Ganbatte Posted September 22, 2020 Author Share Posted September 22, 2020 So that brings to mind a thought: I've found that writing vendors, magazines whatever, esp in a small market like this often triggers results. So is there any person or organization we-all can think of who might be nudged to test (with instrumentation, hopefully) vitto vs skymax exhausts? Quote Link to comment Share on other sites More sharing options...
Blackburn Mark Posted September 22, 2020 Share Posted September 22, 2020 On 21/06/2020 at 20:23, nicosangeli said: I’ve got bikes with ti exhausts with no problems ... It would seem Vitto and Skymax (or any manufacturer) are surfing a very thin line between weight and self-destruction... Bikes have rigid frames, lots of mass and space to damp out firing pulses between the motor and exhaust so can take a slightly more long lasting rigid approach in regards to seals and fatigue. A paramotor is very light and its exhaust wraps around the cranks center of moment so its firing pulses are easily transmitted in the worst possible way, directly into the exhaust's mass. Go floppy, the seals self destruct, go rigid, the exhaust body fatigues... fail to maintain the floppy joints (by replacing the seals often) the exhaust body fatigues... over-tighten the floppy joints.... etc. etc. Quote Link to comment Share on other sites More sharing options...
Ganbatte Posted September 22, 2020 Author Share Posted September 22, 2020 Well there's that; anything mechanical with weight constraints will require first design attention, then empirical, iterative test-and-refine cycles. Which we expect to be performed by the manufacturers, rather than the users. But when they fail at the same spot over and over, that tells us that spot needs to be beefed up. When failures are randomly distributed over several points, we can conclude the design is mature. Quote Link to comment Share on other sites More sharing options...
Blackburn Mark Posted September 22, 2020 Share Posted September 22, 2020 1 hour ago, Ganbatte said: first design attention, then empirical, iterative test-and-refine cycles. Don't let us hold you back 1 Quote Link to comment Share on other sites More sharing options...
Ganbatte Posted September 22, 2020 Author Share Posted September 22, 2020 lol! I'm too lazy to get into the vitto exhaust business; just wanna buy one good/light one. Quote Link to comment Share on other sites More sharing options...
Ganbatte Posted September 23, 2020 Author Share Posted September 23, 2020 ... and hoping the skymax qualifies. But not willing to let hope overwhelm data. If I can find some data. Quote Link to comment Share on other sites More sharing options...
Bob27 Posted September 23, 2020 Share Posted September 23, 2020 I ran across a potential paramotor new exhaust joint design(see the linked image). It is capable of bending in any direction, it can be slightly compressed and stretched, it eliminates the need for any springs or bushings that can go bad and overall it could simplify the exhaust design. My only concern is that this design may weaken the shockwave from the engine even more than our current design, but I lack a degree in aerodynamics to fully assess it. Believe that the primary goal would be to get rid of the bushings that many exhausts need replaced 100 or so hours along with the springs which can break or be lost. Also the ability for the joint to compress and stretch could help protect the tuned pipe even better from vibration and allow for a lighter exhaust. Quote Link to comment Share on other sites More sharing options...
Ganbatte Posted September 24, 2020 Author Share Posted September 24, 2020 Yes, that's an ancient coupler design (industrially), dunno why it's not used much. Maybe it fatigues fast? Quote Link to comment Share on other sites More sharing options...
Bob27 Posted September 24, 2020 Share Posted September 24, 2020 I wonder. My only thought is that of it is not made of the proper metal it could crack after a while or on a 2 stroke, the shockwave could baffled going through there like on a suppressor. Quote Link to comment Share on other sites More sharing options...
nicosangeli Posted October 8, 2020 Share Posted October 8, 2020 finally managed to fit the skymax exhaust...! simple procedure and quiter than original.. don't like the mounting bits they're using but seem to work fine.. C8924BF2-44BF-43FA-B803-17CB09BF55F8.heic Quote Link to comment Share on other sites More sharing options...
nicosangeli Posted October 8, 2020 Share Posted October 8, 2020 Quote Link to comment Share on other sites More sharing options...
