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  #21  
Old 04-20-2020, 05:02 PM
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NorthernRV4 NorthernRV4 is offline
 
Join Date: Mar 2013
Location: Prince Edward Island, Canada
Posts: 138
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Yeah, I know I may never spend much time inverted, or I might. The point is, I won't have to worry about the tank later on in the build. I do also think, some future buyer might appreciate the option too.

In the end, it wasn't that much harder to build the tank this way. Just a few unknowns I had to solve for as I went. Overall, I'm happy with the results.
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  #22  
Old 05-27-2020, 08:58 PM
Phil MacFarlane Phil MacFarlane is offline
 
Join Date: Dec 2007
Location: Northern California
Posts: 11
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Do you need to put in the trap door if you never plan on going sustained negative G ?
Quick builds don't come with them. At least mine didn't.
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  #23  
Old 05-28-2020, 01:12 AM
Phil MacFarlane Phil MacFarlane is offline
 
Join Date: Dec 2007
Location: Northern California
Posts: 11
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While looking for info on the subject I think I found an answer which is good enough for me. Thanks Chad.

"Tonight I was able to work on the trap doors.. It's little things like this that take a long time and you never realize. These guys as I said earlier keep the fuel in the inner most fuel bay in the wing where the fuel pick ups are, so that when you are turning (especially on final) the fuel doesn't run to the outside of the low wing and... ut oh..."
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  #24  
Old 06-10-2020, 03:25 PM
DarinFred DarinFred is offline
 
Join Date: Mar 2006
Location: Columbus, MS
Posts: 79
Default Access plate mount

I’m starting my fuel tanks. For the flop tube install, is there any problem with mounting the fuel sender onto the supplied access plate and installing that plate onto the rear baffle in the second bay? No reason to cut an access hole on the inboard rib, correct? Thanks!
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Last edited by DarinFred : 06-10-2020 at 05:08 PM.
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  #25  
Old 06-10-2020, 04:24 PM
Jpm757 Jpm757 is offline
 
Join Date: May 2013
Location: Sherman, CT
Posts: 794
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Flop tube is worthless without an inverted oil system.
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RV6 #20477 completed 1991 sold.
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  #26  
Old 06-10-2020, 06:04 PM
DarinFred DarinFred is offline
 
Join Date: Mar 2006
Location: Columbus, MS
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I will have inverted oil.
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  #27  
Old 06-11-2020, 07:31 AM
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Snowflake Snowflake is offline
 
Join Date: Oct 2009
Location: Victoria, BC, Canada
Posts: 3,932
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Quote:
Originally Posted by NorthernRV4 View Post
For the trap door(s) in rib #2 I think I"ll rivet a cover plate over the center fuel transfer hole. I think the lower aft hole is plenty to transfer fuel and in this case, I can't see the benefit of the complexity of a second trap door.
Perhaps little value in a second trap door, but there is still value in having that hole. The trap door prevents fuel from running out rapidly when G-forces push fuel to the outside. The trap doors don't seal perfectly so you will get fuel flowing back out, just less rapidly.

However, if the door ever sticks, that's your only way for fuel to get into the inboard bay. The hole in the rib gives you a "backup" that will compensate for this. The flow outboard will be restricted by the size of the hole, but it will retain any fuel below the hole, regardless of whether you're right-side-up or upside-down.
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  #28  
Old 06-11-2020, 09:49 AM
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DeeCee 57 DeeCee 57 is offline
 
Join Date: Sep 2018
Location: LSZF
Posts: 421
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Knife edge flying, I remember that was the reason I built the 2 trap doors in. Well, I was young at the time...

As for inverted flying, matter of taste, I quite like it, looking at the Planet upside down
On the-6 without any inverted system and a carb, the engine keeps running for like 4-5 seconds before quitting. CSP takes over, and the airspeed drops real fast. What ain’t fast is cleaning the spilled oil off the belly and tail... still dripping 2 weeks later
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  #29  
Old 06-17-2020, 04:47 AM
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NorthernRV4 NorthernRV4 is offline
 
Join Date: Mar 2013
Location: Prince Edward Island, Canada
Posts: 138
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Being that the fuel transfer hole in the center of the rib is the same size as the lower one with the trap door I feel that any G's that would cause fuel to spill through would do so in either hole. I decided to cover over the middle hole with a plate. Even if the trap door were to become "stuck" in a closed position, it doesn't seal well, so fuel would still leak through to the inboard bay. I felt the trap door was really there to restrict the sloshing of fuel out of that bay and having the second hole open would negate the purpose of the door.

As for building it, yes it's fiddly and I spent way too much time on making the hinge pretty but I feel good knowing it's so nice :-)

Aerobatic fuel tank by James Soutar, on Flickr
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