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Old 04-16-2018, 03:50 PM
Adam W Adam W is offline
Join Date: Feb 2016
Location: Thornhill, Ontario, Canada
Posts: 98
Default prop choice

Hey all

canopy done engine hung yesterday, and on to the cowl. This had me thinking Do i need a propeller to properly fab up the cowl?
and if so, I'm not prepared research wise for that decision
I am constant speed, IO-360 Fuel injected with a cold air superior sump with horizontal intake. from a weight perspective its a slider with a G3X dual screen system and GTN650 planned. no steam gauges.
I guess the look and smoothness of three blade is the wish. question is composite or aluminium? and size?
I'm no expert on the W & B math so any advice here on what is best would be great. I expect the composite CS will be very expensive. I also heard the composite may cause an aft C of G reducing baggage capacity
id appreciate any advice on what prop to go with. my mission will include some shorter grass strips, but not under 1600 feet
im building a 7
Adam Wachtel
Thornhill Ontario Canada
Building RV7 #70770
90% Done 90% To Go
Vans Airforce Dues Paid
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Old 04-16-2018, 05:38 PM
Jpm757 Jpm757 is offline
Join Date: May 2013
Location: Sherman, CT
Posts: 284

Finished my -7 in Nov., now with 100hrs and counting. I have an IO-360 M1B with an MT 3 blade that I purchased thru Van's. I could not be happier with this combination. The delivery time was about 14 weeks on the prop and I was ready to fit my cowlings long before expected delivery. I rented the Flyboys cowlings installation tool and used the MT dimensions to fit the cowling. When the prop arrived (spinner mounted and painted), I just bolted it on and VIOLA! Perfect fit. Very smooth prop as well as good ground clearance for unimproved strips. My EW came in at 1081# CG 80.4 with dual AFS 5600 displays and autopilot. Pricier than the Hartzel, but if you figure in the spinner assy.and labor, its comparable.
RV6 completed 1991 sold.
RV7 #72018 N767T first flight 11/21/2017 170+ hrs.
IO-360M1B MT 3 blade, Dual AFS 5600.
1941 J3 Cub skis floats.
2019 dues gladly paid.
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Old 04-16-2018, 09:03 PM
9GT's Avatar
9GT 9GT is offline
Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,563

The 3 blade MT I ordered last month for my -9A is through Tiffin Aire . I saved considerable $$$$ going through them as apposed to Van's. They are a dealer and authorized service center for MT.
David C.
Howell, MI

RV-9A: Under Construction.
RV-10: Completed 12/29/2013 SOLD 08/23/2016

"Donor Exempt" but donated through Dec. 2019
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Old 04-17-2018, 10:56 AM
mike newall's Avatar
mike newall mike newall is offline
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 1,701

MT 3 blade - awesome takeoff and landing performance, couple of knots slower cruise, but super smooth and great 'ramp presence' (I do hate that saying )
"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q

Donated in 2018
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Old 05-12-2018, 02:30 PM
Chattin35 Chattin35 is offline
Join Date: Jul 2014
Location: Boise, ID
Posts: 233
Default Get a Hartzell BA prop

The -7 was designed around the parallel valve Lycoming 360 and Hartzell CS prop. I have that combo on my -7 and the W&B came out beautifully. It's almost impossible to load it out of limits. Not to mention, it feels perfectly balanced in flight.

Also, I highly recommend a CS prop. Putting anything else on an RV is like buying a sports car and only driving it in 2nd gear. It hurts the pocket book initially. But, it'll make up for it in fuel savings over time (I actually did the math back in the day). And, the performance gains in all phases of flight are substantial.

My 2 cents.
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Old 05-13-2018, 12:55 AM
gasman gasman is offline
Join Date: Mar 2007
Location: Sonoma County
Posts: 3,507

Maintain it IAW Hartzell, and it will be the most expensive single item on the aircraft to maintain.
VAF #897
2019 =VAF= Dues PAID
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Old 05-13-2018, 07:15 AM
robertahegy's Avatar
robertahegy robertahegy is offline
Moderator/Tech Counselor
Join Date: Jan 2005
Location: East Troy, WI
Posts: 1,939

My 7A with 0-360 A1A and Hartzell BA prop was a great combination. Well balanced and smooth as glass out of the box.

Roberta Hegy
Built/Flew an RV-7A
Air Troy Estates, East Troy, WI
Ford Expedition and TRICE "Q"
Built Glen L "ZIP" Classic Outboard Runabout and Super Spartan Hydroplane
Glen L Torpedo
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Old 05-13-2018, 08:23 AM
schaplerrh schaplerrh is offline
Join Date: Mar 2014
Location: Alexandria VA
Posts: 279
Default prop choice

I'm happy with the 2-bladed acro MT on my -7.
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Old 05-13-2018, 10:43 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,850

The biggest mistake I made on my first RV was putting a FP prop on it. At 300 hours I replaced it with a Hartzell BA prop. To say the change was dramatic fails to capture the impact. I was now flying the plane that I always wanted. As previously posted, the speed range on an RV is so broad no FP prop will come close to meeting the changing conditions.

For those builders that ask me, I say:
- If you want a simple plane for flying around the patch and occasional cross country, or canít justify the additional cost, pick one of the many FP props out there and fly on. It will still fly like an RV.
- If you want to spend a boatload of money and go fancy, pick one of the composite CS props.
- If you want the very best bang for the buck and are obsessed with high efficiency cruise and top speed, get the Hartzell BA prop.

The brand new Hartzell prop for the current RV-8 build is in the hangar - engine and prop hang in a couple of weeks.

Sorry if I stepped on any toes.

And the debate goes on....
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Old 05-13-2018, 10:52 AM
Rick_A's Avatar
Rick_A Rick_A is offline
Join Date: Oct 2005
Location: Highland Village, TX
Posts: 1,436

Originally Posted by gasman View Post
Maintain it IAW Hartzell, and it will be the most expensive single item on the aircraft to maintain.
Please explain. My Hartzell has been trouble free for 9 years & 900 hours. So my only maintenance cost is a little bit of grease once a year.

I know that Hartzell states the recommended overhaul is at 2400 hours or 72 months calendar time. I just had the calendar time discussion a couple of weeks ago. In short, maybe if you plane is kept outside in harsh conditions 72 months maybe valid. However, for most of us 2400 hours is the better guideline.
Rick Aronow,
Flying 7A Slider;
RV-12 (ELSA, Dual G3X), SOLD
Highland Village,TX
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