KR> Outboard wing tanks
Steve wrote: How close to the rear of the forward spar should the back of the tank be? Steve, I have aluminum tanks in my outer wings. They run almost to the tips. Inboard they are 14 inches aft toward the rear spar and outboard they are nine inches deep. My tanks are almost right up against the forward spar, with the 1/4" space between spar and tank side being filled with expanding foam. This helps keep the tank in position and prevents chaffing of the two. Baffles for long tanks are a must. I have two in each tank. Without them you are at great risk in uncoordinated flight of your plane becoming unbalanced and difficult to control. As far as CG, my plane does not move more than one third of an inch between full tanks and empty ones. I usually do not have to make more than one or two small trim changes on a long cross country flight due to shifting CG. If you make your tanks so they go all the way to the aft spar this probably is not the case, but that is opinion. Have a joyous Thanksgiving. IHS, Dave "Zipper" Goodman Vertical Avionics, Inc. www.verticalavionics.com
KR> Outboard wing tanks
Steve Phillabaum wrote: >> I am building my wing tanks from Fiberglass. (Final Choice). But as far >> as size goes. Because I have the forward spar that is 8 inches tall I >> plan to make my tanks. 6 inches tall at the spar, 10" wide, 5" deep at >> the rear (for the root end). 36" long. 4 inches tall, by 10" wide by 3" >> deep (for the tip end). This will give me approximately 7.00 gallons >> each. Also will give me about 1" of foam between tank and wing skin.<< What you're describing is almost exactly what I built for my outer wing tank, except mine was 8 gallons, and extended 40" starting at about 8" from the stub (root) end of the outer wing. It'll work fine...go for it... Mark Langford n5...@hiwaay.net website www.n56ml.com
KR> Outboard wing tanks
At 07:34 AM 11/24/2010, you wrote: >The question I propose is; How close to the rear of the forward >spar should the back of the tank be? >Steve Phillabaum +++ All my fuel is in the outboard wing panels only, 12.5 gallon each side. They start at the root and extend to the 36 inch rib at the end of the wing. They extend just 10 inches behind the forward spar. That puts them so close to the C.G. that my C.G. changes just one inch from full to empty tanks. If you are only looking for 6 or 7 gallon per side you could make them even narrower and longer and keep them right on the C.G. Install some good baffles to avoid slosh and you won't even know they are out there. Off net for the next three days. Have a good holiday... Larry Flesner
KR> Outboard wing tanks
The question I propose is; How close to the rear of the forward spar should the back of the tank be? I am building my wing tanks from Fiberglass. (Final Choice). But as far as size goes. Because I have the forward spar that is 8 inches tall I plan to make my tanks. 6 inches tall at the spar, 10" wide, 5" deep at the rear (for the root end). 36" long. 4 inches tall, by 10" wide by 3" deep (for the tip end). This will give me approximately 7.00 gallons each. Also will give me about 1" of foam between tank and wing skin. Will the 10" wide (front to back) be a problem with weight and balance? or should I make them longer but yet narrower? I still want to stay just above the 6 gallon volume. I hope to start working on them this Saturday while I am forced to be at work just to watch workers on site. P.S. I am building them per one of the Tony Bingelis' methods. Steve Phillabaum KR2Swide Shorter, Alabama 334-740-0066
KR> outboard wing tanks
Larry I love this idea but, your pic shows only 1 tube recessed into the ribs. How do you get 12 gal per side with only 1 tube? I calc that one 5"x72" tube is 6 gal. Here is what I came up with for 12 gallons. http://www.kr2seafury.com/11.html, scroll down and hit refresh if you don't see it at first. And I thought the engine decision was going to be hard. This fuel tank business is a much harder decision. But I am zeroing in on my design. Craig www.kr2seafury.com --- On Mon, 10/25/10, Larry Flesner <fles...@frontier.com> wrote: From: Larry Flesner <fles...@frontier.com> Subject: Re: KR> outboard wing tanks To: virg...@bellsouth.net, "KRnet" <kr...@mylist.net> List-Post: krnet@list.krnet.org Date: Monday, October 25, 2010, 9:26 PM My tanks are in the outboard wing panels only, 12.5 gallon in each wing and no header tank. They run from root to tip and extend only 10 inches behind the forward spar. From full to empty tanks my C.G. shifts forward 1 inch. I seldom run them completely full. Most of my local flying is done with 1/4 to 3/4 full tanks. fo.html
