Hi Duncan, Thank you for your feedback. I was hoping for 100hp and it seems as this is where the heating problem starts to show up. I thought that weight and reliability wise it would be on par with the Corvairs, but it seems not to be so. And even the Corvairs are prone to crank failures as Mark experienced for himself.
TBO on the Rotax is only 350 hours, but then an overhaul is quick and easy and not overly costly. Guess I'll go with what I have. Believe me, I've had my share of Rotax failures, but these were without exception: 1. Fouled up plugs (my ow negligence - I now have dual ignition) 2. Broken v-belts (I now have a gearbox) After all the comments on the Subaru, good and bad, I trust the Rotax more. And 66hp (confirmed in the Pulsars) is not too bad for such a light engine. Kind regards, Henni -----Original Message----- From: KRnet [mailto:krnet-boun...@list.krnet.org] On Behalf Of EWMP via KRnet Sent: Thursday, 31 August 2017 12:53 PM To: Hendrik van Rooyen via KRnet <krnet@list.krnet.org> Cc: EWMP <woo...@xln.co.uk> Subject: Re: KR> Subaru EA81 Hi I have flown many hours behind an EA81 in a Jodel D18, G-WIBB. The engine is direct drive and probably only produces 45-50 HP in that configuration but it runs like a sewing machine and has covered around 450 hours without any major problems. The radiator is from an Austin Metro and the engine never overheats, regardless of how long you spend ground running or climbing. It is definitely heavier than a VW but it is totally reliable. Duncan On 31/08/2017 11:36, Hendrik van Rooyen via KRnet wrote: > Tx Mark, > > I have decided against the idea. You raised very valid points and I agree > totally. I'll stick to the Rotax 582 as I have many hours behind the type. > This Subaru offer appeared out of the blue and hence my initial > consideration. 100hp sounded so attractive, but not at the price that comes > with it (problems). > > Kind regards, > > Henni > > -----Original Message----- > From: KRnet [mailto:krnet-boun...@list.krnet.org] On Behalf Of Mark > Langford via KRnet > Sent: Thursday, 31 August 2017 12:31 PM > To: krnet@list.krnet.org > Cc: Mark Langford <m...@n56ml.com> > Subject: Re: KR> Subaru EA81 > > Henni wrote: > > >> What is your experience on the KR2 powered by the Subaru EA81 >> > converted to 100hp? > > I feel sure Steve Makish or Bob Lester will eventually comment, but they were > big fans of the Subaru and flew behind them for many hours. I believe > they'll tell you that the main crank bores in the case simply couldn't take > it and needed to be replaced more often than you'd expect. > They are also quite heavy, especially when you factor in the cooling system > and water. > > And as I've said quite often, I think it's a bad idea to use a water cooled > automotive engine in an airplane, unless it comes complete with the cooling > system assembled to the engine already (and none exist that way). The reason > is that YOU become the cooling engineer, and it's not as simple as it looks. > Contact! magazine is full of stories of various water cooled installations > boiling over on climbout on the the first flight. Imagine flying a plane on > its first flight, with a plan to go to altitude, determine IAS stall speed so > you'll have a clue of landing speed, getting used to how the plane flies and > responds to input, but you never get there. 300' off the ground it boils > over and blows steam all over the canopy, and the temp gauge is in the red. > You are completely screwed...you've got to get it on the ground before the > engine locks up, with zero experience as to how the plane flies, and now > you're pressed to do a very shortened landing with a quick u-turn thrown in > for good measure, and you can barely see where you're going! I've heard that > story too many times. It's too easy to create a place in the system where > steam gathers and prevents proper circulation of the coolant, and the > problems start. You'd think a proper ground runup vetting would show these > kinds of problems before they occur, but apparently not. I'm not saying all > installations are like this, but it's a failure mode that air-cooled engines > simply don't have. Both Steve and Bob swapped their Subarus for Corvairs, > and seemed very happy with them. > > Mark Langford > m...@n56ml.com > http://www.n56ml.com > > > _______________________________________________ > Search the KRnet Archives at > https://www.mail-archive.com/krnet@list.krnet.org/. > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options. > To UNsubscribe from KRnet, send a message to > krnet-le...@list.krnet.org > > _______________________________________________ > Search the KRnet Archives at > https://www.mail-archive.com/krnet@list.krnet.org/. > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options. > To UNsubscribe from KRnet, send a message to > krnet-le...@list.krnet.org > > _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
