Tips for new CS Prop with new YIO-360-M1B

Members,

Our RV-6 has a new Hartzell HC-C2YR-1BFP (F7497-2 Blades) and a new YIO-360-M1B.

The great news is there are no limitations from Hartzell. We can run 2700 all day long if so desired.

In flying the B-25 with Wright R-2600, we concern ourselves with reciprocating load. Specifically, we avoid having the manifold pressure x 100 less than the RPM.

For example, if the RPM is 2000, we never want to have less than 20 inches of manifold pressure. Would reciprocating load apply to the Lycoming 360 also?

What WOT and prop settings do you use and why?

Are there any prop/manifold pressure settings you try to avoid? Why?

What airframe? RV-? Call Hartzell. You may have to wait two weeks, due to Oshkosh. I could not find the exact blade and engine combo...

I found one good match.... for 180HP Commanche with your prop:

http://hartzellprop.com/pilots/kit-builders/rv-4-rv-6-rv-7-rv-8-io-360-standard/
The following restrictions apply to the HC-M2YR-1BFP/F7497 propeller on the RV aircraft with Lycoming IO-360-A1A 200 HP engine: “Continuous operations is prohibited above 24 inches manifold pressure between 2350 and 2550 rpm.” {{ It appears there is no restriction for your combo? Electronic Ignition restriction? See note below. }}

http://hartzellprop.com/products/top-prop/piper/pa24-180hp-comanche-scimitar/
"Placard – “Avoid continuous ops. between 2000 and 2250 RPM.” {{ Does not say -M1B (180HP), likely -A1A, but close enough. Elect Ignition issue still? See note below }}

http://hartzellprop.com/pilots/kit-builders/rv-4-rv-6-rv-7-rv-8-io-360-standard/
Restrictions: The following restrictions apply to the HC-M2YR-1BFP/F7497 propeller on the RV aircraft with Lycoming IO-360-A1A 200 HP engine: “Continuous operations is prohibited above 24 inches manifold pressure between 2350 and 2550 rpm.” {{Does not apply to you but shown for reference}}
This is the type cert spec for the prop.
http://11hc.44rf.com/manuals/engine-prop/prop/Prop_Hartzell_P-920_data_sheet.pdf

HC-C2YR F7666A
LYC IO-360-M1A, -M1B
76 74 (dia range)
Avoid continuous operation between 2000 and 2350 RPM {{Does not apply to you but shown for reference}}

I have not kept up with the details but a lot of the early restrictions were due to electronic ignition. How the electronic ignition fits in today, I don't know.... but that was a big deal to Hartzell back in the day. Hartzell decided they could not test and validate every combination under the sun. So you are responceable. From above avoid 2000-2350 rpm you are good.


What WOT and prop settings do you use and why?
Are there any prop/manifold pressure settings you try to avoid? Why?

Typically WOT and Full 2700 RPM for take off. Once above 500 feet thottle back to 25" and 2500 RPM and use that for climb. Level flight set what you like. Typcially you don't want more MAP than RPM.... For cruise I like 2300 RPM and 23" Map or as much MAP availiable at altitude. By 8500 feet altitude you can't hold 23". So WOT and stay out of what ever RPM limit hartzell gives you in two weeks if any....

YIO-360-M1B and HC-C2YR-1BFP here (not the 2" shorter blades, however)...i.e., what Van's offers. No limitations.

And the whole "over-squared" thing is an OWT (not sure what the OP is talking about when he says "we avoid having the manifold pressure x 100 less than the RPM." I think he means more, but no matter, cause if it's on the engine performance charts, it's okay.

My friends say I have two throttle positions: WOT and idle. Usually 2500 RPM from top of the initial climb to 1000' AGL for the duration of the flight until nearing the destination.

Here is the documentation regarding NO limitatons from Hartzell. Our plane is an RV-6