play to "jiggle" the whole piston/conrod assembly out in one. It looks as though it was assembled by inserting the gudgeon pin through the hole in the crankcase where the carburettor assembly screws in but there seems to be no way to remove it by the same route....... I am sure there must be someone out there who has had this problem before so any advice would be much appreciated. Paul
