KR> anyone using a redrive on small VW engine
VW auto users consider it the "wrong end," but the overwhelming number of aircraft that use the VW engine have done it this way, ever since the original Volksplane (which i think was the first VW powered plane). If you do it the other way, the bolt holes on the crankcase wind up on the "wrong end" for fastening it to a firewall, and you wind up with the fat end of the crankcase in front, where most planes try to be narrow. Great Plains sells a setup for mounting the engine this way, bit they STILL say you can only use a wood prop. Only with a redrive do they let you use any kind of prop you want. Mike Taglieri On Apr 28, 2015 2:35 AM, "Chris Prata via KRnet" wrote: > I believe the aerovee turbo uses the "wrong" end of the crank. > http://www.sonexaircraft.com/news/images/AeroVee_Turbo_5771.jpg > > > > > thats why people who drive the prop from the wrong end always use a > > force 1 bearing and only wood props at normally aspirated, derated rpm > > tune only. > > > ___ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options >
KR> anyone using a redrive on small VW engine
I believe the aerovee turbo uses the "wrong" end of the crank. http://www.sonexaircraft.com/news/images/AeroVee_Turbo_5771.jpg > thats why people who drive the prop from the wrong end always use a > force 1 bearing and only wood props at normally aspirated, derated rpm > tune only.
KR> anyone using a redrive on small VW engine
On Mon, Apr 27, 2015 at 5:47 PM, bjoenunley via KRnet wrote: > Building a belt driven psru seems doable. Has anyone here built one or plan > to build one? > > Joe > Florida > > "current available redrives for the vw seem to be heavy and/or > unreliable. most would find the engineering cost to optimise redrives" > > yes it is but you have to make compromises. if i have to use a belt i would use a standard weight flywheel from the flyhweel end and 1 inch shafts to and from the belt drives. even a couple v belts will do. i would prefer the newer toothed belt in oil and plain bearings myself. i would still prefer a properly designed geared redrive with a fully counterweighted cross plane crank. the gears and flywheel don't need to be as heavy and i can use a turbo. if you don't want the flywheel then its more difficult. you have to handle harmonics between the prop and the large positive and negative torque pulses from the crankshaft. if you take power from the crank nose then thats way too hard already. the belts will self destruct no matter how heavy you make them. same for chains. even the heaviest gears will not survive the chatter from the backlash between the prop and crankshaft torque pulses. people have tried various clutches, viscous drives, rubber balls etc. they all end up heavier. thats why people who drive the prop from the wrong end always use a force 1 bearing and only wood props at normally aspirated, derated rpm tune only.
KR> anyone using a redrive on small VW engine
My heartburn with PSRUs is the engine will be turning a lot faster and putting out more power at the higher RPM. The engine will not last nearly as long as if it were running at 3200 RPM wide open and under less stress from the power output. Also, there are lots of moving parts, and new points of failure that don't exist without them on the plane. Mark Langford ML at N56ML.com http://www.n56ml.com
KR> anyone using a redrive on small VW engine
On Mon, Apr 27, 2015 at 6:43 AM, Chris Prata via KRnet wrote: > I wondered about that too. A redrive has other benefits as well of a larger, > slower turning propeller. First, much stronger takeoff acceleration and also > climb. Quieter too. > Hopefully some good replies and examples will be forthcoming... > Hi, current available redrives for the vw seem to be heavy and/or unreliable. most would find the engineering cost to optimise redrives to be prohibitively expensive. this is primarily due to torsional vibration issues. the flat 4 flat crank engine has the most horrendous torque pulses imaginable. it takes a heavy flywheel to tame them and that turns turns off most builders.
