Guest Posted September 8, 2013 Share Posted September 8, 2013 Quote Link to comment Share on other sites More sharing options...
AdEves Posted September 8, 2013 Share Posted September 8, 2013 I want to touch it, feel it, hear it and smell it. Quote Link to comment Share on other sites More sharing options...
Guest Posted September 8, 2013 Share Posted September 8, 2013 lol SW Quote Link to comment Share on other sites More sharing options...
pete_b Posted September 8, 2013 Share Posted September 8, 2013 If it has the reliability then I think the only thing it needs to be the number 1 power plant is Fuel injection (for economy and emissions). Twin ignition for safety (as most other aircraft) Pete Quote Link to comment Share on other sites More sharing options...
Christoffel Posted September 8, 2013 Share Posted September 8, 2013 finally ... 2 cyl, I've waiting so long for this type of engine. How many cc ? 15 kg for 30 HP is a good P/W ratio. and its a 2 cycle too ... lol .... Quote Link to comment Share on other sites More sharing options...
ptwizz Posted September 9, 2013 Share Posted September 9, 2013 So, what are the advantages of a 2 stroke twin over a similar displacement single? More weight per cc. More friction (2 little ends, 2 big ends, more piston circumference) per cc. Presumably a simultaneous firing boxer, so still fires every 360°. Potentailly better primary balance. I suspect much of the appeal is in just having a 2 cylinder engine. Multi cylinder engines in this size can produce more power than singles IF they are run very fast. If you want a screaming banshee with the associated peaky power and substantial reduction gear, then this is for you. That said, I have to admit that a 7 cylinder 4 stroke radial paramotor engine would have my attention. Quote Link to comment Share on other sites More sharing options...
s1buell_wl Posted September 9, 2013 Share Posted September 9, 2013 All things even, the single has more torque than a multi. Torque is what accelerates you. Add the less weight of a single vs a multi, the single is far quicker off the line than the multi (bike as an example) The multi has smaller pistons, less internal part weight, etc., and thus the multi can spin faster and thus can produce far more horsepower. Horsepower is what pushes you thru the air and the multi has far better top speed. In paramotoring I’m not sure…. Might be lighter, might spin up faster but with the lacking torque I’m not sure if that would be the case. Things that make you go hemmmmmm Could it be marketing at work here? Put me down for a 7cyl too! It will make my glider go faster hehehehehehehehe. Quote Link to comment Share on other sites More sharing options...
AdEves Posted September 9, 2013 Share Posted September 9, 2013 PT, do you think it's a true boxer? Doesn't look long enough in the crank for the extra journal.. If not it could vibrate more than a single. Quote Link to comment Share on other sites More sharing options...
s1buell_wl Posted September 9, 2013 Share Posted September 9, 2013 PT, do you think it's a true boxer? Doesn't look long enough in the crank for the extra journal.. If not it could vibrate more than a single. Interesting question.... never thought of that! If it has one journal per piston it will really be smooth. But really does not most of the vibration come from the prop? Quote Link to comment Share on other sites More sharing options...
AdEves Posted September 9, 2013 Share Posted September 9, 2013 No, from the reciprocating mass of the piston/conrod Quote Link to comment Share on other sites More sharing options...
Guest Posted September 9, 2013 Share Posted September 9, 2013 Prop only if out of balance. SW Quote Link to comment Share on other sites More sharing options...
s1buell_wl Posted September 9, 2013 Share Posted September 9, 2013 https://www.facebook.com/photo.php?v=65 ... =2&theater Quote Link to comment Share on other sites More sharing options...
mark_t Posted September 9, 2013 Share Posted September 9, 2013 finally ...2 cyl, I've waiting so long for this type of engine. How many cc ? 15 kg for 30 HP is a good P/W ratio. and its a 2 cycle too ... lol .... 160 cc mark Quote Link to comment Share on other sites More sharing options...
gordon_dunn Posted September 10, 2013 Share Posted September 10, 2013 Nice.. but almost weighs the same as my complete paramotor (frame, engine, harness, prop and engine....) Miniplane T80.... I don't think I'll be carrying this anywhere in a hurry.... GD Quote Link to comment Share on other sites More sharing options...
ptwizz Posted September 10, 2013 Share Posted September 10, 2013 A 2 stroke boxer cannot use a single throw crank. Induction is by displacement into the crankcase, if one piston was moving into the crankcase while the other was moving out, there would be no net displacement and therefore no induction. It doesn't need much extra length to fit the 2 throw crank in, the offeset between the cylinders need only be about twice the thickness of the coneecting rod. The power you can get from a high revving multi cylinder engine tends to be quite peaky. You won't get much power at all until you get into the high revs, then it will come on quite rapidly. Many of us will remember the RD250s and 350s of the Seventies; gutless up to 6000rpm and rocketship performance from 6000rpm until the inevitable bang. One of the nice features of the Bailey 4 stroke engine is the smooth, progressive power. Quote Link to comment Share on other sites More sharing options...
