jeff2wings Posted April 19, 2019 Author Share Posted April 19, 2019 Well now the test stand is sorted out now,it's time to run up the Meteor 61 RV it runs !! and it runs very well ,once it's bedded in I will do some prop test and compare it to the standard engine Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted July 20, 2019 Author Share Posted July 20, 2019 After the success with the meteor I thought I would try something similar with a Merco but this time with reed induction ! going to 'cheat' and use the original crank but may have to make a piston (broke) Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted August 10, 2019 Author Share Posted August 10, 2019 Rather than use a reed(or clack valve for the ancient modeler ) have gone for a rear drum,I will try a reed later when I have worked out how to make one ! Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted August 11, 2019 Author Share Posted August 11, 2019 Well plenty of chips but no fish Quote Link to comment Share on other sites More sharing options...
Tim Flyer Posted August 11, 2019 Share Posted August 11, 2019 Very impressed with your work Jeff 😊. Well done ! Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted September 22, 2019 Author Share Posted September 22, 2019 Thanks Tim. Just finished refurb on this MAC (MDS) 10 cc,and just for fun,made the muffler into a double chamber to cut the db's Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted September 22, 2019 Author Share Posted September 22, 2019 Forgot to add this pic Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted October 12, 2019 Author Share Posted October 12, 2019 Latest project anyone like to guess what it is/was ?? Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted October 12, 2019 Share Posted October 12, 2019 Irvine Jeff ?? Beautiful work Edited By Denis Watkins on 12/10/2019 20:38:55 Quote Link to comment Share on other sites More sharing options...
ASH. Posted October 12, 2019 Share Posted October 12, 2019 Nice work Jeff. BTW nothing wrong with MDS. My 48 served me well and got me through my A test to everyone's amazement. Quote Link to comment Share on other sites More sharing options...
ASH. Posted October 12, 2019 Share Posted October 12, 2019 Nice work Jeff. BTW nothing wrong with MDS. My 48 served me well and got me through my A test to everyone's amazement. Quote Link to comment Share on other sites More sharing options...
Robin Colbourne Posted October 13, 2019 Share Posted October 13, 2019 Hi Jeff, Is your latest project based upon a Super Tigre 71? A rare beast if it is! Quote Link to comment Share on other sites More sharing options...
Robin Colbourne Posted October 13, 2019 Share Posted October 13, 2019 Posted by Robin Colbourne on 13/10/2019 01:26:29: Hi Jeff, Is your latest project based upon a Super Tigre 71? A rare beast if it is! For some reason I couldn't edit, this, so to be specific, I meant the Super Tigre G71 RV, although it could equally well be the G60 RV. Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted October 13, 2019 Author Share Posted October 13, 2019 It is indeed a G60 RV of 1966 vintage ! it was looking a bit sad when I got it,it looks like some one may have converted it to marine use at some stage by taking off most of the fins,I think it may also have a later piston fitted as it should have two rings not one ? anyway it only cost me a fiver, worth it for the carb alone ! Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted October 25, 2019 Author Share Posted October 25, 2019 A couple of pictures of the G 60 being machined for replacement fins Quote Link to comment Share on other sites More sharing options...
JACK Posted November 11, 2019 Share Posted November 11, 2019 very interesting thread this,l too have just taken possession of a project engine from ebay….cameras on the blink, but will post some pics asap---this engine is a petrol twin based around a pair of cylinders from crrc 50 size engines,the crankcase has been machined from billet alloy,and the standard of machining looks really good,the inlet ports have been blanked of with custom made plates,and a walbro carb sits on a machined in mount.....l am assuming that the internals I e crankshaft are custom madembut l suspect that the conrods and pistons will be from the original engines......the only markings on the engine are on the rear of the crankcase,where the letters"ftl" appear,it is a big chunk of engine,anyone know anything about it??,its a professional job,done by someone with a fair bit of knowledge,hopefully l can get it to run,but something is nagging at me about it,cant put my finger on it though,l am not really an engine man,but have dabbled in model engineering,any info will be most welcome. Quote Link to comment Share on other sites More sharing options...
Robin Colbourne Posted November 11, 2019 Share Posted November 11, 2019 Jack, It sounds a bit like the Quadra twin our department at RAE Farnborough had made for a UAV in the 1980s. It used two Quadra 50 cylinders. Quote Link to comment Share on other sites More sharing options...
JACK Posted November 12, 2019 Share Posted November 12, 2019 robin,that does sound very similar,my concern is the fuel mix transfer to the combustion chamber from the crankcase,the crrc 50 singles have the carb mounted direct to the cylinder,so l cant quite see how the fuel mix can transfer from the c/case to the transfer port and thence to the combustion chamber....l plan on doing a partial strip down for inspection,so hopefully all will be revealed,if it runs as good as it looks then l will be a very happy bunny Quote Link to comment Share on other sites More sharing options...
Robin Colbourne Posted November 12, 2019 Share Posted November 12, 2019 Jack, on the single cylinder engine, the bottom of the piston acts as the valve controlling flow from the carburettor into the crankcase. On the twin, I suspect a reed valve between the carburettor and crankcase does the job, in the same way as on a Cox Babe Bee 049. When the pistons are moving apart (going up the cylinders), there will be a negative pressure in the crankcase, which opens the reed valves allowing the air fuel mix in. When the pistons move towards each other (descending in the cylinders) the reed valve shuts, squeezing the fuel/air mixture up the transfer ports on each cylinder and into the combustion chambers. Quote Link to comment Share on other sites More sharing options...
JACK Posted November 13, 2019 Share Posted November 13, 2019 robin,thanks for that,what l am not sure of is whether the transfer ports are actually open to the crankcase as the cylinders are from a single cylinder engine,but,as l say,l cant see someone putting so much work in to the project with out having addressed that question,my camera should be fixed soon so l will post some pics,plus l plan to take the cylinders off for a look see at the internals Quote Link to comment Share on other sites More sharing options...
JACK Posted November 28, 2019 Share Posted November 28, 2019 regarding my posts on the twin l recently bought,l am not really sure what size prop to use on it,as l said,it appears to be around 100cc,using a pair of crrc piston/cylinders,each of around 50cc,giving a total of 100cc,so it will swing a fairly big prop,l intend using an rxcel ignition set,so can anyone give me an idea as to prop size?,not really a petrol head so this is likely a daft question!!!.....jack, Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted November 28, 2019 Share Posted November 28, 2019 26 x 10 - 12, 28 x10 Quote Link to comment Share on other sites More sharing options...
JACK Posted November 29, 2019 Share Posted November 29, 2019 thanks dennis!! Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted January 10, 2020 Author Share Posted January 10, 2020 So over the Christmas hols had a sort out in the workshop,starting with a second shelf for engine projects still plenty to do .I also completed some rebuilds for other people 1947 Owat Enya 45 and a Meteor 61 Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted February 25, 2020 Author Share Posted February 25, 2020 Not having anything much to do this afternoon decided to sort out a couple of Enyas oh the perils of castor ! both engines locked up but not any more ready to give more years of good service Quote Link to comment Share on other sites More sharing options...
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