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HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityAirstar › Airstar Super Mongoose
03-05-2012 12:06 PM  6 years agoPost 1
rjhpilot91

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somers point, nj

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Here's a couple pics of my mongoose with my new custom made external tanks all done and flying. I had to custom make my own external tanks since I've had nothing but problems with Airstar for the last 6 months getting parts on time or the right parts.

While I was designing my own tanks I decided to completely redesign the fuel system and integrate 2 electric fuel pumps. The stock external fuel tank plumbing setup didn't make much sense to me.

The external tanks and main tank together now hold almost a gallon of fuel and add 9 pounds to the heli ready to fly and full, but it lifts it like it wasn't even there.

Helicopters don't fly, they beat the air into submission!

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03-05-2012 01:42 PM  6 years agoPost 2
kevin39307

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meridian,mississippi

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i use to own the blk tanks from airstar until i sold them to another aistar client who owned a mongoose, but i must say those tanks youve made are nice.

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03-05-2012 04:34 PM  6 years agoPost 3
aboulfida

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Blainville -Qu�bec -Canada

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Very nice job.

8 Mongoose G
2 Airstar jetcat
2 Spectra G
Vario XLV
Bergen GASSER EB

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03-05-2012 09:33 PM  6 years agoPost 4
jtv62161

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Oakdale Pa / Quaker city Ohio / Bradenton FL

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mongoose
Just purchased a orange mongoose from blueboy here on rr its coming ups thursday can hardly wait....I like your retrofit tanks.

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03-05-2012 11:38 PM  6 years agoPost 5
flyboynellor

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Windsor,California

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//

Synergy N5C

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03-06-2012 01:30 AM  6 years agoPost 6
rjhpilot91

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somers point, nj

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I think this was originally one of blue boys helis also. If I could turn back the clock I would have bought a different gasser after all the problems I've had. I thought things were changing when Nick came in but more of the same problems. I hate hindsight.

Helicopters don't fly, they beat the air into submission!

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03-09-2012 06:49 AM  6 years agoPost 7
Scorpion

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Socal USA

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nice goose, can you post pictures of your electric pumps and the plumbing?

I also have the external tanks but I haven't been able to get them to work jet.

when can I get the electric pumps.

Thanks

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03-09-2012 01:16 PM  6 years agoPost 8
kevin39307

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meridian,mississippi

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i have a diagram of the plumbing for the external tanks. see my gallery.

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03-10-2012 12:59 AM  6 years agoPost 9
rjhpilot91

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somers point, nj

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The airstar tanks are okay but there was one major problem, after the main tank drains first into the externals, you have no idea how much fuel is left. The stock setup drains from the externals right to the carb. I didn't like that setup.

Electric pump are from jersey modeler(google search). I think they were about 35 bucks a piece. Mine have a vent line and a supply line coming out of each external tank. The supply line goes to the inlet on the fuel pump and another line dumps that into the main tank. So the carb still pulls fuel from the main tank. It is identical for both tanks. The externals each get filled from a t fitting in the supply line on each side. It seemed a little complex at first but looking at it, it is really simple.

The only problem with this setup is if a pump fails but I plan to keep a backup on hand.

Helicopters don't fly, they beat the air into submission!

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03-10-2012 01:00 AM  6 years agoPost 10
rjhpilot91

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somers point, nj

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Pics

Helicopters don't fly, they beat the air into submission!

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03-10-2012 01:46 AM  6 years agoPost 11
Scorpion

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Socal USA

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Airstar plumbing set up
Kevin, does this set up really work? does the flow go from external tanks to the main clear tank? or how does it flow.

thanks

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03-10-2012 02:21 AM  6 years agoPost 12
GMPheli

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W. Bridgewater, MA USA

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Can I ask a silly question? Why do you need external pumps when you have a pump built into the carb? Can't you just have one tank feed another, just like a header tank on a nitro?

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03-10-2012 03:03 AM  6 years agoPost 13
rjhpilot91

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somers point, nj

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I actually pondered that but the pump has no where near enough pressure to pull from the external tanks way below the engine. Most header tanks are even with main tank from what I've seen.

Also my plumbing from the external tanks to the main tanks goes into the top of the main tank and that is air space at the top. I dont think it would draw the fuel in even with a lot more pressure.

Although I am new to fuel helis so I could be wrong. Oh, and the fuel pumps ensure that exactly the same amount of fuel gets sucked out of both tanks equally, keeping CG right where it should be.

Helicopters don't fly, they beat the air into submission!

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03-10-2012 01:51 PM  6 years agoPost 14
GMPheli

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W. Bridgewater, MA USA

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"I actually pondered that but the pump has no where near enough pressure to pull from the external tanks way below the engine."

How do you know this? Did you try it and it ran lean? Not trying to be a smart arse, just curious. I would think the pump would be strong enough, but I do not know. I see what you mean about both tanks emptying evenly though.

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03-10-2012 02:29 PM  6 years agoPost 15
rjhpilot91

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somers point, nj

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GMP
Youre right I have no idea about the pressure, I was just guessing. The use of the 2 pumps solved the flow problem as well as the tanks draining evenly.

Helicopters don't fly, they beat the air into submission!

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03-10-2012 03:08 PM  6 years agoPost 16
GMPheli

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W. Bridgewater, MA USA

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Thanks! And nice piece of work!!!

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03-10-2012 07:00 PM  6 years agoPost 17
OneHoof

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Cold Spring, Kentucky

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Awesome! How much would you charge to build some tanks like that for me?

Great looking Mongoose. Mine is orange and white. I want to use mine for aerial photography.

SGT V

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03-11-2012 04:56 PM  6 years agoPost 18
kevin39307

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meridian,mississippi

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the setup wrks fine,but i hate that the fuel is drained from the main tank first. by this happening, you have no way of knowing how much fuel is left in external tanks. also i came to the conclusion that if im going to be doing aerial vids, then most likely im not going to be in the air for more than 25 mins at a time. so basically the tanks are a good showcase but id rather be able to fly with less weight.

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03-11-2012 05:46 PM  6 years agoPost 19
clever Heli

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So Cal, CA - USA

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"I actually pondered that but the pump has no where near enough pressure to pull from the external tanks way below the engine."

How do you know this? Did you try it and it ran lean? Not trying to be a smart arse, just curious. I would think the pump would be strong enough, but I do not know. I see what you mean about both tanks emptying evenly though.
I actually built one of these setups for ASI and I tried different configurations. You are right that the pump does not have the capability to create enough suction to pull from the bottom tanks. What happens is the motor will run fine until the main tank reaches half tank, then starts to starve for fuel. Been there, done that.
The airstar tanks are okay but there was one major problem, after the main tank drains first into the externals, you have no idea how much fuel is left.
Actually you do have an idea, use the timer on your radio. The Jetcopter uses these same tanks without the plastic tank the Mongoose has. So you just need to know how long you can fly and set your timer.

You did a great job and it looks great! I'm always looking for ways to decrease the weight as they do fly better the lighter they are. I stay away from the generator setup just because of the extra weight factor. The electric pumps mean more weight and battery source, unless you are using the main battery. But if it gives you peace of mind to see the fuel in the main tank then it makes it worth it. Once again, very nice job.

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