KR> outboard wing tanks
> > >Do you have any pictures of your tanks installed? >Craig The only photo I have posted is http://mysite.ncnetwork.net/resr9a57/22.jpg it is at the bottom of my web page http://mysite.ncnetwork.net/resr9a57/ Larry Flesner
KR> outboard wing tanks
Hi Larry, Do you have any photos of your tank? Gods Speed, J.E. Caudle Fenwick, WV 363TB (On the Bench) <> My tanks are in the outboard wing panels only, 12.5 gallon in each wing and no header tank. <>
KR> outboard wing tanks
Larry Do you have any pictures of your tanks installed? I like the idea and think others would like to see them too. Didn't see any on your webpage. Thanks Craig www.kr2seafury.com --- On Mon, 10/25/10, Larry Flesner <fles...@frontier.com> wrote: From: Larry Flesner <fles...@frontier.com> Subject: Re: KR> outboard wing tanks To: virg...@bellsouth.net, "KRnet" <kr...@mylist.net> List-Post: krnet@list.krnet.org Date: Monday, October 25, 2010, 9:26 PM At 09:09 AM 10/25/2010, you wrote: >How big is your Bladder ? Virg === It's not just about bladder as Mark pointed out in an earlier post. He can now make cross country trips, out and back, without refueling. I carry 4 hours of fuel (25 gal) and on my longest cross
KR> outboard wing tanks
At 09:09 AM 10/25/2010, you wrote: >How big is your Bladder ? Virg === It's not just about bladder as Mark pointed out in an earlier post. He can now make cross country trips, out and back, without refueling. I carry 4 hours of fuel (25 gal) and on my longest cross country to date I made a fuel stop after two hours to stretch and purchase some cheap auto fuel. My tanks are in the outboard wing panels only, 12.5 gallon in each wing and no header tank. They run from root to tip and extend only 10 inches behind the forward spar. From full to empty tanks my C.G. shifts forward 1 inch. I seldom run them completely full. Most of my local flying is done with 1/4 to 3/4 full tanks. I use two electric fuel pumps that can pump from either or both tanks, no engine driven fuel pump. I also have a small (4 AH) backup battery in case I lose my electrical system. That happened once and the backup battery kept the engine running without a miss. 385+ hours and no problems in spite of the fact that many said it couldn't be done. On a 7 foot long tank you'll want to make sure it is well baffled to eliminate any slosh. Larry Flesner
KR> outboard wing tanks
How big is your Bladder ? Virg On 10/25/2010 3:52 AM, John Martindale wrote: > inner part of the outer wing between spars. That's 4 to 5 hours flying > depending on your engine size..why go to tip tanks?? > > >
KR> outboard wing tanks
Craig, yes they have. Search the archives. Spin recovery with the extra weight on the tips versus rudder effectiveness, aileron effectiveness in lifting the tip at low airspeeds and fuel lift from the lower tank in an unbalanced steep turn are two issues to think hard about. Also if you drop a wing on landing the tip is the last place you want leaks and sparks. You can get well over 100 litres in the standard KR tank plus stub tanks and the inner part of the outer wing between spars. That's 4 to 5 hours flying depending on your engine size..why go to tip tanks?? John Martindale 29 Jane Circuit Toormina NSW 2452 AUSTRALIA ph: 61 2 6658 4767 mobile: 0403 432179 email: john_martind...@bigpond.com _ From: krnet-bounces+john_martindale=bigpond@mylist.net [mailto:krnet-bounces+john_martindale=bigpond@mylist.net] On Behalf Of Craig Williams Sent: Monday, 25 October 2010 1:03 PM To: kr...@mylist.net Subject: KR> outboard wing tanks Still thinking about fuel tanks. I have seen at least 3 KR's in South Africa with tip tanks. It's a thought but I was looking at my RAF48 skins and wondered if anyone has used the wing outboard of the spars to create an internal tank. My rough calc puts the volume at 10 gallons. Craig www.kr2seafury.com ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html _ No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1144 / Virus Database: 422/3217 - Release Date: 10/24/10
KR> outboard wing tanks
Still thinking about fuel tanks. I have seen at least 3 KR's in South Africa with tip tanks. It's a thought but I was looking at my RAF48 skins and wondered if anyone has used the wing outboard of the spars to create an internal tank. My rough calc puts the volume at 10 gallons. Craig www.kr2seafury.com
