Kolb-List Digest Archive

Sat 07/04/09


Total Messages Posted: 14



Today's Message Index:
----------------------
 
     1. 06:37 AM - Re: Re: New alternate engine on my MKIII (frank.goodnight)
     2. 07:28 AM - Re: New alternate engine on my MKIII (lucien)
     3. 07:42 AM - Re: Deviation cards (pj.ladd)
     4. 10:26 AM - FireWorks (possums)
     5. 10:43 AM - Lexan windshield question (Rex Rodebush)
     6. 10:51 AM - Re: New alternate engine on my MKIII (dalewhelan)
     7. 11:10 AM - Re: FireWorks (Jim Kmet)
     8. 11:24 AM - Re: Lexan windshield question (robert bean)
     9. 12:31 PM - Re: FireWorks (possums)
    10. 01:24 PM - Re: Lexan windshield question (Mike Welch)
    11. 03:33 PM - Re: FireWorks (Richard Girard)
    12. 05:27 PM - Re: FireWorks (russ kinne)
    13. 06:58 PM - Re: Lexan windshield question (John Bickham)
    14. 08:08 PM - Re: New alternate engine on my MKIII (dalewhelan)
 
 
 


Message 1


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    Time: 06:37:10 AM PST US
    From: "frank.goodnight" <frank.goodnight@att.net>
    Subject: Re: New alternate engine on my MKIII
    Hi, Re RPM- Seems like I remember from some school I attended a long time ago , that RPM doesn't have much to do with engine life . Piston speed is what counts. Short stroke and high Rpm equal a certin piston speed and a longer stroke and lower Rpm can equal the same piston speed.As long as the engine is balanced and the parts are built to take the stress of the piston starting and stopping- No problem. Of course the valve train is there to be worried about. I'm not trying to present the above as a fact, Only thats what I was taught I don't even remember what school I was in, some navy school I think. But it made sense the way it was explaned to me. Frank Goodnight FireStar 4 stroke On Jul 3, 2009, at 8:07 PM, JetPilot wrote: > > I doubt the engine would last long at 7000 RPM. On a snowmobile, > they use full throttle in short bursts, very little time is actually > spent at 7000 RPM. Think about it, a 120 HP snowmobile would be up > to over 100 MPH in about 5 seconds at full throttle, most time is > spent at far less RPM and power. That being said, maybe the Yamaha > engine would last a long time if it were limited to 100 HP and maybe > 5500 RPM on a Kolb. One other thing I really like about this > conversion is the Rotax Gearbox, that should solve a lot of > potential problems right there. This sounds like a very interesting > alternative engine, I hope it works out ! Please keep the > information coming, a lot of people will be interested in how this > engine works for you. > > Mike > > -------- > &quot;NO FEAR&quot; - If you have no fear you did not go as fast as > you could have !!! > > Kolb MK-III Xtra, 912-S > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=251391#251391 > >


    Message 2


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    Time: 07:28:55 AM PST US
    Subject: Re: New alternate engine on my MKIII
    From: "lucien" <lstavenhagen@hotmail.com>
    frank.goodnight(at)att.ne wrote: > Hi, > > Re RPM- Seems like I remember from some school I attended a long > time ago , that RPM > doesn't have much to do with engine life . Piston speed is what > counts. Short stroke and > high Rpm equal a certin piston speed and a longer stroke and lower Rpm > can equal the > same piston speed.As long as the engine is balanced and the parts are > built to take the > stress of the piston starting and stopping- No problem. Of course the > valve train is there > to be worried about. > > I'm not trying to present the above as a fact, Only thats what I > was taught I don't even > remember what school I was in, some navy school I think. But it made > sense the way it was explaned to me. > > Frank Goodnight > FireStar 4 stroke > On Jul 3, 2009, at 8:07 PM, JetPilot wrote: > > It's probably more how hard you work a lump of metal of a given size. In a very general way, the more power you try to extract out of an engine, the lower it's reliability and/or TBO. This is just a simple function of the extra stresses you impose on it as the power output goes up. More stress put on the bearings, rods, more sideloads on the piston against the cylinder walls, etc. I.e. the 912 series are so reliable because they're generally not nearly as suped up as they could be in other applications. Even tho they spin at 5000 to 5500 on a continuous basis, they can go all the way out to TBO at those rpms because they're "only" producing 80 to 90bhp. Same with the rotax 2-strokes. The original sno-mo 503 that the current 503 was based on was, IIRC, rated at 75bhp. The 582 was derived from an engine that put out nearly 100bhp (this is all from old memory so I'm hoping I'm remembering this right). The current a/c motors, of course are significantly detuned over the old engines (mainly due to the exhaust used) and are even beefier in the bottom end. That's partly why they work in a continuous-duty environment. As for conversions, you can actually get a good bit of continuous-duty reliability out of them by simply running them less hard than they're capable of assuming you still have a good power to weight at the lower power settings. I.e. the mazda rotary conversions are becoming pretty successful because they're tough as stink to begin with but can also still produce good power/weight ratios at power settings they can run for a long time at. That's all putting aside the installation issues, of course. In fact, the main killer of auto conversions is insurance, not the engines themselves. The insurance companies are more powerful than FAA when it comes to the rules of flight we have to fly under; auto conversions that don't have some person or business behind them that they can dishonorably sue generally can't get affordable insurance coverage if they can get it at all. LS -------- LS Titan II SS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=251447#251447


