Robert where are you in Missouri On Dec 23, 2015 8:00 AM, "Robert7721 via KRnet" <krnet at list.krnet.org> wrote:
> Pierre, > > > Hate to say this, but I don't think this plane is going to be safe to fly > as is. If you are truly at 5500 ft, and empty weight is 876, the VW is > probably not going to be enough engine. Specially at the temperatures (89 > -108) you are stating. > > > Your 1st prop was closer to what you need. Steve Bennett at Great Plains > (VW Seller) basically said you need about 2900 rpm static to be sure you > were good. The RPM will climb up once you are in the air and moving. > > > I'm running a VW (Revmaster 2100D) and a 1500 ft roll to get 65 mph at > 5500 ft is actually good in my opinion. I know I used up quite a bit more > on a trip from the Midwest USA to California over some serious mountains in > 2014. There were a couple airports I landed/took off at with elevations > over 5500 ft. But my empty weight is closer to 650 pounds. My best climb > rate was maybe 300-400 ft/min at those elevations. I do normally get about > 800 fpm climb at my home airport in Missouri (1000 ft MSL). > > > Options, 1st I'd go back to the 1st Prop and Carb set up. That was close. > I believe someone else already commented that increasing the length to 54" > was a bad idea - that is correct. Normally, you shorten the prop to > increase RPMs. Lowering the pitch usually helps as well with increasing > the rpm, but length is a factor as well. > > > Also, > > > 1. Can you relocate to a lower elevation for initial testing? > 2. Wait for cooler weather? > > > > > Rob Schmitt > N1852Z > www.robert7721.com > > > > > -----Original Message----- > From: PIERRE via KRnet <krnet at list.krnet.org> > To: krnet <krnet at list.krnet.org> > Cc: PIERRE <pierre at d-toxdebt.co.za> > Sent: Wed, Dec 23, 2015 2:37 am > Subject: KR> VW + Prop > > Hi Guys, > > > > It feels as if I've hit a brick wall. I had a 48(pitch) X 52 prop on my > KR2S > (haven't flown yet). The max revs I got was 2,760rpm static. > > > > I then bought a 45(pitch) X 54 prop to see if I can get to 3,000rpm, but I > only got to 1,850rpm. Stripped the 2 Stromberg 175 cd carburetors and had > them rebuilt - no difference. The main problem with these numbers is that I > can only get to 65mph IAS and it takes 1,500 feet to get to that speed. The > main reason for wanting 3,000rpm is that the vw max torque is at 3,000rpm > and I think I will then jump to heigher rpm and thus more thrust and then > higher speeds...... What am I missing? > > > > The KR2S has got wing tanks and tri-cycle gear and is 4" wider in the > cabin, > weight is 876lbs empty, so she is a bit heavier that she should be. (I am > 176lbs and 5ft 8in) My altitude is 5,500feet ASL and the temps we had is > between 89 degrees and 108 degrees Fahrenheit. (32 degrees - 42 degrees > centigrade) > > > > Hope somebody can help! > > > > Cheers, > > Pierre > > _______________________________________________ > 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 > > _______________________________________________ > 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 >
