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1. 11:24 PM - Re: 3 bladed conversion (W J R HAMILTON)
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| Subject: | Re: 3 bladed conversion |
--> Commander-List message posted by: W J R HAMILTON <wjrhamilton@optusnet.com.au>
Folks,
I note the comment about cruise speeds 2 v. 3 blades.
Several friend recently upgraded their C-310A. Manufacturers STC etc. The
outcome was a disaster, turned out no testing on this model had been done,
the vibration on takeoff was frightening. After much investigation,
balancing etc., nothing changed. All of a sudden, the manufacturer decided
a full refund would be a real good idea, it was an inherent couple that was
causing the highly dangerous situation.
Also, with a later model C-310, the only discernable performance change was
a loss of about 4kt IAS in cruise, which worked out at about AU$7500 per
knot, ripper deal.
Cheers,
Bill Hamilton.
At 01:57 4/01/2005, you wrote:
>--> Commander-List message posted by: "Dan Brady" <westwind@hdiss.net>
>
>For what it's worth, many years ago I flew just about every old "bath
>tub" commander made(although at the time they weren't very old). 1
>comparison I recall was between 2 520s, 1 with 2 blades & 1 with 3 blades.
>At the time most of our flying involved gravel strips & unimproved landing
>sites so the main benefits to us were less prop damage due to more ground
>clearance, less cabin noise, slightly shorter TO distance & climb
>performance plus the fact that it was a factory improvement as opposed to
>an after-market mod. Since the 3 blade upgrade also included an increase
>of 15hp per engine, the increased TO & climb performance wasn't due just
>to the 3 blades......plus the 2 bladder even with less hp got slightly
>better cruise speeds. Fast forward to 16 years ago when we got our present
>"straight" commander with 0540 lycs we looked into upgrading to 3 blade
>Black-Mac conversions & were assured that we could get approval for this
>conversion but after getting the cost estimate we !
>decided not to pursue it further so I do not know the FAA's position. I
>did have a customer who had it done to his 250 Comanche and was pleased as
>punch with it due mainly to the increased ground clearance. I hope this is
>of some help to you.......Dan Brady the desert duck.
>
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