hello gents!

i have one big 3 liter tank on a jet....

i plan to use the bvm uat before the turbine but still

while flying i think i will fill it with air!\



to avoid flame out can i place a secont hoper tank ...how about two uat s in line?!???????
do you think they can work together?


thanx guys in advance for any replyies[8D]

you don't want two UATs in line together, any air that gets to the last in line will only be pushed to the second in lines intake side and not be purged out during a refule.

One works great....all you need.
Lee

Why do you think the UAT would fill with air while you are flying ?

If you think you will have UAT air problems, you do not need another UAT. Any other tank in line between the UAT & the main tank will do the job.
An additional UAT could present other problems due to having to pull the fuel through two filter sacks.

KISS will pobably work best here.

Multiple connections = more chances for air leaks to form.

FWIW I use a very simple setup where the clunk in the tank is made from a fuel filter and the line goes directly to the pump. Super simple and I don't need to purge anything. Can't tell if it's better than a UAT since I don't seem to have too many flameouts

hello guys!!thank you for all the replyies and your time!!

Gordon becouse of one big (3liters)long flat tank i think the long tygon inside will be out of fuel in every dive of mine suking only air in the tank and not fuel! so uat will quicly get air...

...maibe ill use another small tank betwin uat and main...hoping to feed engine and uat until dive finish..

my promblem is the tygon line if not the shape of the tank...becouse is not very elastic!

do you think a neopren line would chace fuel better in the tank or ill get any new promblems!??

...can a jet cat pump colaps the wals of a neopren line on full throtle...you think i should avoid it?

if the risk with a long neopren line would be the line to close from tite angles inside how about using this arount the line to avoid that hapent:

http://www.dreamworksrc.com/catalog/...oducts_id=1452


thanx guys!....forgive my bad english[8D]

You can use a 16 oz between the UAT and the main tank. This smaller tank should be able to have the clunk inside fuel at all times.

when you are in a dive, physics will keep the fuel at the back of your tanks. no need to worry.

sir im not axxelerating in dives!"proper throtle managment ".i free fall! but even if my speed was steady the airframe has airdrag that fuel in tank has not!so fuel wil fall faster than my airframe in space becouse of less airdrage but also better aerodinamic shape!

so there is a very big need to worry!thank you for your time also!

so ill try to fit a smaller tank then !

maybe you have any sugestions where the open of this tank must be....upright for better feed on dive??


thanx guys!!

I saw a setup one time that the guy had taken a simple soda straw and placed itover the fuel line about an inch from each end and it kept the fuel clunk from falling forward. dont know if that would work here...just a thought.

thank you for your thought!this way we work thinks out!!

ill throw on the table another thought!...maybe a manufactor would interesting on that!

for me the best solution would be a secont line in the tank fron the oposite side!

this also would add with Y to main line and a gravity working valve would chouse which line will feed the uat?!?

how about made a valve like that!?

just dreaming loud....take care friends

sorry for my bad english..

dam!that came out big![X(]

no offence but that looks like a fuster cluck dieing to fail.

This device is just what we need....more complication!!!
Fuel doesn't fall faster than your airframe in space because of less airdrage (air drag) or better aerodinamic (aerodynamic) shape, unless Sir Isaac Newton was full of crap.

Harley that was just an idea!sorry for thinking out loud...

also forgive my english..i guess your Greek are better than mine also??

regarding fuell fall faster than airframe ....is liquid shape more aerodynamic than a shape of any airframe or not??so let me refrace

fuel will not fall faster generaly...but airframes fall slower compare to fuel becouse of wors shape???maybe im wrong!


....kc36330 your post never show to offence somone.so there is no reason for mention...
i also think this is complicate.

but most of are jets are. and complicate doesent mean necesery fail point..


anyway im adding betwin main tank and uat another smaller tank in a try to hold back air from uat...

in 8 min of flite and diving with idle throtle i dont think ill have a promblem.


take care friends...

Nominee for quote of the week!

G force is a funny thing when it comes to fluids. when we have a paint stirrer fun fly quiet often we use an event where we rubber band a cup on top of the plane, fill it with water and then you take off, do a loop during the pattern then land, we then measure the remaining water in the cup for ranking, you'd be right surprised at the amount left after some pretty screwed up looking loops dips and dives. try it next time you're out flying.

...i totaly agree!! but what hapens when in dives you go idle throtle?!?...so free fall...no g's...


thanx for your time posting!

its good to have anotheer opinion

No George,
My Greek is not better than your English.
I don't pretend to speak Greek, however.

Don't forget about gravity....you can never be in free fall because of it.

Who was it that said" There is no gravity....the earth sucks"?

If you are really concened with keeping air out of your header tank then a smallish tank, with clunk feed, between the main and hopper works perfectly . Proof of the pudding : I have two Bobcats one a standard with just two tanks plus a UAT. There is always some air in the UAT after an aerobatic flight. In my other Bobcat, an XL, there is a supplementary tank with a clunk, and this acts as a collector and a primary air tank. Result is there is never any air in the UAT on this model after an aerobatic sortie, the intermediate tank has collected any air and does not allow it to pass to the UAT as the single weighted clunk stays submerged in fuel.

MY BVM F4 which has two parallel tanks also has a 16 oz intermediate tank with clunk which feeds the 6 ounce hopper (not a UAT) and there is NEVER any air in the hopper after an aerobatic flight, any air stays in the intermadiate tank and the clunk always stays in the fuel. Problem solved, and in almost 500 flights between them not a single fuel related flameout !

Regards, David Gladwin.

Who was it that said" There is no gravity....the earth sucks"?
[/quote]



LOL

lol...best reply for this post friend!

Henk i think you must add"all rights reserved" too! lol


David thanx for the feedback!

yes i agree adding a 16oz tank will keep thinks good for my 8 minute flite!

thanx frieds for calming my woryies

take care

...gone to build![8D]

George

Follow David's advice its based on sound flying experience. By having a full intermediate tank its possible to bunt, cobra, flick, neg G, inverted spin or any flight path you might fly. I wouldn't patent the drawing LOL thats just too complicated when the answer is so straight forward.

Paul

Hey Paul!...yes this is the way to go!

in the smaler tanks my consern always was the tygon tube short lenth not be very elastic to chase fuel arount in small lenth tanks..\\

please gents one last question just came up!...i ask cose maybe i do thinks whrong from the start!...and out here i dont have any experts ...

..in tanks i always use fuel line litle sorther than tank... draw A

do you think a shorter lenth line like 2/3 of tank would prodive beter move? drawB


thanx guys!