    Message 3


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    Time: 07:42:30 AM PST US
    From: "pj.ladd" <pj.ladd@btinternet.com>
    Subject: Re: Deviation cards
    My FAA Designee was not interested in my compass card,>> Hi John, I have never seen a microlight in the UK with a decent compass let alone a deviation card. Most have a stick on car compass which may be good to the nearest 5 degrees. I dont think most light aircraft pilots can fly within 3 degrees anyway and in a very light a/c like ours it is even more difficult. Difficult, but not impossible to get lost here in the UK. You just lose height and read the pub signs. Most pilots know every pub within 50 miles. I have a mate who is a raiIway buff and he will suddenly point and say "Look at that. That straight hedge is where the old line from Bratchester to Oxbridge used to run.The line was taken up in 1956 but that town over there must be....etc..All knowledge is useful. Cheers Pat


    Message 4


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    Time: 10:26:09 AM PST US
    From: possums <possums@bellsouth.net>
    Subject: FireWorks
    Anyone ever see a fireworks display from the air? (Flak don't count in this case). Thinking about flying up the road to tonight/afternoon if it starts early enough. It's at the horse track west of our field we sometimes fly around. Should make some good pictures from the air? "One-of-a-kind Fourth of July celebration, with integrated, simultaneous fireworks, show horses, pony rides and RC planes all in a rural setting. If you're planning to attend we will start early, and don't be in a hurry to leave as it can take an hour or more to clear roadways after the show. This huge low-level show, which you're not going to see in a big city skyline, can be much more up close and impressive." http://www.atlantasteeplechase.org/


    Message 5


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    Time: 10:43:44 AM PST US
    Subject: Lexan windshield question
    From: "Rex Rodebush" <rrodebush@tema.net>
    I'm fitting up the windshield. Do I just push it down and attach along the sides? I can do this but it takes a fair amount of pressure. Does anyone use heat to reduce the tension? Thanks, Rex Rodebush Mark III X-tra Read this topic online here: http://forums.matronics.com/viewtopic.php?p=251478#251478


    Message 6


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    Time: 10:51:59 AM PST US
    Subject: Re: New alternate engine on my MKIII
    From: "dalewhelan" <dalewhelan@earthlink.net>
    Some things about the Yamaha motor It is loosely related to a Yamaha R-1, very loosely. I have seen a few of those in street trim loose connecting rods. I have ridden people around race track at speeds of 160MPH with no problems. The snow mobile motor chosen here is lower RPM that an R-1 or RX-1 snow mobile motor. The area I would be worried about is the fact that the motor has a cam chain and a tensioner for that chain that I have often seen go bad. Many automatic cam chain tensioners fail, I regularly replace them with APE manual tensioners. The valve train is a shim and bucket design, I expect you will never wear out the valve guides. You may contact Dyno-Jet for carb tuning components, my experience has been that you can usually get the motors to run well with th components provided. I you follow the directions exactly, you will have some tuning to do. Apologies to the engineers that designed the kits. I have also found that most often fuel economy is noticeably reduced, throttle response is better, top end power is similar, mid range power is sometimes increased, some times the only difference is throttle response. Just for the record, I used to teach Yamaha snowmobiles, 2 and 4 stroke motor performance tuning and Dyno Jet operation. The factors I look at for a motors life are BMEP, Crank, rods, pins, bearings, cases, cylinder head hold down. Piston speed, Piston, rings Piston acceleration, ring flutter RPM valve train wear >From what math I have done the people at Yamaha build good stuff. The piston speeds are higher than what used to be thought possible. Yamaha has built motors the end up in show rooms with piston speeds in the area of 4,500 feet per minute. I am suspect of the 1000 4 cylinder and the 500 twin, I think the triple is the best choice of those motors and am very interested in how it works for you. I kinda like the idea of Jet ski motors, the piston to cylinder clearance is Too high, but the jet pumps only work to about 6,000 RPM so the 2 stroke motors are tuned for that speed, a good match for the 2.58 Rotax gear box and the prop I use. The four stroke boat motors are gear reduced. The carbs or fuel injection system are far less effected by negative Gs if you ever got an aerobatic inclination. -------- Dale Whelan 503 powered Firestar II Projection, A simple and interesting Psychological concept Read this topic online here: http://forums.matronics.com/viewtopic.php?p=251479#251479


