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701 unusable fuel

 
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cffd(at)pgrb.com
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PostPosted: Sun Jun 24, 2007 12:18 pm    Post subject: 701 unusable fuel Reply with quote
My 701 ten gallon wing tanks (no header tank) actually hold 10.8 gallons each.

When the nose is low or in a slip the tank fuel outlet can be uncovered if the fuel is too low.

In general, what is the unusable quantity of fuel for the wing tanks in a CH 701, particularly for landing?

Thanks,
Chuck D.
N701TX
[quote][b]

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jetboy



Joined: 22 Jul 2006
Posts: 233
PostPosted: Sun Jun 24, 2007 1:58 pm    Post subject: Re: 701 unusable fuel Reply with quote
Chuck,

Mine are the same measured at 42.5 litres aside = 10.86 US gal each. I have unported the outlet when running off the tank in nose low and wing down attitudes where the fuel level was lower than 1/4, so I am cautious about feeding off the one side if the level is less than about 12 litres (3 gal) and switch to both for landings. I have cruised on one tank down to 1/8 without problems. The 5 times the engine shutdown were all during manouvers with lots of wing down nose down descent, and it recovered when the I levelled out, after a delay maybe 20 seconds. In some cases I switched tanks. Have not encountered this in normal landing approaches, but nowadays I select both for landing with low levels as an undershoot is not a satisfactory option. Suppose you could add a forward outlet port and tee it lower down like some Cessnas, or make a larger gascolator Zenair style as its like a little header tank ( I have the ACS type )

Ralph

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planecrazydld(at)yahoo.co
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PostPosted: Mon Jun 25, 2007 2:27 am    Post subject: 701 unusable fuel Reply with quote
I am not familiar with the 701 but am planning to install a baffle plate withthe one way swinging flap/check valves in my XL tanks. These are used extensively in large(er) jets to persuade the remaining fuel volume to remain inboard.

jetboy <sanson.r(at)xtra.co.nz> wrote:[quote] --> Zenith-List message posted by: "jetboy"

Chuck,

Mine are the same measured at 42.5 litres aside = 10.86 US gal each. I have unported the outlet when running off the tank in nose low and wing down attitudes where the fuel level was lower than 1/4, so I am cautious about feeding off the one side if the level is less than about 12 litres (3 gal) and switch to both for landings. I have cruised on one tank down to 1/8 without problems. The 5 times the engine shutdown were all during manouvers with lots of wing down nose down descent, [quote][b]

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Terry Phillips



Joined: 11 Jan 2006
Posts: 346
Location: Corvallis, MT
PostPosted: Tue Jun 26, 2007 9:17 pm    Post subject: 701 unusable fuel Reply with quote
Chuck

I'm certainly no expert on this subject, but I have read a column by John Deakin that addresses this issue. Deakin's position is that we should all determine by flight test just exactly how much usable fuel is available in each tank of our aircraft. See:

http://www.avweb.com/news/pelican/182044-1.html

It makes sense to me. If and when I finish my 601, I plan to do exactly what he suggests. Deakin seems knowledgeable, thoughtful, and smart. I find his columns great reading. See

http://www.avweb.com/news/pelican/list.html

for list of columns.

Terry


At 03:12 PM 6/24/2007 -0500, you wrote:
Quote:
My 701 ten gallon wing tanks (no header tank) actually hold 10.8 gallons each.

When the nose is low or in a slip the tank fuel outlet can be uncovered if the fuel is too low.

In general, what is the unusable quantity of fuel for the wing tanks in a CH 701, particularly for landing?

Thanks,
Chuck D.
N701TX

Terry Phillips
ttp44~at~rkymtn.net
Corvallis MT
Just starting a 601 kit [quote][b]

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Terry Phillips
Corvallis, MT
ttp44<at>rkymtn.net
Zenith 601XL/Jab 3300 slow build kit - Tail feathers done; working on the wings.
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