Popularity Problem

[Ken Watson]

That exhaust is identical to mine externally, but what about your internals? ken

[Mark Horan]

Ken, you will probably find that the baffles are CLT!

[Ken Watson]

The Mayor of Braidwood, the right honourable Marcus Horan has spoken. We can be as loud as we want as long as we keep the noise down.Do you stir the other councillers up, because if you do you are doing a good job. Any noise from the turbo yet. I've heard they are real quiet. The Mayor of Berry, Ken.

[Brian]

Good looking muffler Paul, I particularly like the flexible bits. What baffling do they have, whats the price how heavy are they and how quiet are they?????BrianPooncarie NSW

[asra]

quote:Originally posted by BrianGood looking muffler Paul, I particularly like the flexible bits.That is the secret for the heating and cooling cracking What baffling do they have,enough!! [:][/b]D] whats the price Cheap enough!!! []how heavy are they light enough!! []and how quiet are theyquiet enough!! []????? BrianPooncarie NSW Sorry Brian, just being cheeky. They are quiet, I will try to remember to weigh one tomorrow as I have forgotten. Price, I can't remember so I will check it out. I supplied one to Larry Neal for hios first Golden Butterfly, but I have not heard what he thought.Aussie Paul.[]www.firebirdgyros.com

[Tim]

quote:Originally posted by Firebird PaulWe have not had any cracking problems on any of the machines these props have been fitted to, both here and overseas.Paul, sorry for taking so long to reply. What about your engine mount at Alice? And a previous posting where you related a story something about "a day you should not have gotten out of bed" - wasn't a cracked alternator bracket one of the problems there? Are you saying that a wide chord 2 blade prop had never been fitted to these gyros? There was also Scott Hogan's broken alternator bracket at Cooma. Perhaps we should float the question to other members to see how many have had similiar problems. I could relate many instances some years ago that caused us to give up using large 2 blade props for the same reason. quote:Tim, you said,The problem is, as I see it, the wide chord taking out a bigger slice of dirty air than a multi blade of narrower chord. Could you explain further please[?]A large percentage of the air entering the prop in a pusher gyroplane is dirty air - i.e. disturbed air that is striking the prop at many different angles, because of the interference from the different obstacles that it must pass. If you compare a 6" chord 2 blade with a 3" chord 4 blade, both have the same blade area but the 4 blade is striking half the air per blade as the 2 blade, = half the blade impact (vibration) from swiping the disturbed air. Props striking dirty air also translates to extra noise, and should the same prop be in a tractor configuration, you could probably chat to passengers without headsets and in a normal voice.Tim McClureBroken Hill

[Scott Hogan]

Hi All,Tim, I have just found that the same alternator mount has broken again. I have just replaced the broken rod end with a 5mm steel angle bracket.But before anyone says "I told you so", I have found an inherent misalignment problem that was not resolved, even at the Cooma National Titles.Having emailed Don, at RAF in Canada and received a response that was basically stating "The Bleedin' Obvious", and that is, that there should be no side loading whatsoever on the rod ends that support the alternator, I discovered that there was side loading of the rod ends which would eventually cause one of them to fail.So, I think the failure(s) should be put down to misalignment. Time would have told, except for the fact that I have just put a 3 blade 68" Warp Drive Prop in place of the 2 blade timber one, so we'll never know.I'm happy to say that my fuel economy and cruise speed has increased dramatically , although I have only flown for a few hours with this prop so far.Absolutely no doubt that the 2 blade timber prop is quieter than the Warp Drive, even when it is spinning at 300 RPM more at max revs.If it was pitch adjustable, it would be great. It is really setup as a climb prop, rather than for cruise. Great for training I reckon.That's my 2 bob's worth. Hoges

[Mark Horan]

Thanks for the message peteMark.