    Message 7


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    Time: 11:10:41 AM PST US
    From: "Jim Kmet" <jlsk1@frontiernet.net>
    Subject: Re: FireWorks
    2 Years ago, I took my wife & 2 daughters in a C-182 up at dark & circled slowly while the town`s fireworks display went on for twenty minutes. They still tell all their friends about how cool it was. I recommend to anyone, if you get the chance, do it! Jim Kmet MK-3C Cookeville, TN ----- Original Message ----- From: "possums" <possums@bellsouth.net> Sent: Saturday, July 04, 2009 12:26 PM Subject: Kolb-List: FireWorks > > Anyone ever see a fireworks display from the air? (Flak don't count in > this case). > Thinking about flying up the road to tonight/afternoon if it > starts early enough. It's at the horse track west of our field we > sometimes > fly around. Should make some good pictures from the air? > > > "One-of-a-kind Fourth of July celebration, with integrated, simultaneous > fireworks, show horses, pony rides and RC planes all in a rural setting. > If you're planning to attend we will start early, and don't be > in a hurry to leave as it can take an hour or more to clear roadways > after the show. This huge low-level show, which you're not going to see > in a big city skyline, can be much more up close and impressive." > > http://www.atlantasteeplechase.org/ > > >


    Message 8


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    Time: 11:24:53 AM PST US
    From: robert bean <slyck@frontiernet.net>
    Subject: Re: Lexan windshield question
    My windshield is non standard but... Do one side first, (should be zero resistance) then push it down to the other side and clamp it before drilling. BB On 4, Jul 2009, at 1:42 PM, Rex Rodebush wrote: > > I'm fitting up the windshield. Do I just push it down and attach > along the sides? I can do this but it takes a fair amount of > pressure. Does anyone use heat to reduce the tension? > > Thanks, > > Rex Rodebush > Mark III X-tra > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=251478#251478 > >


    Message 9


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    Time: 12:31:59 PM PST US
    From: possums <possums@bellsouth.net>
    Subject: Re: FireWorks
    At 02:09 PM 7/4/2009, you wrote: > >2 Years ago, I took my wife & 2 daughters in a C-182 up at dark & >circled slowly while the town`s fireworks display went on for twenty >minutes. They still tell all their friends about how cool it was. I >recommend to anyone, if you get the chance, do it! >Jim Kmet That settles it then, what could possible go wrong.


    Message 10


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    Time: 01:24:03 PM PST US
    From: Mike Welch <mdnanwelch7@hotmail.com>
    Subject: Lexan windshield question
    Hi Rex=2C Bob's right about attaching one side first (with clecos). Then=2C bend t he windshield in place=2C and drill the opposite side. Do NOT use any heat !! The Lexan is so tough=2C I doubt you could break it by bending it. A couple pointers=3B When attaching my Lexan=2C after fastening the first side with clecos=2C I noticed the opposite side post wanted to deform from it's normal position when trying to bend the Lexan in place=2C and secure it with clamps. My s olution was to secure a couple of temporary cross braces between the posts =2C thereby helping to insure the installation of the Lexan didn't distort the side posts when clamping it in place. I decided to predrill the side posts before attaching the Lexan. It is v ery easy to see the underlying hole in the post=2C and then drill each Lexa n hole=2C cleco-ing as you go. Since the Lexan hole is supposed to be over sized anyway=2C there isn't much of a problem if you are off a little with your Lexan holes. Mike Welch MkIII turbo GEO > Subject: Kolb-List: Lexan windshield question > From: rrodebush@tema.net > Date: Sat=2C 4 Jul 2009 10:42:44 -0700 > To: kolb-list@matronics.com > > > I'm fitting up the windshield. Do I just push it down and attach along th e sides? I can do this but it takes a fair amount of pressure. Does anyone use heat to reduce the tension? > > Thanks=2C > > Rex Rodebush > Mark III X-tra > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=251478#251478 > > > > > > > =========== =========== =========== =========== > > > _________________________________________________________________ Hotmail=AE has ever-growing storage! Don=92t worry about storage limits. http://windowslive.com/Tutorial/Hotmail/Storage?ocid=TXT_TAGLM_WL_HM_Tuto rial_Storage_062009