AdEves Posted September 10, 2013 Share Posted September 10, 2013 PT- good point, hadn't thought about it from a two stroke perspective, so it is a boxer. Looks bloody smooth in the vid. Quote Link to comment Share on other sites More sharing options...
s1buell_wl Posted September 10, 2013 Share Posted September 10, 2013 RD250s and 350s Remember the RD500 V4? Man I ton of people are 6 feet under due to this unit (Race unit any teen with money could buy) I remember the RD well... Anyone that was riding in 1st-2nd-3rd gear and past the 6k only needed to let off and quickly twist the throttle back to full. This would result in the rider on their back in traffic or worst on their back in the meat wagon. Crazy bike. Yea your right single throw is only in 4 strokes right. So from what I read its a 160cc engine. So not matter what the engine should/will have more then enough bottom end for a paramoter (crazy topend). also it seems to be targeted for the race applications (makes sense). I'm also guessing it will cost around 6k+ just for the motor With this engine the race guys will be able to fly a 14m-16m wing lol Sexy it is! Quote Link to comment Share on other sites More sharing options...
outkast Posted September 10, 2013 Share Posted September 10, 2013 RD250s and 350sRemember the RD500 V4? Man I ton of people are 6 feet under due to this unit (Race unit any teen with money could buy) I remember the RD well... Anyone that was riding in 1st-2nd-3rd gear and past the 6k only needed to let off and quickly twist the throttle back to full. This would result in the rider on their back in traffic or worst on their back in the meat wagon. Crazy bike. Yea your right single throw is only in 4 strokes right. So from what I read its a 160cc engine. So not matter what the engine should/will have more then enough bottom end for a paramoter (crazy topend). also it seems to be targeted for the race applications (makes sense). I'm also guessing it will cost around 6k+ just for the motor With this engine the race guys will be able to fly a 14m-16m wing lol Sexy it is! Paul Bailey has said the new hornet paramotor will be around the same price as a V5. Quote Link to comment Share on other sites More sharing options...
tortoise332 Posted September 10, 2013 Share Posted September 10, 2013 Hi all The rds had a power valve system Ypvs when opened at 5500 rpm A Rocket ship Cheers gary Quote Link to comment Share on other sites More sharing options...
Guest Posted September 11, 2013 Share Posted September 11, 2013 Exactly like the EXUP valve on the 1000cc's (one of which I am getting delivered today!!!! -) ) SW Quote Link to comment Share on other sites More sharing options...
ptwizz Posted September 11, 2013 Share Posted September 11, 2013 YPVS and EXUP are different animals. EXUP simply opens a valve to reduce the restriction of the exhaust system of a four stroke engine at high RPM, above that at which noise testing is carried out. YPVS is variable valve timing applied to a 2 stroke engine. I believe the principle was established in the 1920s on split singles with movable cylinder liners. Quote Link to comment Share on other sites More sharing options...
Guest Posted September 11, 2013 Share Posted September 11, 2013 ??? I had a YPVS, its a slide that opens and closes at the outlet ports. The exup valve is similar but further into the exhaust. Just been for an awesome blat on it as it happens :-) SW Quote Link to comment Share on other sites More sharing options...
ptwizz Posted September 11, 2013 Share Posted September 11, 2013 The YPVS valve was, as I remember it, a rotating drum with a cutaway which formed the upper edge of the exhaust port in the cylinder. Rotating the drum altered the point at which the exhaust opened and closed, permitting the engine to make more effective use of the tuned pipe scavenging over a wider range of RPM. Edit: There was a sliding version of the YPVS valve in the TZR engines. Getting back to the original post, if Paul Bailey can supply this for the same price as a V5 motor, he will have a long queue of 2 stroke enthusiasts (i.e. perverts ) at his door. Quote Link to comment Share on other sites More sharing options...
outkast Posted September 11, 2013 Share Posted September 11, 2013 Price £5600 Quote Link to comment Share on other sites More sharing options...
s1buell_wl Posted September 11, 2013 Share Posted September 11, 2013 5600 = 8847.44US Ouch! I originally thought 6k US. I stand corrected. Why is sexy in everything so f'n expensive lol I'm not in the line! Quote Link to comment Share on other sites More sharing options...
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