KR> anyone using a redrive on small VW engine
Building a belt driven psru seems doable. ?Has anyone here built one or plan to build one? Joe Florida "current available redrives for the vw seem to be heavy and/or unreliable. most would find the engineering cost to optimise redrives" Sent from my Verizon Wireless 4G LTE smartphone
KR> anyone using a redrive on small VW engine
> > >I have found a 1776 cc VW engine real cheap. > >Marty Martin +++ The other "elephant in the room" question is what do you plan to use the engine on? If on a KR1, O.K., if on a KR2, marginal power, if on a KR2s, inadequate power. Cheap is not a good deal if you can't use it. Larry Flesner
KR> anyone using a redrive on small VW engine
Is that bearing a bolt-on? So (forgive my ignorance) a stock Type 1 engine can be most improved with a forged crank and that extra bearing thing? Any other key mods? The best VW engines to install in a KR come with > forged cranks and an additional bear area up front for the prop hub. > Revmaster and Great Planes are the best engines in my opinion. I have not > seen a lot of redrives or rear drives on these engines, but that does not > mean it can't be done. No - safety factor does not increase with redrive, it > is one more item that can break. Direct drives are very reliable. > > Rob Schmitt > N1852Z > Kansas City MO > www.robert7721.com > >
KR> anyone using a redrive on small VW engine
I wondered about that too. A redrive has other benefits as well of a larger, slower turning propeller. First, much stronger takeoff acceleration and also climb. Quieter too. Hopefully some good replies and examples will be forthcoming... > Date: Sat, 25 Apr 2015 17:32:53 -0700 > To: krnet at list.krnet.org > Subject: KR> anyone using a redrive on small VW engine > From: krnet at list.krnet.org > > I have always heard of crank shafts braking when used as direct drives. I > know that if you use a redrive there is a weight penalty. But does the > safety factor go up as well. > > I have found a 1776 cc VW engine real cheap. It is brand new and has been > pickled and sitting for about 8 years. The lady wants $250. With that in > mind, would the redrive be a good idea. I think I would like to buy the > engine if anyone can tell me of a redrive and their performance and safety. > > Thank you > > Marty Martin > ___ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options
KR> anyone using a redrive on small VW engine
The best way to explain may be to go directly to the Great Plains website and do a lot of reading. Lots to be learned there. Here's a link to one page with most items arranged alphabetically: http://www.greatplainsas.com/sceparts.html George On 4/26/2015 10:59 PM, Chris Prata via KRnet wrote: > Is that bearing a bolt-on? So (forgive my ignorance) a stock Type 1 engine > can be most improved with a forged crank and that extra bearing thing? Any > other key mods? > > The best VW engines to install in a KR come with >> forged cranks and an additional bear area up front for the prop hub. >> Revmaster and Great Planes are the best engines in my opinion. I have not >> seen a lot of redrives or rear drives on these engines, but that does not >> mean it can't be done. No - safety factor does not increase with redrive, it >> is one more item that can break. Direct drives are very reliable. >> >> Rob Schmitt >> N1852Z >> Kansas City MO >> www.robert7721.com >> >> > > ___ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com
KR> anyone using a redrive on small VW engine
Marty, What do you plan to use it on? Early crank breaks were due to cast cranks. Most conversions now have some version of the "Force One Hub", which may or may not be attributed to GAPSC. Your best bet here is to get the serial number of the engine and ask Joe Horvath at Revmaster and Marty Roberts at GPASC, if it is suitable and what it would take to get it air worthy, assuming that you plan to use it in an aircraft. See N64KR at <http://krbuilder.org/> http://KRBuilder.org - Then click on the pics 2015 KR Gathering - McMinnville, OR. September 3 - 6 -- See U There. Peoples Choice at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best KR at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best Interior at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best Paint at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best Firwwall Forward at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best Interior and Panel at 2008 - KR Gathering in Mt. Vernon, Il - MVN Daniel R. Heath - Lexington, SC -Original Message----- Subject: KR> anyone using a redrive on small VW engine I have always heard of crank shafts braking when used as direct drives. I know that if you use a redrive there is a weight penalty. But does the safety factor go up as well.
KR> anyone using a redrive on small VW engine
Add a Force One Bearing, Virg On 4/25/2015 8:32 PM, Marty Martin via KRnet wrote: > I have always heard of crank shafts braking when used as direct drives. I > know that if you use a redrive there is a weight penalty. But does the > safety factor go up as well. > > I have found a 1776 cc VW engine real cheap. It is brand new and has been > pickled and sitting for about 8 years. The lady wants $250. With that in > mind, would the redrive be a good idea. I think I would like to buy the > engine if anyone can tell me of a redrive and their performance and safety. > > Thank you > > Marty Martin > ___ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options >
KR> anyone using a redrive on small VW engine
I have always heard of crank shafts braking when used as direct drives. I know that if you use a redrive there is a weight penalty. But does the safety factor go up as well. I have found a 1776 cc VW engine real cheap. It is brand new and has been pickled and sitting for about 8 years. The lady wants $250. With that in mind, would the redrive be a good idea. I think I would like to buy the engine if anyone can tell me of a redrive and their performance and safety. Thank you Marty Martin