    Message 11


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    Time: 03:33:50 PM PST US
    Subject: Re: FireWorks
    From: Richard Girard <aslsa.rng@gmail.com>
    When I was in high school many years ago I worked as a line boy for a flying club at KFUL. One of the members took his out of town in laws up to see the lights of the city and just happened to be over Disneyland at 9:00 pm. When the fireworks show started one of those big shells went off right under his right wing. Next day there was a notice on the bulletin board warning all the other pilots to "Watch out for flak over Disneyland". Rick do not archive On Sat, Jul 4, 2009 at 2:28 PM, possums <possums@bellsouth.net> wrote: > > At 02:09 PM 7/4/2009, you wrote: > >> >> 2 Years ago, I took my wife & 2 daughters in a C-182 up at dark & circled >> slowly while the town`s fireworks display went on for twenty minutes. They >> still tell all their friends about how cool it was. I recommend to anyone, >> if you get the chance, do it! >> Jim Kmet >> > > > That settles it then, what could possible go wrong. > >


    Message 12


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    Time: 05:27:31 PM PST US
    From: russ kinne <russ@rkiphoto.com>
    Subject: Re: FireWorks
    Dare I say "out of town in-laws" are better than "in-town outlaws???" On Jul 4, 2009, at 6:32 PM, Richard Girard wrote: > When I was in high school many years ago I worked as a line boy for > a flying club at KFUL. One of the members took his out of town in > laws up to see the lights of the city and just happened to be over > Disneyland at 9:00 pm. When the fireworks show started one of those > big shells went off right under his right wing. Next day there was > a notice on the bulletin board warning all the other pilots to > "Watch out for flak over Disneyland". > > Rick > do not archive > > On Sat, Jul 4, 2009 at 2:28 PM, possums <possums@bellsouth.net> wrote: > > At 02:09 PM 7/4/2009, you wrote: > > 2 Years ago, I took my wife & 2 daughters in a C-182 up at dark & > circled slowly while the town`s fireworks display went on for > twenty minutes. They still tell all their friends about how cool > it was. I recommend to anyone, if you get the chance, do it! > Jim Kmet > > > That settles it then, what could possible go wrong. > > ========== > arget="_blank">http://www.matronics.com/Navigator?Kolb-List > ========== > http://forums.matronics.com > ========== > le, List Admin. > ="_blank">http://www.matronics.com/contribution > ========== > >


    Message 13


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    Time: 06:58:06 PM PST US
    Subject: Re: Lexan windshield question
    From: "John Bickham" <gearbender@bellsouth.net>
    On my last lexan replacement I used the small ratcheting straps to pull the lexan down for drilling and clecoing. Of course, you need to use the appropriate padding to avoid scratches to lexan and damage to fabric. This helped with the problem that Mike W pointed out with a lot of pressure on clecos and clamps. Made the one man job a bit easier for me anyway. Next replacement gotta put clear tape under door hinges. Helps keep the water out when caught in those light rains on those XC flights. John H and John W trick! Wouldn't use heat but might do it in the sun! -------- Thanks too much, John Bickham Mark III-C w/ 912UL St. Francisville, LA I know many pilots and a few true aviators. There is a distinct difference that I have the greatest respect for. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=251532#251532


    Message 14


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    Time: 08:08:19 PM PST US
    Subject: Re: New alternate engine on my MKIII
    From: "dalewhelan" <dalewhelan@earthlink.net>
    Forgot to mention, valve wear has been an issue with many Yamaha 5 valve motors. Just check the clearance, if they start to tighten up you may want to replace the valves. They get tighter as they wear and will not make noise. If you need the valve seats cut I can do that for you. -------- Dale Whelan 503 powered Firestar II Projection, A simple and interesting Psychological concept Read this topic online here: http://forums.matronics.com/viewtopic.php?p=251540#251540




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