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 Post subject: Re: Introduction - 1947 35 Bonanza
PostPosted: 29 Dec 2021, 22:39 
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Makes sense, I'll see if I can find the records of that. Each tip tank is 10 gals so probably 120lbs total. Thanks again.

Those tips look bigger than 10 gallon to me and AFaIK the only sizes that exist (excluding the experimental "Dolly Partons" are 15/16 and 20.

If you have transfer pumps they're probably D'Shannon, if they feed the engine directly through the fuel selector they're definitely Osborne/Brittain. I'm pretty sure all the D'Shannon tanks were 15-16 gallons each and I think all the Osborne tanks were 20 gallons each.

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 Post subject: Re: Introduction - 1947 35 Bonanza
PostPosted: 29 Dec 2021, 22:50 
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Aircraft: 1947 35 Bonanza
Username Protected wrote:
Makes sense, I'll see if I can find the records of that. Each tip tank is 10 gals so probably 120lbs total. Thanks again.

Those tips look bigger than 10 gallon to me and AFaIK the only sizes that exist (excluding the experimental "Dolly Partons" are 15/16 and 20.

If you have transfer pumps they're probably D'Shannon, if they feed the engine directly through the fuel selector they're definitely Osborne/Brittain. I'm pretty sure all the D'Shannon tanks were 15-16 gallons each and I think all the Osborne tanks were 20 gallons each.


They feed into the main tanks via a pump switch in the cabin so I'm guessing D'Shannon. The placards in the aircraft say 10 gal and so do the ones on the tanks (although one says 12 gal for some reason). I'll drain them completely and fill up to see how much it really is. Maybe the placards are saying how much is usable? Unless the 15-16 gal you're saying is also usable.
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 Post subject: Re: Introduction - 1947 35 Bonanza
PostPosted: 30 Dec 2021, 14:56 
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Joined: 12/10/07
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Location: Minneapolis, MN (KFCM)
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Username Protected wrote:
Those tips look bigger than 10 gallon to me and AFaIK the only sizes that exist (excluding the experimental "Dolly Partons" are 15/16 and 20.

If you have transfer pumps they're probably D'Shannon, if they feed the engine directly through the fuel selector they're definitely Osborne/Brittain. I'm pretty sure all the D'Shannon tanks were 15-16 gallons each and I think all the Osborne tanks were 20 gallons each.


They feed into the main tanks via a pump switch in the cabin so I'm guessing D'Shannon. The placards in the aircraft say 10 gal and so do the ones on the tanks (although one says 12 gal for some reason). I'll drain them completely and fill up to see how much it really is. Maybe the placards are saying how much is usable? Unless the 15-16 gal you're saying is also usable.


I did a little digging and found that D'Shannon's first offering was indeed 12 gallons per side. The ones I had on my E35 were spec'd as 15 gallons each but they held a little more than 16 gallons and all of that was usable.

One of the advantages of their transfer pump design is that all the fuel in the tips can be used without feeding air to the engine. To find out exactly how much usable fuel each tip carries, put in a couple gallons and then run the transfer pump until it goes dry (you can hear the pump speed up when that happens). Then measure what it takes to fill the tip to the brim.
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