[Tim]

quote:Originally posted by Scott Hoganthat there should be no side loading whatsoever on the rod ends that support the alternator, As you say Scott, "often the bleeding obvious"You probably already know this, but for those that don't most alternators come in either a single wide lug mount or two mounting lugs approx 60mm apart. The single lug mountings have to be washer shimmed if they are not the correct snug fit into their bracket. The two lug versions have one fixed mounting hole and one with a sliding bush. The sliding bush should be gently tapped into position for a correct fit giving no side load when tensioned. Any bracket with a side bending load and then given a cause to vibrate will eventually crack. Alternators get a double dose with any out of balance of the engine/prop and the pulsing torque vibration from the crankshaft. The latest Nissan Navara 3.0lt engine have tried to partially eliminate this problem by having a sprag clutch built into the alternator pulley. I wouldn't mind betting that it would make the idle smoother on most gyro engines with re-drives also.Tim McClureBroken Hill

[asra]

quote:Originally posted by Scott HoganHi All,Tim, I have just found that the same alternator mount has broken again. I have just replaced the broken rod end with a 5mm steel angle bracket.But before anyone says "I told you so", I have found an inherent misalignment problem that was not resolved, even at the Cooma National Titles.Having emailed Don, at RAF in Canada and received a response that was basically stating "The Bleedin' Obvious", and that is, that there should be no side loading whatsoever on the rod ends that support the alternator, I discovered that there was side loading of the rod ends which would eventually cause one of them to fail.So, I think the failure(s) should be put down to misalignment. Time would have told, except for the fact that I have just put a 3 blade 68" Warp Drive Prop in place of the 2 blade timber one, so we'll never know.I'm happy to say that my fuel economy and cruise speed has increased dramatically , although I have only flown for a few hours with this prop so far.Absolutely no doubt that the 2 blade timber prop is quieter than the Warp Drive, even when it is spinning at 300 RPM more at max revs.If it was pitch adjustable, it would be great. It is really setup as a climb prop, rather than for cruise. Great for training I reckon.That's my 2 bob's worth. HogesScott, if I remember correctly that was set up as a climb prop. It revved a little higher than what I like to use.Most Rafs broke those rod ends that hold the alternator.Aussie Paul.[]www.firebirdgyros.com

[asra]

So what prop is louder ? the single blade wood prop or the multi blade prop ? one fella says the warpdrive 3 blade is definately louder , and another saysthats why ya switched to multiblades props a while back to reduce noise and vibration.... I'm confuzelated ! Bob......" Momm'a alwayse told me , Son the impossable is only a little bit Harder... and ya know I do believe She was RIGHT ! "

[asra]

quote:Originally posted by Timquote:Originally posted by Firebird PaulWe have not had any cracking problems on any of the machines these props have been fitted to, both here and overseas.Paul, sorry for taking so long to reply. What about your engine mount at Alice? And a previous posting where you related a story something about "a day you should not have gotten out of bed" - wasn't a cracked alternator bracket one of the problems there? Are you saying that a wide chord 2 blade prop had never been fitted to these gyros? There was also Scott Hogan's broken alternator bracket at Cooma. Perhaps we should float the question to other members to see how many have had similiar problems. I could relate many instances some years ago that caused us to give up using large 2 blade props for the same reason. quote:Tim, you said,The problem is, as I see it, the wide chord taking out a bigger slice of dirty air than a multi blade of narrower chord. Could you explain further please[?]A large percentage of the air entering the prop in a pusher gyroplane is dirty air - i.e. disturbed air that is striking the prop at many different angles, because of the interference from the different obstacles that it must pass. If you compare a 6" chord 2 blade with a 3" chord 4 blade, both have the same blade area but the 4 blade is striking half the air per blade as the 2 blade, = half the blade impact (vibration) from swiping the disturbed air. Props striking dirty air also translates to extra noise, and should the same prop be in a tractor configuration, you could probably chat to passengers without headsets and in a normal voice.Tim McClureBroken Hill

[asra]

quote:Originally posted by BrianGood looking muffler Paul, I particularly like the flexible bits. What baffling do they have, whats the price how heavy are they and how quiet are they?????BrianPooncarie NSWBrian, I have no idea of the baffling, they weigh 6 kg, and the price is $400.Aussie Paul.[]www.firebirdgyros.com

[Mark Horan]

Does that mean Paul,That you are baffled by what is inside the muffler?

[NiqueNaque]

Reowrrr.. phhht..Nicholas TomlinAlarmist - www.alarmist.com.au - we scare for you