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Old 04-06-2021, 11:17 AM
markserbu's Avatar
markserbu markserbu is offline
Join Date: Apr 2018
Location: Tampa, Florida
Posts: 8
Default Clever solutions to single-pilot forward CG issue?

Hi, just recently bought this RV-8A (picture for attention) and the previous owner's solution to single-pilot operation was to strap a 60-pound plastic water "jug" into the rear seat. This works to put the CG right where it needs to be but makes getting into the baggage compartment a bit of a pain, plus lifting that weight in an awkward position isn't the best idea for my old back! Doing the math on the CG it looks like I can get away with a 20 pound weight pretty far back towards the tail, but then getting it out would be difficult. What have you guys done about this issue? Anyone running a CS carbon fiber prop instead of aluminum to help with the CG? Thanks!
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Old 04-06-2021, 11:46 AM
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Ironflight Ironflight is offline
VAF Moderator / Line Boy
Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,606

Years ago, I used to carry a case of oil in teh baggage compartment when flying around local. then I more regularly started carrying a person in the back and going cross-country - the oil came out and I just never member top put it back in....

On lighter props - yes - I am now flying a WW-300, which saves about 16 pounds on the nose - you can definitely feel the difference. Great prop.

Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
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Old 04-06-2021, 01:41 PM
smithflys23 smithflys23 is offline
Join Date: Feb 2017
Location: Jupiter
Posts: 229

You could try one of these for your aft baggage. You can customize the weight based on volume.
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Old 04-06-2021, 01:49 PM
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Carl Froehlich Carl Froehlich is offline
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,947

Move the battery off the firewall to the aft standard battery mount location.

I run a IO-360-M1B with Hartzell CS prop. One PC-625 battery mounted in the forward baggage well, the second mounted in the aft location. The W&B came out about as best it can.

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Old 04-06-2021, 02:14 PM
rocketman1988 rocketman1988 is offline
Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,438
Default How about...

Collapsible carbouy. Easy to carry empty and weighs almost nothing. Fill with water when you need it...
Aerospace Engineer '88


Dues+ Paid 2020,...Thanks DR+
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Old 04-06-2021, 02:27 PM
gasman gasman is offline
Join Date: Mar 2007
Location: Sonoma County
Posts: 3,941

How about an adjustable cg.....

A tube with a diameter of 2 to 2.5 inches and a length of 13 inches PROPERLY installed
across the tail cone at the width of about 13 inches. Access port on one side to slide in a 2" or 2.5" round bar of lead.
2X13= 16.7 lbs.
2.5X13=26.1 lbs. Need more weight??
3X13= 37.6 lbs.

You could make your cg extatically where you want it.
VAF #897 Warren Moretti
2020 =VAF= Dues PAID
Save the Planet…...............It’s the only place that has beer!
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Old 04-06-2021, 03:00 PM
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rv8ch rv8ch is offline
Join Date: Feb 2005
Location: LSGY
Posts: 3,749
Default wet playground sand

During my flight test phase I used many small ziplock freezer bags of wet kid's playground sand - total was about 100kg (220 freedom units) spread between the forward baggage area, rear baggage area, and passenger seat. I had them in multiple shopping bags to make them easier to move, and strapped them down tightly in the rear baggage area and the passenger seat.

My thinking was in case I had an off-field landing, what do I want hitting me in the back of the head? Nothing! The other thing I considered was small bottles of water, but the sand was a bit more dense.

I like the big water bag idea - they look like they can be strapped down securely.

I'm now flying mostly empty, with only the aircraft cover in the rear baggage area. I can feel the CG difference but it's not much of an issue. I have a heavy metal hartzell, with an io-360 and a tiny earthx on the FW. Full 3-pointers require pretty good speed control, and a standard tail low wheel landing is easy.
Mickey Coggins
"Hello, world!"

Last edited by rv8ch : 04-06-2021 at 03:04 PM.
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Old 04-06-2021, 03:52 PM
Chkaharyer99 Chkaharyer99 is offline
Join Date: Oct 2011
Location: Pilot Hill, CA
Posts: 853

I fly my RV8 without passengers most of the time.

My Odyssey PC 680 battery is on the firewall.

For a ballast, I have a new, (unused) 25 lb bag of kitty litter. I put the sealed bag of litter inside a cardboard box and taped it up. I put the ballast in my rear baggage compartment.

Works satisfactory. I like the water idea too. The battery in back is the best solution. Minimal weight added.
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Old 04-06-2021, 09:07 PM
David Z David Z is offline
Join Date: Aug 2010
Location: Thunder Bay Ontario
Posts: 603
Default Water

Water is great because it can be dumped out on the ramp and nobody cares. Then later, it can be refilled for almost free.
Empennage Passed Pre-close Inspection
Wings mostly done
Fuselage started
Dash 8 day job is financing the RV8
Donation till September 2021
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Old 04-06-2021, 09:41 PM
Join Date: May 2005
Location: Fresno to Bakersfield
Posts: 104
Default What I carry. . .

Husky Tools tool bag. Traveling tools. 1 qt of oil, and 2 - 10lb barbell plates (non Olympic). Strapped down in the aft baggage. If the GIB is onboard and we’re going somewhere. The barbell plates are easily removed and the baggage compartments are filled with stuff like hair dryers and makeup and stuff.
RV8 - Adoption Complete / Beautification in Progress
RV14A Build/Kit - SOLD

12/28/20 Donated
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