Dave, That's a great pipe dream to have. See Larry's comments below. Well, about the heaviest KR2S I've heard of had a gross weight of ~1350 Pounds. Today's KRs run about 700 pounds empty, for the average sort of heavy airframes. If you weigh 180 pounds, you have 470 pounds for baggage and fuel. 30 gallons of MoGas weighs 190 pounds. AvGas 100 weighs 177. Using MoGas, you have 280 pounds to allocate to baggage and more fuel. All these numbers inflated to the max for safety. Maybe use the space in front of the panel for baggage, not fuel, so that fuel burn doesn't affect CG inflight. You will need extra baggage for trans-oceanic flight. And nav electronics.
Quoting Larry, YMMV. Griff From: KRnet <krnet-boun...@list.krnet.org> On Behalf Of Dave Klingler via KRnet Sent: Monday, January 9, 2023 2:05 PM To: KRnet <krnet@list.krnet.org> Cc: Dave Klingler <dave.kling...@gmail.com> Subject: Re: KRnet> Fuel tank Capacities My long-term pipe dream is to attempt to follow Colin Hales' example. Does anyone have opinions about the maximum fuel capacity a KR-2S could handle if built for that mission? Dave Klingler On Sun, Jan 8, 2023 at 1:13 PM Flesner via KRnet <krnet@list.krnet.org<mailto:krnet@list.krnet.org>> wrote: On 1/7/2023 8:39 AM, G R Pickett via KRnet wrote: For those who have a larger-than-VW engine, what total capacity do you think is enough? I'm planning for a tank in each wing, and considering a smaller header tank behind firewall. Flying solo, I think a 3-5 hour leg is about enough before pilot fatigue sets in. I'd like enough in the header to fly at least an hour, with reserve. Griff, Is your project a 2 or a 2S? I would suggest that you need specific needs to tank more than 20 to 25 gallon. With that much fuel the location will be critical for W&B. If it is a 2 I'd suggest a 20 gallon limit and a 2S a 25 gallon limit, all for W&B considerations. Unless you have considerable cross country trips planned you don't need a lot of capacity for a 150 mph airplane. I have 2 each 12.5 gallon tanks but very seldom fly with more than 15 gallon on board. That would give me a 150 mile out and back with 30 to 45 minute reserve. 25 gallon is like adding a 150 pound passenger to your empty KR. How is that weight distributed? If you're adding wing tanks I'd suggest making them long and narrow and as close to the CG range as possible. Large header tanks have their safety concerns and wing tanks have W&B concerns. Extra fuel, any location, has performance concerns. There is no "perfect" airplane. Build yours for your expected missions. Larry Flesner
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