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Johannsen tip tanks for the RV6A

 
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recapen(at)earthlink.net
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PostPosted: Mon Aug 11, 2014 5:51 am    Post subject: Johannsen tip tanks for the RV6A Reply with quote
Anyone (else) flying with a set of these? I have them installed and plumbed in as gravity feed (with check-valves) to the main tanks. I know that the HW guys recommend check-valve-pumps to keep the fuel out there and pump it all in at once - I don't remember if they have gauges built in to their tanks - which might be helpful if you only pump a partial

Trying to determine what others have seen as the usable capacity and if there have been any issues with feeding the tips to the mains causing them to dump fuel out the main vents. I have my main vents cut a little shallower than the vents built in to the tip-tanks. I have only used them a couple of times - and only once did I take off with a full fuel load. On a recent flight when I actually used them (full fuel load), I put more fuel in during the refuel evolution than my fuel computer said that I flowed - so I'm thinking I might have dumped some due to over-pressurization. How are your main vents relative to the tip vents?

I need to level the plane, block the outlets, and fill them up to see anyway - but I thought I would try to get some feedback...

Any experiences will be appreciated!

Thanks,
Ralph Capen

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Larry Bowen



Joined: 09 Jan 2006
Posts: 802
Location: NC, USA
PostPosted: Tue Aug 12, 2014 4:19 am    Post subject: Johannsen tip tanks for the RV6A Reply with quote
I have no experience with the tip tanks. But, maybe the capacity of your vent line is less than the expansion volume of your new fuel capacity. Add some more mileage to you vent system. 


2 cents.

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Larry Bowen
Larry(at)BowenAero.com
http://BowenAero.com



On Mon, Aug 11, 2014 at 9:51 AM, Ralph E. Capen <recapen(at)earthlink.net (recapen(at)earthlink.net)> wrote:
[quote] --> RV-List message posted by: "Ralph E. Capen" <recapen(at)earthlink.net (recapen(at)earthlink.net)>

Anyone (else) flying with a set of these?  I have them installed and plumbed in as gravity feed (with check-valves) to the main tanks.  I know that the HW guys recommend check-valve-pumps to keep the fuel out there and pump it all in at once - I don't remember if they have gauges built in to their tanks - which might be helpful if you only pump a partial

Trying to determine what others have seen as the usable capacity and if there have been any issues with feeding the tips to the mains causing them to dump fuel out the main vents.  I have my main vents cut a little shallower than the vents built in to the tip-tanks.  I have only used them a couple of times - and only once did I take off with a full fuel load.  On a recent flight when I actually used them (full fuel load), I put more fuel in during the refuel evolution than my fuel computer said that I flowed - so I'm thinking I might have dumped some due to over-pressurization.  How are your main vents relative to the tip vents?

I need to level the plane, block the outlets, and fill them up to see anyway - but I thought I would try to get some feedback...

Any experiences will be appreciated!

Thanks,
Ralph Capen




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recapen(at)earthlink.net
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PostPosted: Tue Aug 12, 2014 4:32 am    Post subject: Johannsen tip tanks for the RV6A Reply with quote
Interesting thought - thanks!

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