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General control line discussion => Open Forum => Topic started by: big ron on March 18, 2015, 09:54:53 AM

Title: Vector 40 arc tank
Post by: big ron on March 18, 2015, 09:54:53 AM

Have a Brodak Vector 40 ARC going to be using fp40 would like info on what tank to use and any other recommendations

Thanks

Title: Re: Vector 40 arc tank
Post by: Gerald Arana on March 18, 2015, 10:21:32 AM

4oz. uniflow would be my choice.  y1

Jerry

Title: Re: Vector 40 arc tank
Post by: peabody on March 18, 2015, 01:10:20 PM

Brodak lists a 4 ounce "Magnum" tank...it's Uniflo and fits the Vector well.....you will still need to use something to keep the tank up against the floor of the mounts....

Title: Re: Vector 40 arc tank
Post by: Bill Little on March 18, 2015, 01:42:37 PM

I think we are using the 4 1/2 oz Brodak Magnum tank.  Seem to burn more fuel around here!

Depends on engine, too.

BIG Bear
RNMM/AMM

Title: Re: Vector 40 arc tank
Post by: Don Chandler on March 18, 2015, 01:55:42 PM

I have a 4 oz uniflow in mine and works well.

Title: Re: Vector 40 arc tank
Post by: Brent Rogillio on March 18, 2015, 02:46:29 PM

how can you tell if you have a uniflow tank. it looks like the same tank brodak sells but i want to be sure. thanks Brent

Title: Re: Vector 40 arc tank
Post by: Dennis Moritz on March 18, 2015, 05:46:09 PM

4.5 minimum. 5 ounce if it fits. 4 ounce is marginal. Probably barely do the pattern with 10 per. Depends on how much power your Vector needs. It will vary. Weights range. Depends on engine tune. Prop Venturi head gaskets.


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Title: Re: Vector 40 arc tank
Post by: Dennis Moritz on March 18, 2015, 05:49:00 PM

I know a vector ARF with an fp35 small Venturi. Will not finish pattern on 4 ounces until the weather heats up. That on 5percent. 10 means less mileage.


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Title: Re: Vector 40 arc tank
Post by: Randy Cuberly on March 18, 2015, 07:02:39 PM

Dennis is right.  4 oz is not enough.  In the event that you need more power and need to add nitro or a larger venturi to get it you will not finish the pattern on 4 oz.  If you can fit a 5 oz tank use it.  I would even question whether 4.5 oz is enough under some circumstances.

If you go to a contest in an area where tha altitude is high and the temperature and humidity is high an FP40 will be a marginal engine in a Vector.  More power will require more nito and possibly a larger venturi for those conditions.  Those items can raise fuel consumption dramatically.  Few things are worse than running out of fuel in the overhead eights or at the top of the clover leaf.

Bottom line...never build a stunter with marginal properties for varying conditions.  It always ends in tragedy and disappointment.

I would reccommend an LA46 instead of the FP40 in reality.  At some point you might want to make that conversion and then the 5 oz tank will be a must.

Never design to fail!!

Randy Cuberly

Title: Re: Vector 40 arc tank
Post by: john e. holliday on March 18, 2015, 08:55:15 PM

Put in the biggest tank that will fit.   You can always take out fuel, but you can't add fuel if you don't have room.  Also make tank removable so if you do get consistent runs on a certain amount you can change tanks.   Also allow for vertical adjustment. My 2 cents worth.

Title: Re: Vector 40 arc tank
Post by: Balsa Butcher on March 18, 2015, 10:08:03 PM

I built a Vector awhile ago. If I remember correctly the largest tank I could get to comfortable fit was a 4.5 ounce magnum uniflow. The advantage of this type of tank is that the vent and overflow tube come out the bottom and run up the side of the fuselage. The Vector cowl is set up for this. This is the one I would use, available from Brodak. Hint: If you go this route apply JB weld to the tube/tank interface at the bottom of the tank. This will absorb vibration otherwise there is a good chance the solder will crack there creating a leak.  8)