Re: [AirVW] Digest Number 1029
I don't know if you're a member of theYahoo VP group, but Fritz Wagoner
fwagoner@... flies out of Las Cruces, NM. Which is close to the same altitude as Ogden, UT. Ask him for his advice on a prop
> Message: 2I don't know if you've joined th VP-1 group on yahoo yet or not, Fritz Wagoner
> Date: Mon, 01 Nov 2004 05:29:21 -0000
> From: "Jerry" <chlrsn_j@...>
> Subject: Better Climb Needed
> I recently purchased VP N3270G from Danny McCormick in TX. The
> plane came with a 1600cc VW and a Heggy 53x33 prop. This
> combination worked great in the thick air of TX, but the air here is
> a little thinner, then add a few degrees of temp and DA quickly
> leaves climb in the "come on baby, you can do it range", so therein
> lies my dilemma. What do I do to get better climb performance?
> This winter I plan to rebuild the engine, but am somewhat undecided
> as to the size I want to build. I know that I won't gain speed at
> cruise but that is not what I am after any how. I want to go higher
> Right now I might get 200-300 feet per min and I max out at about
> 7000ft msl. Not so great when the average mountain in about 8000 to
> 9000 feet msl in my area.
> My field elevation is 5000' and at run up I get about 3000 rpm and
> with a good tail wind I might see 3300 max rpm at about 6000'
> It has a slick mag with real airplane spark plugs
> So, for about the same price I can build either an 1834 or a 1915.
> I would like to see about 3300 or soon run up and be able to see
> 3800 or so unloaded (in the air). I will not cruise at this rpm as
> the plane seems to be just fine around 3150 rpm and 3.2 gph going
> about 75 to 80 mph average ground speed.
> What do you guys think?
> Right now with winter just about here flying is not a problem and
> come next month it will be too cold to go flying, so I will be
> rebuilding the engine then, I just need to decide which size to go
> to. By the way I will not be adding a stoker crank, just cylinder
> and piston size and maybe larger valves (but only if it will help
> turn the big fan better).
> Jerry in UT
> VP1 Jerry,