Phil 9 Posted September 4, 2009 Share Posted September 4, 2009 Is the only advantage of a four stroke motor the sound it makes. Or I am i missing something. ( i suspect I am) Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted September 4, 2009 Share Posted September 4, 2009 They are better at swinging large props as they have more torque.They look nicer.Its man jewellery Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted September 4, 2009 Share Posted September 4, 2009 Also more fuel efficient and more acceptable sound to the neighbours, assuming you were referring to the slightly more realistic sound of a 4 stroke. Quote Link to comment Share on other sites More sharing options...
Phil 9 Posted September 4, 2009 Author Share Posted September 4, 2009 Yes i was Martin. I guess i will stay on two strokes for now Quote Link to comment Share on other sites More sharing options...
batcho99 Posted September 5, 2009 Share Posted September 5, 2009 Once you've gone four banger you will never go back! Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted September 5, 2009 Share Posted September 5, 2009 Bit like motor bikes isn't it ? Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted September 5, 2009 Share Posted September 5, 2009 I think a lot depends on what sort of models you like flying & how you like flying them.....I like the sort of effortless way a 4 stroke goes about its business of hauling a model around (you will need a much bigger 4 stroke than a 2 stroke by the way......if you work on 50% bigger...ie replace a 60 2 stroke with a 90 4 stroke...you won't be far out!!) Whereas 2 strokes always seem to be reving hard & making a lot of fuss a 4 stroke just gets on with the job..... Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted September 5, 2009 Share Posted September 5, 2009 Bit like my "Ruperts Dad " 60" span -Thick wing section-Looks a bit like a Druine Turbulent designed for a 52 'ish 4 stroke 'cos the designer Roger Groves was told that a 4 stroker wouldn't have enough whoomphh to power a 3-D job . Brilliant machine & on low rates is probably the best 2nd trainer around (ailerons) With a fine pitch prop it gets a bit noisier but will do absolutely anything & can be "braked" in a dive .The choice is yours . It's either a 12 X 6 or a12.5 X 3 3/4. Work that one out 'lecktrikly wise ! G-umpy 1 Quote Link to comment Share on other sites More sharing options...
Bladerunner Posted September 19, 2009 Share Posted September 19, 2009 Posted by Phil B on 04/09/2009 21:32:03:Is the only advantage of a four stroke motor the sound it makes. Or I am i missing something. ( i suspect I am)One big advantage of 4 cycle is that they respond quite linearly to throttle input - relative to small 2 cycles which tend to be a bit "peaky". Quote Link to comment Share on other sites More sharing options...
andy watson Posted September 19, 2009 Share Posted September 19, 2009 But for all that the main advantage is the beautiful noise they make. I have 2 brand new 2 strokes- a 57 and a 75 and I am really struggling to think what I might put them in, since I will probably only ever want a 4 stroke in a plane. Quote Link to comment Share on other sites More sharing options...
Bruce Richards Posted September 20, 2009 Share Posted September 20, 2009 Andy, Put them in a parcel and send then to me. Quote Link to comment Share on other sites More sharing options...
andy watson Posted September 20, 2009 Share Posted September 20, 2009 No problem, send me your address written on the back of couple of nice 4 strokes Quote Link to comment Share on other sites More sharing options...
Bruce Richards Posted September 20, 2009 Share Posted September 20, 2009 Sorry I have no spare strokes my 2 cats need them all. Quote Link to comment Share on other sites More sharing options...
Former Member Posted September 23, 2009 Share Posted September 23, 2009 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Former Member Posted September 23, 2009 Share Posted September 23, 2009 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Ernie Posted September 23, 2009 Share Posted September 23, 2009 they are just gems of minature engineering ernie Quote Link to comment Share on other sites More sharing options...
Olly Giles Posted September 23, 2009 Share Posted September 23, 2009 Posted by Martin Harris on 04/09/2009 21:43:21:Also more fuel efficient and more acceptable sound to the neighbours, assuming you were referring to the slightly more realistic sound of a 4 stroke. I wouldnt say that they were more efficent. The smaller 52 size drink arund the same as a 46 2s but the bigger they go the more they drink. I have a YS110 that drinks 580cc in 13mins! A 90 2s would be more efficent but there is nowhere near the tourqe. If i was to make a bold statement i would say that 4 cycles are better than 2! Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted September 24, 2009 Share Posted September 24, 2009 Oliver, You're not really comparing with an average 4 stroke here. The YS is effectively fuel injected and typically runs on 25% nitro. As you're no doubt aware, the nitro-methane "bulks out" the fuel, increasing the brake mean effective pressure - the effects being that the fuel is used much more quickly than the typical 0 - 10% nitro used by Laser, Enya, OS and clone 4 strokes etc. and of course, the YS is much more powerful capacity for capacity.I would also take issue with your statement that a 52 4 stroke uses fuel at the same rate as a 46 2 stroke - all I can say is that in my experience none of my various OS and SC 52s use fuel at anywhere near the rate my OS or Irvine 46s. By their very nature, 4 strokes are able to fill their cylinders better and burn more of the fuel passing through the engine. Compare the temperature of their exhaust gas! Tuned pipes will improve 2 stroke efficiency of course. Against 4 strokes is their extra weight and complication I would always go for a 4 stroke in scale models and love their sound. If I could justify the initial and running costs of a YS I'd love one and agree that they produce a terrific amount of power for their capacity. However, I also love the OS90 2 stroke in my Panic but I'm with you in that my natural preference is for 4 strokes!Edited By Martin Harris on 24/09/2009 09:50:28 Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted September 24, 2009 Share Posted September 24, 2009 ...just realised a couple of words went AWOL - I meant to write that YSs are "effectively supercharged and fuel injected". (They use crankcase pressure to push air into the cylinder). Quote Link to comment Share on other sites More sharing options...
Boots Posted September 29, 2009 Share Posted September 29, 2009 A powerful 2 stoke is much cheaper to produce than a powerful 4 stroke for a given cc. using pushrods, tappets and valve springs severely limits the peak rpmchain or belt driven overhead cam would be better but still lacking in peak rpmneed to use the system where the valve has a twin fork arrangement on the cam shaft to open and close it, no valve spring at all , so delaying valve bounce to a much higher rpm , problem with going hitec is the engine may well have to be water cooled so the temperature can be finely regulatedpoint is would you pay a few grand for a 60 ?dont know the ys 110, what is it, turbo or super charging certainly seems to be a cheap way of getting around the problem Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted September 29, 2009 Share Posted September 29, 2009 Well.....an OS26 fourstoke buggy motor will regularly hit 26,000 rpm.....250cc motorbike engines are often 4cylinder 4 stokes (62.5cc per cylinder) & they redline at 19-20,000 rpm.......how fast do you want to go??? 2 strokes are generally more powerful than 4 stokes because you get twice the bangs....ie in any given time frame at the same rpm a 2 stroke will have twice as many power stokes as a 4 stroke....yes the combustion in a 4 stroke is more efficient etc but for power vs weight/complexity an air-cooled 2 stoke is hard to beat....that's why we use 'em!!! Quote Link to comment Share on other sites More sharing options...
Former Member Posted September 29, 2009 Share Posted September 29, 2009 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted September 29, 2009 Share Posted September 29, 2009 David beat me to it.... please avoid inflammatory remarks and assumptions people Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted September 29, 2009 Share Posted September 29, 2009 Well, thank you David & Timbo...... I wasn't going to dignify Jasons remarks with a response but if he would like to click here he might learn something...... Quote Link to comment Share on other sites More sharing options...
Former Member Posted September 29, 2009 Share Posted September 29, 2009 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
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