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1/2A Nut's

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New Cox Fuel Tank?

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Re: New Cox Fuel Tank?

Post  1/2A Nut on Thu Apr 14, 2016 3:31 am

Mine holds 5g of fuel so 7.2g ready to roll. Cool

WTG a micro tank is born!!! Very Happy What size tank is that a 10cc?
Have you done a weight check with fuel?

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Re: New Cox Fuel Tank?

Post  stevej on Thu Apr 14, 2016 4:58 pm

If you need really soft flexible silicone tubing for a clunk you might try the stuff we use on free flight timers. From Texas Timers- http://www.texastimers.com/
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Re: New Cox Fuel Tank?

Post  1/2A Nut on Thu Apr 14, 2016 7:59 pm

Thank you Steve,

Thin walled tubing is a bit of a risk as I bury the tank for the life of the plane my tanks are used as former's and control the width of the fuselage. I glue the two fuselage sides to the tank then add the fire wall then pinch the back of the fuselage together add bottom sheeting with thick gap filling CA then add the top deck
there are no other former's. I use think ply 1/32nd on the sides and 1/64th on the top and bottom makes for a very strong smack proof light weight platform for the flying surfaces.

Today I put together another tank the 10cc weight is a bit less all around.
Long and narrow wish I had one on hand with the Lil Speedy build could have
gotten by with a faster lighter fuselage.








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Re: New Cox Fuel Tank?

Post  MauricioB on Thu Apr 14, 2016 9:57 pm

Hi, sorry to interrupt the post, but I wanted to ask if this video is yours.
Please be very useful to inform me as he made the basket speed control, very grateful!..Mauricio.-

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Re: New Cox Fuel Tank?

Post  1/2A Nut on Thu Apr 14, 2016 10:08 pm

Bagged up and taunting me to build new planes, nice to know I am ready to go upon a whim.
There are some small rubber stoppers for test tubes but the weight is more then twice of
what simple cork can provide.

Yes I made that vid under Amp Abuser just file or grind the skirt off the bottom of the cylinder and slip over
a DIY ring type throttle sleeve. Take your time and be careful not to mess up the threads.
Steel or aluminum tube will work the aluminum will seat in with a good fit to keep the weight down.
Will idle great and give you a simple way to fly 3ch Micro's TD .010 planes. Do not match the cylinder
exhaust ports your throttle sleeve ports will have to be a bit smaller length wise for it to idle well.

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Re: New Cox Fuel Tank?

Post  MauricioB on Thu Apr 14, 2016 10:33 pm

Hello, I do not understand your message, it is directed to me?
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Re: New Cox Fuel Tank?

Post  1/2A Nut on Thu Apr 14, 2016 10:56 pm

Two messages one about the fuel tanks and second paragraph is a response to your question about the throttle sleeve.
Very Happy
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Re: New Cox Fuel Tank?

Post  MauricioB on Thu Apr 14, 2016 10:58 pm

Sorry I do not speak English management by google translator. My question is if I offended him at some point?
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Re: New Cox Fuel Tank?

Post  MauricioB on Thu Apr 14, 2016 11:21 pm

ahhh agree now understand !. Can you put photos of the 010 rim regulation, could you tell me how to make one?... Very Happy
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Re: New Cox Fuel Tank?

Post  1/2A Nut on Fri Apr 15, 2016 6:15 am

Source:
9.3mm ID External Circlip
http://www.hjfasteners.com/product.asp?bascode=107&classcode=107102


K&S 10mm OD thick walled aluminum tube

10 x .89mm Heavy Wall Aluminum Tube from K&S Engineering.:
http://www.hobbylinc.com/htm/k+s/k+s9812.htm

Product Specifications
Length: 11.89 (302mm):
Diameter: 0.39 (10mm):
Hole Diameter: 0.29 (7.5mm):
Wall Thickness: 0.035 (.89mm)
K-S Product Number: 9812


Note OD of the cylinder is 8mm you will need to remove a hair
worth of the inside wall of the aluminum tube to slip into place
be patient and lap it in carefully for good fit. You can choose
to remove the black coating off the cylinder to speed up the fit.

Again, you must remove the skirt, file off carefully to avoid damage to the cylinder  threads.

File or turn a shallow 9.75 mm OD groove for the Circlip to rest in.
You will need a snap tool or flat head screw driver to expand it out
over the 10mm OD tube and slide into place.

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Re: New Cox Fuel Tank?

Post  Levent Suberk on Sun Jul 15, 2018 11:23 am

1/2A Nut wrote:Here you go did up a 5cc for the TD .010 will give 4.5 to 5 mins of run time same tank size that's
in the 42k rpm  NANO. I seal the inside cork wall with thick CA to insure no loose bits float into the
tank and the fuel line does not come loose inside the tank. Press fit into place with a final seal on the
outside to insure no leaks and help support the cork. Life time of tanks for under 15 bucks shipped.

I have done a handful of these now this way and no issues even after smacking / crashing the plane.
Use IV drip line type tube for the inside curve line, heat up a bit and shape the curve once cool it hardens and
holds it curve for life. Fuel flow and 2.2g weight is excellent! This lil duration tank is one and done in 15 min.
Small Cox Logo











Sorry for bumping an old thread, but I want to ask that is gap filling CA dissolve in fuel? I did not use gap filling CA any yet.

Can I use RTV silicone (silicone rubber) instead of CA or epoxy glues against fuel leakage in long term use? I use %16 nitro fuel.
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Re: New Cox Fuel Tank?

Post  pkrankow on Sun Jul 15, 2018 9:53 pm

Nitro dissolves CA pretty quick. Even 5% can dissolve CA if it is flooded. For assembling wood to wood this is normally not an issue even with ocassional fuel exposure as only the oil will stay in the wood.

With constant fuel exposure silicone rtv is pretty tolerant of nitro.

Phil
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Re: New Cox Fuel Tank?

Post  1/2A Nut on Sun Jul 15, 2018 11:53 pm

Hi Phil that is old pics from early testing mind you the tanks built with the pressed in
compressed cork are still working just fine and fly routinely in the NANO IV and
NANO II projects.

No leaks to date, however I have upgraded my tank designs using rubber stoppers
that require no sealing other than some heat shrink to keep the bung from migrating
from engine vibration etc. They are press fitted in place after drilling two holes for the
aluminum feed tubes. Here is a nice pic of the tank collection sizes I make now.



If anyone needs some tanks shoot me a message, I sell them ready to install.
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