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  #1  
Old 08-31-2018, 11:04 AM
Varga to Vans Varga to Vans is offline
 
Join Date: Apr 2017
Location: Rolla, MO
Posts: 5
Default RV-8A engine, prop and battery position

Considering using a IO-360 180 Hp engine with a Sensenich Composite ground adjustable Prop in RV-8A build. Any experience and comments on this combination would be appreciated. Composite prop weight is considerably less than metal prop. Wondering if battery would need to be moved to forward location for better weight and balance.
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Old 08-31-2018, 03:15 PM
greghughespdx greghughespdx is offline
 
Join Date: Nov 2011
Location: Aurora, OR
Posts: 467
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You'll need to do the math calculations. I know on the 8A I'm building that your combination would pretty much require the battery be located on the firewall (or at least not in the tail cone).
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  #3  
Old 08-31-2018, 03:37 PM
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Carl Froehlich Carl Froehlich is offline
 
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Location: Dogwood Airpark (VA42)
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For that combo a battery in the forward baggage well would be about right. Two batteries could be done as well, one on each side of the fuselage on the floor just aft of the firewall. Did that on my first plane (RV-8A) with two PC-625 batteries.

Carl
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Old 08-31-2018, 03:58 PM
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Chino Tom Chino Tom is offline
 
Join Date: Jun 2005
Location: Chino, CA
Posts: 706
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My -8A has the Odyssey PC680 mounted on the engine side of the firewall.
O-360 A1A with a Hartzell BA CS prop. No forward CG issues with this
config. Also, nice short battery cable wire runs.
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  #5  
Old 08-31-2018, 06:25 PM
Northernliving Northernliving is offline
 
Join Date: May 2005
Location: Boston, MA
Posts: 111
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Quote:
Originally Posted by Varga to Vans View Post
Considering using a IO-360 180 Hp engine with a Sensenich Composite ground adjustable Prop in RV-8A build. Any experience and comments on this combination would be appreciated. Composite prop weight is considerably less than metal prop. Wondering if battery would need to be moved to forward location for better weight and balance.
Put the battery on the firewall.
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  #6  
Old 09-01-2018, 07:02 AM
Robert Anglin Robert Anglin is offline
 
Join Date: Mar 2008
Location: houston, texas
Posts: 847
Default Fire Wall.

I think you will find that for this configuration the factory location on the fire-wall will be the easiest and most liked spot. We started out with an E.C.I. IOX-360 with a Prince carbon "P" tip prop on it and the E.C.I. tapered "C" cylinders.
This made our engine as light as we wanted with a little extra power. We really wanted to have two batteries split by a Blue Water switch as a master. We first installed the batteries at the rear factory location and put the master on the right kick panel. This was a very good set-up and we liked it, BUT. Once we got the aircraft ready for fight testing and weighed it, we found that we lost full use of our rear baggage capacity. We wanted to be able to use this platform to its fullest potential so we went back and pulled all the rear battery installation and placed a single PC-680 on the fire-wall, just as the plans show. We now can load all 50 Lbs. in the front baggage, full fuel- 252 Lbs., 195 Lbs. in the front seat, 185 Lbs. in the back seat, 50 Lbs. in the rear baggage floor area and 25 Lbs. on the rear baggage shelf, with plenty of room to spare. We ended up at 1008 Lbs. empty, with 792 Lbs. useable. This can give us two 200 pounders in the seats and full fuel to go wear we want and still give us full baggage. Oh and by the way with this power to weight ratio, when you are running light and want to have fun, it makes for a "nice ride".

Just what we did, its your ride and your type of flying that counts on this one. Yours, R.E.A. III #80888

Last edited by Robert Anglin : 09-01-2018 at 07:09 AM.
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