Ganbatte Posted October 8, 2020 Author Share Posted October 8, 2020 Cool beans, and "quieter" is nice to see. Now go put 50 hours on it please. 1 Quote Link to comment Share on other sites More sharing options...
nicosangeli Posted October 8, 2020 Share Posted October 8, 2020 as soon as the temperature drops under 30deg i will...! Quote Link to comment Share on other sites More sharing options...
Bob27 Posted October 8, 2020 Share Posted October 8, 2020 I'm really hoping that there is a proper resonating camber within the exhaust. If not, you will loose a bit of power. Quote Link to comment Share on other sites More sharing options...
simonhunny Posted October 9, 2020 Share Posted October 9, 2020 11 hours ago, Bob27 said: I'm really hoping that there is a proper resonating camber within the exhaust. If not, you will loose a bit of power. the atom 80 exhaust seems to work very well, similar design to skymax moster exhaust Quote Link to comment Share on other sites More sharing options...
Ganbatte Posted October 9, 2020 Author Share Posted October 9, 2020 It does look a little clunky, but we don't know what's inside. I'm hoping for happy report, but will wait on the actual data, before I let hope overwhelm reason. And I'll happily take clunky if it comes along with 3.5 # weight saving. Quote Link to comment Share on other sites More sharing options...
Ganbatte Posted December 11, 2020 Author Share Posted December 11, 2020 Ok, it's been a while, and I've heard some chatter about how the skymax exhaust "blows up all the time". I don't know what "blows up" means (develops crack? explodes in flight? There's a bit of difference between the two). I don't know what "all the time" means, and I don't know if that's results of the version 1 or 2 or if there's any difference. So... Does anyone have any data to illuminate this issue? One poster mentioned he'd received one, any update there? Thanks in advance! Quote Link to comment Share on other sites More sharing options...
nicosangeli Posted December 11, 2020 Share Posted December 11, 2020 have approximately 5 hours on mine and no problems so far except some minor leaking from the joint ... very happy thus far ... Quote Link to comment Share on other sites More sharing options...
Ganbatte Posted December 12, 2020 Author Share Posted December 12, 2020 New data: Not trying to cause trouble for anyone, but apparently I can't buy the skymax exhaust in the US, reason being "they all blow up". I don't know if the version 2 fixes (whatever) problem, but the situation is what it is. I'll remain interested in hearing any new data people have experienced directly. Quote Link to comment Share on other sites More sharing options...
nicosangeli Posted December 12, 2020 Share Posted December 12, 2020 who says so...? why don’t they share details...? Quote Link to comment Share on other sites More sharing options...
Ganbatte Posted December 12, 2020 Author Share Posted December 12, 2020 I don't want to get anyone n trouble w skymax, but I'm hoping the exhaust is reliable. Waiting on hard data. Quote Link to comment Share on other sites More sharing options...
nicosangeli Posted December 13, 2020 Share Posted December 13, 2020 when i contacted them before getting mine,they said they had problems with the first design... they told me they will put them in production when they were ready. later the improved version was available which does look totally different came out and that’s the one i got... Quote Link to comment Share on other sites More sharing options...
Ganbatte Posted December 13, 2020 Author Share Posted December 13, 2020 The new one looks different? Huh, I've been told the v2 looks identical to v1. Maybe yours is an (undeclared) v2.5? I do wish mfrs would be more transparent, but then I wish the Great Pumpkin were real. Can you post a pic of your new one? Quote Link to comment Share on other sites More sharing options...
nicosangeli Posted December 13, 2020 Share Posted December 13, 2020 it’s the one in the video with the joint..! the first one didnt have a joint Quote Link to comment Share on other sites More sharing options...
Ganbatte Posted December 13, 2020 Author Share Posted December 13, 2020 2 hours ago, nicosangeli said: the first one didnt have a joint Ah, I didn't realize v1 didn't have that. TY Quote Link to comment Share on other sites More sharing options...
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