"Normal" Static RPM's (New Pilots Read Before Flight!)

[Chucker]

Aircraft: Sonerai II LTS
Fly with passengers: Maybe
Gross weight: 1150 lbs (on paper)
Engine: Revmaster 2074cc 78x92
Carb: Revflow 34mm
Prop: Ed Sterba 54x46
Prop alterations: None
Static RPM: 3350

 

[Chucker]

I should add that my field elevation is 5,045' MSL.

 

[kennyw]

Aircraft: 2L
Fly with passengers: Yes, light ones!
Gross Weight: 1050
Engine: Blueprinted GP1835cc, 92mm x 69mm
Carb:Zenith
Prop Manufacture: Props Inc
Prop dimensions: 54x42
Prop alterations from stock: None
Static RPM: 2900
Empty weight 555
500FPM climb at GW 2950RPM/33"
150MPH at 3200 WOT
*These numbers definitely reflect a "cruise propeller" but is very smooth, efficient and fast on less fuel. Considering purchase of a 50X42 for testing

V/R
RR

The above was 994SP with Smokey's old Props Inc. Prop. Below is the new numbers with new Sterba prop and new owner.

Aircraft: 2L
Fly with PAX: not yet
Max Gross Weight: 950
Engine: Custom (Mostly GPAS) 1835 (92mmX69mm)
Carb: Zenith
Prop Manufacturer: Ed Sterba
Prop Dimensions: 52X42
Prop Alterations: None
Static RPM: 3100
Empty Weight: 557
Takeoff Rate of Climb: ~650fpm @ 3,140rpm/33 inHg
Max Level Cruise 140mph @ 893lbs GW

Here's an interesting article from EAA that is relevant: https://www.eaa.org/eaa/aircraft-bu...nd-spinners/the-fixed-pitch-propeller-dilemma

 

[Mytonic]

Aircraft: 2LS
Fly with PAS: not yet
Max Gross Weight: 1150
Engine: Custom 2180 82x92 compression 7.4
Carb: Aero-Inj
Prop Manufacturer: Ed Sterba
Prop Dimensions: 54x47
Prop Alterations: None
Static RPM: 3000 28 inHg
Empty Weight: 620
Takeoff Rate of Climb: ~750fpm @ 3,000rpm/28 inHg. 2000 Alt
I think it would be helpful to have compression ratios and manifold pressure numbers included in the data. Does any one know how much an increase in compression would affect rpm?

 

[Chucker]

John,

Try this online calculator to determine HP

http://www.bgsoflex.com/crchange.html
Then go here to calculate RPM

http://godolloairport.hu/calc/strc_eng/index.htm
I doubt that the numbers are exact....but might give you an idea

 

[Mytonic]

Thanks John, Exactly the information I needed.

 

[Chucker]

Just to update my own numbers:

Aircraft: Sonerai II LTS
Fly with passengers: Maybe
Gross weight: 1050 lbs (adjusted for engine smaller than 2180cc)
Engine: Revmaster 2074cc, 78x92, CR 8.5:1
Carb: Revflow 34mm
Prop: Ed Sterba 54x46
Prop alterations: None
Static RPM: 3350 at 5,045'MSL airport elevation