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"I have heard various figures from 68 to 72 inches"
The following is copied from Hartzellprop.com and should clarify
things. F7666A-4 is the old (original) blade design for the 360 180 hp
version, F7068-2 is the "new" design (1995) and was made specifically
for fast glass, thus the blades have more twist. They should be a
couple of kts. faster and look way cooler too (see photo)!
If you plan on buying a Hartzell prop, buy a NEW one unless you like
having your hub eddy current inspected every 100 hrs. (yes, new SB to
the unaware)!
Hartzell props are HEAVY chunks of metal, so you should consider the
alternatives:
aerocomposites.com (few have experience with them but lots of promises
made)
whirlwindpropellers.com (even less have experience with these props,
accordingly more promises made)
mtpropeller.com (lots of people have so much experience these props
that their leaking blade seals are now considered a fact)
Some RV8 feller has tested various Whirlwind mills vs. a Hartzell,
quite a good article, see
http://www.romeolima.com/RV8/Prop.htm
Very best regards
Tim Jorgensen
360MKIIFB / 60%, proud owner of a set of 7068-2 blades on a newly OH´ed
hub that now has to be eddy current inspected every 100 hrs. #¤%&#!!!!
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Manufacturer: Lancair Aircraft
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Aircraft Model(s): Lancair 360 180 hp @ 2700 rpm, Lancair
360 200 hp @ 2700 rpm
Applicable Engines: IO-360-B 180 hp @ 2700 rpm
IO-360-A 200 hp @ 2700 rpm
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(click to enlarge)
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| Propeller Model &
Components: |
| COMPONENT |
DESCRIPTION |
| Propeller |
200 HP HC-F2YR-1F/F7666A-4 |
| Propeller |
180 HP HC-F2YR-1F/F7068-2
(68" propeller) |
| Propeller |
180 HP HC-F2YR-1F/F7666A-4 |
| Spinner |
LANCAIR |
| Governor |
LANCAIR |
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Features:
HC-F2YR-1F/F7666A-4 PROPELLER DESIGN HAS BEEN
EXISTING DESIGN FOR 180 & 200 HP CONFIGURATION SINCE THE BEGINNING
OF THE PROGRAM. THE HC-F2YR-1F/F7068-2 68" PROP WAS DEVELOPED IN 1995
TO INCREASE CRUISE SPEED WHILE REDUCING DIAMETER. With original 72"
propeller, ground strike was a problem.
Specifications:
72" & 68" DIAMETER
FOR 180 HP AIRCRAFT
72" MINIMUM DIAMETER FOR 200 HP
AIRCRAFT
6 YEAR 2400 HOUR TBO
BOTH PROPELLERS ARE 2-BLADE
Restrictions:
The following
restrictions apply to the Lancair 360:
For HC-F2YR-1F/F7666A-4 on
IO-360-A 200 HP, "Avoid continuous operation between 2000-2350 RPM" on
non-dampered engines. No restriction on dampered engines. For this
propeller model on the IO-360-B 180 HP engine, "Avoid continuous
operation between 2000-2250 RPM". If engine has crankshaft dampers or
Hartzell C1576 inertial damper, no RPM restrictions apply.
For HC-F2YR-1F/F7068-2 propeller
on the 180 HP IO-360-B,E & F undampered engines, the following
restrictions apply: 1. "Stabilized operation is prohibited above 25"
manifold pressure between 2300-2500 RPM". 2. "Stabilized operation is
prohibited below 15" manifold pressure above 2600 RPM". These
restrictions are not significant during normal operations, but were a
result of the testing envelope required in the vibration survey.
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F7068.jpg
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