1992 15-foot Unknown Hull SUZUKI DF60a
Posted: Tue Mar 19, 2024 2:32 pm
[This post is seeking advice about a propeller for a] 1992 15-foot hull [of unspecified original model that is only described as being] modified [and powered by a] 2013 SUZUKI DF60a [engine mounted in a position that is ambiguously described with the confusing description] second-lowest hole setting. [The anti-ventilation plate] is 0.625-inches [below the hull bottom].
PLEASE READ THE ARTICLE ON ENGINE MOUNTING HEIGHT NOMENCLATURE. THEN DESCRIBE THE ENGINE MOUNTING HEIGHT IN UNITS OF HOLES OR 0.75-inch INCREMENTS UP FROM LOWEST POSSIBLE MOUNTING.YOUR DESCRIPTION ABOVE OF MOUNTING HEIGHT IS UNCLEAR.
ENGINE DATA
2013 Suzuki DF60a
[Maximum permitted engine speed = ] 6300-RPM
Gear ratio 2.77:1
PRESENT PROPELLER FOR TEST DATA
SOLAS three-bladed 11-1/8-inch x 14-pitch [unspecified material and model]
ENGINE TRIM SETTING DURING TEST
Engine trimmed all the way down. The distance from transom to the leading edge of the gear case is 6-inches.
TEST CONDITIONS
[None given]
TEST DATA
RPM MPH
4000 20
4500 23
5000 27
5100 27.5
[RE-TEST with the engine trimmed out to distance between the transom and leading edge of the gear case increased to 8-inches from 6-inches]
TEST DATA
RPM MPH
5200 29 Note: engine hits rev-limiter
[The meaning of “modified” is further explained in unknown terms as a] bully net boat design.
[The test data was obtained while] driving from the bow of boat.
[No additional engine speed can be used without] spinning propeller.
I plan to [test again with a new propeller of] increase[d] pitch. Then next I will try a stainless [propeller].
PLEASE READ THE ARTICLE ON ENGINE MOUNTING HEIGHT NOMENCLATURE. THEN DESCRIBE THE ENGINE MOUNTING HEIGHT IN UNITS OF HOLES OR 0.75-inch INCREMENTS UP FROM LOWEST POSSIBLE MOUNTING.YOUR DESCRIPTION ABOVE OF MOUNTING HEIGHT IS UNCLEAR.
ENGINE DATA
2013 Suzuki DF60a
[Maximum permitted engine speed = ] 6300-RPM
Gear ratio 2.77:1
PRESENT PROPELLER FOR TEST DATA
SOLAS three-bladed 11-1/8-inch x 14-pitch [unspecified material and model]
ENGINE TRIM SETTING DURING TEST
Engine trimmed all the way down. The distance from transom to the leading edge of the gear case is 6-inches.
TEST CONDITIONS
[None given]
TEST DATA
RPM MPH
4000 20
4500 23
5000 27
5100 27.5
[RE-TEST with the engine trimmed out to distance between the transom and leading edge of the gear case increased to 8-inches from 6-inches]
TEST DATA
RPM MPH
5200 29 Note: engine hits rev-limiter
[The meaning of “modified” is further explained in unknown terms as a] bully net boat design.
[The test data was obtained while] driving from the bow of boat.
[No additional engine speed can be used without] spinning propeller.
I plan to [test again with a new propeller of] increase[d] pitch. Then next I will try a stainless [propeller].