When my Revmaster was built in the early 80's they recommended 40 weight, now they say 20/50.
Ken Wiltrout Kutztown, Pa ----- Original Message ----- From: <beverlyrai...@bellsouth.net> To: <kr...@mylist.net> Sent: Thursday, June 22, 2006 7:55 AM Subject: KR> oils and stuff > Phil mentioned running only straight 40W oil in his RG2000 by > recommendation. Just for the record I will say this is foolish and > potentially catastrophic. Straight weight oils went out of use by all > engine manufacturers including aircraft by the mid 1970's. > Multi-viscosity oils have been used and continually refined to being > better and better since that time. With such a superior oil protection > and ability in modern oils it doesn't make sense to use old technology. > The temp range of operation for straight weight oils is much more > restrictive than a similar weight multi. > > Most of us are running some version of an auto engine and so we need to > use the products that get the most life out of auto engines in hard or > severe use. My humble opinion... > > Some years ago I read an article in Plane and Pilot where they took a C > 182 (I think) and raised the horsepower from 230 hp to some 265. They > quoted some history on previous models with lower HP and then went on to > test the higher rated engine. They used a good old boy assumption that X > HP gave this much speed and raised to 230 gave this increase, so raising > HP this much to 265 would yield a constant rate of speed increase. It was > a practical exampl of proving the aerodynamic principle that if you double > the speed, your drag increases by 4 times. HP alone will not significantly > increase speed. Climb speed was increased dramatically. This is due to the > fact that climb is a reflection of any HP above what is required for level > flight is available for climb. So 35 extra HP means better climb > immediately at the same speed. But due to no decrease in drag, only a > nominal increase in speed was seen both at cruise and wide open throttle. > You can add an RG2000 or O 360 to a VP 2 and it will > climb great, but will not gain near as much in cruise speed due to the > design does not lend itself to low drag. > > For us KR drivers look at Trop Petteway's plane on Mark L's site, and > compare to anyone else's. He probably does not have much more HP than > Larry F, running the same family of engines, as was Marty Roberts. Yet he > was defintely faster as Mark L can atest. > > Colin > N96TA > > > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.394 / Virus Database: 268.9.2/373 - Release Date: 6/22/2006 > >
