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rv7plt(at)hotmail.com
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 Posted: Tue Mar 20, 2007 4:33 pm Post subject: Hartzell Blended Airfoil Prop |
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I am interested in feedback from readers that have converted from the old
style (C2YK-FB/F7666) to the Blended airfoil prop. I would like to know if
it reduced vibrations. This will help me decide or upgrade or not.
John Henley, RV7, IO-360, 500 hours
_________________________________________________________________
i'm making a difference. Make every IM count for the cause of your choice.
Join Now.
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dan(at)rvproject.com
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| Posted: Tue Mar 20, 2007 5:11 pm Post subject: Hartzell Blended Airfoil Prop |
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John,
Have you had your prop dynamically balanced? I have the same prop as you on
my IO-360-A1B6 and it runs very smooth by my standards. I had it
dynamically balanced to 0.01 IPS early on and it has been great ever since.
Something else to consider is that "vibration" could be a result of any
number of factors -- not just the propeller. Injection imbalance, some part
of the engine (i.e. airbox inlet, alternator pulley, etc.) contacting the
cowling, ignition, etc.
do not archive
)_( Dan
RV-7 N714D (1230 hours)
www.rvproject.com / www.weathermeister.com / www.weighmyplane.com
---
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gmcjetpilot
Joined: 04 Nov 2006
Posts: 170
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| Posted: Wed Mar 21, 2007 11:02 am Post subject: Hartzell Blended Airfoil Prop |
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You will pick up 3-4 mph top speed. Is that not enough?
Vibration comes for many things, old engine mounts,
mass balance in engine (crank, rods, pistons, accessory
section), power imbalance between cyl (one making more
power), Prop or spinner imbalance.
Also baffles or controls or any thing that can transfer the
engine vibrations to the cowl, engine mount or fire wall
will increase the vibration in the cockpit. Cables, hoses,
wire bundles can all do that if too short or tight.
If you have vibration because you prop is out of balance, than
yes you will be smoother, but the real JOY of the new prop is
the incredible efficiency. Hartzell MADE the BA prop for
YOU, for the RV-7.
I suggest you get Lord engine mounts (part J-9613-4). The
cheap ones Van sells suck.
Also the BA prop is a 2000 hr TBO and no AD's or SB prop.
Vibration? May be, but that is not a reason to change to the
BA. The BA is a way better prop for the RV. My suggestion
is use your C2YK prop as long as you can, sell when due
for overhaul/inspection than get the BA. If you plan on keeping
the RV7 for say the next 20 years than get the new prop. It will
pay for itself in lower maintenance and better speed. Too bad
the price just took a jump I noticed in Vans' catalog.
Hartzell REALLY wants you to convert becasue the new prop
has no issues. You may get $1500-$2000 for your old prop,
may be $2,500-$3,000 if low time late model? The new prop is
about $6,000. If you have $4000 burning a hole in your pocket
than it may be a good up-grade.
Do you plan on flying into gravel and mountain strips this
year. May be you should explore first than get the new prop?
George
>From: "JOHN HENLEY" <rv7plt(at)hotmail.com (rv7plt(at)hotmail.com)>
| Quote: | Subject: Hartzell Blended Airfoil Prop
|
| Quote: | I am interested in feedback from readers that have converted
from the old style (C2YK-FB/F7666) to the Blended airfoil prop.
I would like to know if it reduced vibrations. This will help me
decide or upgrade or not.
>John Henley, RV7, IO-360, 500 hours
|
Be a PS3 game guru.
Get your game face on with [url=http://us.rd.yahoo.com/evt=49936/*http://videogames.yahoo.com]the latest PS3 news and previews at Yahoo! Games.[/url] [quote][b]
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rocketbob(at)gmail.com
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| Posted: Wed Mar 21, 2007 12:23 pm Post subject: Hartzell Blended Airfoil Prop |
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Switching to the BA prop should make no difference in vibration if the original prop is properly balanced. As far as speed goes, I asked this very same question to one of the engineers at Hartzell about my Rocket prop and his response was "The differences are small and I would not swap props simply to get the additional performance, its not worth the cost in my opinion."
The difference between the 8475D-4 prop and the 8068D BA blades suitable for a Rocket was four pounds difference in thrust. The non-blended airfoil props are already very efficient.
If you wanted to reduce vibration I would consider a three-blade MT prop.
Regards,
Bob Japundza
RV-6 Flying F1 under const.
On 3/20/07, JOHN HENLEY <rv7plt(at)hotmail.com (rv7plt(at)hotmail.com)> wrote:[quote]--> RV-List message posted by: "JOHN HENLEY" < rv7plt(at)hotmail.com (rv7plt(at)hotmail.com)>
I am interested in feedback from readers that have converted from the old
style (C2YK-FB/F7666) to the Blended airfoil prop. I would like to know if
it reduced vibrations. This will help me decide or upgrade or not.
John Henley, RV7, IO-360, 500 hours
_________________________________________________________________
i'm making a difference.Make [quote][b]
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