Jim Hearnden 1 Posted March 3 Share Posted March 3 I will be getting a YS140 in the next week or so. My first 4 stroke ever! Also what do I build for it, hunting about the Loaded Dice 3 through Sarik looks good. Might be a good way to get my Power B Certificate later in the year? I must admit the Seagull Ultimate (https://stevewebb.co.uk/index.php?pid=SEA389&area=Aircraft) is another option, but never done ARTFs & that seems a lot to spend on one. Quote Link to comment Share on other sites More sharing options...
Peter Jenkins Posted March 3 Share Posted March 3 Hi Jim Firstly well done on getting your first YS. They are highly specialised engines used primarily in competition aerobatics before the advent of electric power. They are more powerful than you would expect for that size of engine as they are supercharged and fuel injected. They require some special handling but I'm assuming that you have read up about it and have the necessary understanding of this device. They also need an anti vibration mount and they can be hard to come by. The Hyde mount (made by Chip Hyde) is still the go to mount for a YS. £360 for an ARTF that has a 10 lb weight is quite reasonable IMHO. I would just point out that the YS was aimed at aircraft that weighed 11 lb. If you were to buy the sort of aircraft that the YS used to go into (a 2 mtr pattern aircraft or F3A) you'd be talking about paying £2,000 +. The Ultimate will be a bit overpowered with the YS and it is a good deal heavier than a 20 cc petrol engine. You are no doubt aware that the YS needs high nitro fuel, ideally 30% but that's now all but impossible to get. 20% seems to be the limit for legal reasons. Enjoy and do let us know how you get on. Quote Link to comment Share on other sites More sharing options...
Rod Parsons 1 Posted March 9 Share Posted March 9 Hello Jim, Watching with interest, and keen to see how you get on. Had a 140 ‘limited’ about 18 years ago, and they are very specialised engines. Have you looked into availability of engine mounts and exhausts, before committing? Quote Link to comment Share on other sites More sharing options...
Jason Channing Posted March 9 Share Posted March 9 (edited) On 03/03/2024 at 20:41, Jim Hearnden 1 said: I will be getting a YS140 in the next week or so. My first 4 stroke ever! Also what do I build for it, hunting about the Loaded Dice 3 through Sarik looks good. Might be a good way to get my Power B Certificate later in the year? I must admit the Seagull Ultimate (https://stevewebb.co.uk/index.php?pid=SEA389&area=Aircraft) is another option, but never done ARTFs & that seems a lot to spend on one. On 03/03/2024 at 20:41, Jim Hearnden 1 said: I will be getting a YS140 in the next week or so. My first 4 stroke ever! Also what do I build for it, hunting about the Loaded Dice 3 through Sarik looks good. Might be a good way to get my Power B Certificate later in the year? I must admit the Seagull Ultimate (https://stevewebb.co.uk/index.php?pid=SEA389&area=Aircraft) is another option, but never done ARTFs & that seems a lot to spend on one. Hi Jim. I still use YS on a daily basis, If you need 30% fuel I always have it in stock(I have the EPL for this fuel) however 25% is kinder on the OS plugs and the 20% fuel runs well on the YS although not quite as much torque compared to thje 30%. These days not many people use the YS in the UK, now however the in the USA market its a fairly popular engine used in regular sports models as well. I have several hyde mounts although in my 80 size and less I use a hard mount. 25% is the limit you can buy without a EPL Edited March 9 by Jason Channing Fuel 2 Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted March 9 Share Posted March 9 I'm sure you'll love it Jim. Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted March 10 Share Posted March 10 Hi Jim I also use YS engines. And still have a nib 63 and a used reconned 140 tucked away. Last time I used a 140 was in a Flair Leo F3a type model. While fitting it I never considered ground clearance suitable for the 140 . They are a very powerful engine and requir a suitable prop to tame thier power. The Leo has a swept back carbon U/C and the biggest dia prop with useable ground clearance was 14 inch. Ended up fitting a 14 x14 APC . The engine would still rev to around 10k on the ground Plane flew wonderfully but took 5 attempts to land due to the prop still pulling air at idle and not slowing the model! . Leo now fitted with an older YS 90 . Still very powerful , more than an OS 120 fs I reckon. Dont forget YS engines operate on a pressurised fuel system and need a tank capable of running at 10 to 13 psi. Choose tank carfully. Great engines but do like the nitro. I use 20% SMC synthetic and never had any issuse. Now SMC has gone will have to sort another fuel ? Quote Link to comment Share on other sites More sharing options...
Jim Hearnden 1 Posted March 10 Author Share Posted March 10 10 hours ago, Engine Doctor said: Hi Jim Don't forget YS engines operate on a pressurised fuel system and need a tank capable of running at 10 to 13 psi. Great engines but do like the nitro. I use 20% SMC synthetic and never had any issues. Now SMC has gone will have to sort another fuel ? The 140DZ doesn't pressurise the tank it pressurises the fuel feed. Mine has come with nearly a full gallon of 30% which is good. It also has an exhaust system like a church organ pipe. Hiding this in a fuselage will be a challenge. Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted March 11 Share Posted March 11 Hi Jim . I didnt realise they had moved to a normal fuel pump . Plumbing looks far more straight forward and no fuel squirting 10ft if you forgot to release the pressure 😉. Will have to see it in action . Quote Link to comment Share on other sites More sharing options...
Jason Channing Posted March 11 Share Posted March 11 (edited) On 10/03/2024 at 10:12, Engine Doctor said: Hi Jim I also use YS engines. And still have a nib 63 and a used reconned 140 tucked away. Last time I used a 140 was in a Flair Leo F3a type model. While fitting it I never considered ground clearance suitable for the 140 . They are a very powerful engine and requir a suitable prop to tame thier power. The Leo has a swept back carbon U/C and the biggest dia prop with useable ground clearance was 14 inch. Ended up fitting a 14 x14 APC . The engine would still rev to around 10k on the ground Plane flew wonderfully but took 5 attempts to land due to the prop still pulling air at idle and not slowing the model! . Leo now fitted with an older YS 90 . Still very powerful , more than an OS 120 fs I reckon. Dont forget YS engines operate on a pressurised fuel system and need a tank capable of running at 10 to 13 psi. Choose tank carfully. Great engines but do like the nitro. I use 20% SMC synthetic and never had any issuse. Now SMC has gone will have to sort another fuel ? Normal pressure from the tank averages out at 7psi although from the factory it can vary up to 9 psi, there's no point it being any higher as the purpose is to deliver the fuel to the regulator, then onto the Carb. a little bit simplified but that's the general gist. Any decent tanks such as Kavan will take 10 psi quite easily and All I ever do is solder on little barbs to stop the tubing coming off. SMC are still trading after it was sold. Edited March 11 by Jason Channing Quote Link to comment Share on other sites More sharing options...
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