Looking for climb #s

[bret]

I am still on the fence to go FP or CS prop, some day I will finish my 7 and I want to go with 200-230 HP. Can anyone give me some rate of climb #s in their FP and CS aircraft. I know CS will climb better but trying to justify the 10-15K added cost to the project. Thanks.

[DanH]

Originally Posted by bret

I am still on the fence to go FP or CS prop, some day I will finish my 7 and I want to go with 200-230 HP. Can anyone give me some rate of climb #s in their FP and CS aircraft. I know CS will climb better but trying to justify the 10-15K added cost to the project. Thanks.

Put a Hartzell BA on it...bulletproof and doesn't cost 10-15K.

[Neal@F14]

Originally Posted by DanH

Put a Hartzell BA on it...bulletproof and doesn't cost 10-15K.

This.

The BA prop for a 180-200hp is $6980 from Vans.
The prop governor is $1250
You've gonna buy a spinner kit anyway no matter FP or CS prop.
Add in a couple hundred more for cables, brackets, misc hardware.

$8500-8700 ballpark cost.

If I had the money, I'd convert my RV-6 in a heartbeat, and I've only got 160hp on the nose (could use some more weight up front anyway).

[jjconstant]

...and SUBTRACT the cost of the fixed pitch to get the actual difference in cost. $1650 for a 3 bladed Catto for an IO-360, so realistically it's a ballpark of 7K$ additional. WAAAAY less than 10-15K$ "added" to the cost of the project

[Neal@F14]

Originally Posted by jjconstant

...and SUBTRACT the cost of the fixed pitch to get the actual difference in cost. $1650 for a 3 bladed Catto for an IO-360, so realistically it's a ballpark of 7K$ additional. WAAAAY less than 10-15K$ "added" to the cost of the project

Very good point indeed.

[RV7ator]

Don't forget the superior loadability of a Hartzell out front vs. anything lighter. The more forward empty c.g. lets you put more pig iron in the baggage area.

When FP friends ride in my Hartzell-equipped -7, the usual comment is something like, "This thing's a rocket!". Numbers will be tough to normalize because FP may not all be the same pitch, yet the seat-of-the-pants difference from a CS is very obvious. Broadly, the CS is turning 2700 rpm, the FP maybe 23-2400 at Vy, that's that much less horsepower.

For my pricy opinion I ask why are you leaning toward performance with 200-230 hp, then hobbling the engine with a FP? That's quite a concept dissonance.

John Siebold

[gtmule]

Solo, full fuel, i show about 1500 fpm at 100-150 mph. 180 hp carbed 7 with metal fp...

[n5lp]

I find that people rarely leave the CS prop at 2700 RPM for long. When it comes back to 2400 the CS and FP perform about the same. So what is that, one minute per flight or so? Well worth it for some and there are other CS advantages but for me, I have been able to hold out when I look at what that one minute a flight would cost me.

[mosquito]

Originally Posted by jjconstant

...and SUBTRACT the cost of the fixed pitch to get the actual difference in cost. $1650 for a 3 bladed Catto for an IO-360, so realistically it's a ballpark of 7K$ additional. WAAAAY less than 10-15K$ "added" to the cost of the project

A new three bladed Catto is $2150, two blades are $1650. I've seen the old price on the website, but I have this on pretty good authority. You're also going to want the nickel leading edges, at $200/blade, so you're at $2750. The gap narrows... Personally, I'd have gone CS by now were it possible w/my O-320.

-jon

[hydroguy2]

during the winter I see >2400fpm at 100kts, 1/2 tanks and solo. 190hp 360

coming home from Osh2012, Mobridge, SD it was 97*F and we were FULL! max weight. I was still showing 1200fpm+ climbing through 8500' (>10000'DA)

BTW-I leave my prop all the way in quite often.