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Home✈️Aircraft🚁HelicopterThunder TigerOther › Awesome Mod for Raptor 50 !!!!
01-03-2003 11:33 PM  17 years ago
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Joe Ubaldo

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Grand Rapids, MI USA

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Awesome Mod for Raptor 50 !!!!
After adopting the UNIFLOW fuel plumbing system to solve the “go lean as the tank empties” engine problem on my OS 50 equipped Raptor 5O, I decided to research larger fuel tank options (I like to run my OS50 rich and set up that way, the engine really drinks a lot of fuel). Learn more here:

http://runryder.com/showtopic.htm?s=&postid=164234

The fuel tank solution I came up with was to shoehorn a Raptor 60 550cc extended capacity tank ( PV0310) in the Raptor 50’s airframe. Now I’ve got the longer flight times I was looking for! The extra weight doesn't seem to effect the performance much. That spunky OS 50 seems to handle it just fine.

It wasn’t very tough. All I had to do was the following...

1. break off the plastic tabs at the back of the frame that hold the standard tank in place from underneath.
2. grind away a little plastic on the left back side of the fan housing so the exhaust pressure feed won’t get pinched.
3. grind a notch in the right frame so the fuel tubing wont get pinched as it exits out to the header tank.
4. cut off the drain nipple on the bottom of the 550cc tank and seal it (I used epoxy).
5. cut off the pressure release nipple on the top of 550cc tank, drill out the hole a little bit, insert a 90 degree bend fuel line connector and then attach a small piece of fuel line on it with a clamp to be used as the pressure release.
6. make and insert the UNIFLOW dual fuel line plug for the larger tank.
7. take out the rear landing strut screws, shove the tank in place and then reinsert the rear landing gear screws. It fits just fine!!!!
8. connect your tubing, fill her up and go flying.

Take a look at the pictures below and let me know if you have any questions / suggestions at improving the design.


I hope some of your find this info useful.

Regards,
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01-04-2003 12:18 AM  17 years ago
Vitya

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North York, Ontario

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Thats a huge bi$@! My god what kinda flight times you getting now? 20 min? Very nice, keep up the engineering
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01-04-2003 11:50 PM  17 years ago
Joe Ubaldo

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Grand Rapids, MI USA

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Update....
I flew the hell out of my Raptor 50 today. With the larger tank, I'm getting a little more than 20 minutes of flight time!!

No more worrying about running out of fuel before I'm mentally drained flying it.

My mind runs out of fuel first!!
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01-06-2003 04:42 AM  17 years ago
XLFLYER

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Denver, Colorado and Fort Lauderdale, Florida

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Very nice Joe Ubaldo! The tank looks stock!
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01-06-2003 06:37 AM  17 years ago
RodK

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Laguna Niguel, Ca

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The ability to fly longer looks great. I measured the width of the stock Raptor 60 tank (2 and one quarter inches) and the stock 50 tank (2 inches). How do you get it to fit? Or is the tank you listed a different tank? Let me know, I would like more than 10 minutes flying time.I work to play!
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01-07-2003 12:24 AM  17 years ago
Joe Ubaldo

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Grand Rapids, MI USA

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Yep, it's the standard Raptor 60 high-capacity 550cc (PV0310) fuel tank. Here's how I got the tank in place...

1. I loosened the screws at the rear of the frame holding the two halves together and spread apart the frame about 2mm.
2. I then removed the two screws holding the rear landing gear strut in place.
3. I held the empty fuel tank about 10cm above my kitchen gas stove flame to soften the plastic tank and then inserted (squeezed) it into the opening between the two frame halves. It was a tight fit but it did fit.
4. I then screwed the rear landing gear back in place further compressing the fuel tank from below.
5. Lastly, I tightened up the rear portion of the frame halves.

Prior to putting the tank in, I rounded off all the sharp frame edges (using fine grit sandpaper) where the frame touches the fuel tank. I wanted to get rid of all sharp edges that might cut the tank.

That's how I did it! Let me know if you have any additional questions.
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01-07-2003 12:31 AM  17 years ago
Buzzin Brian

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College Station, Texas

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Thats a V1 50 isn't it? I wounder how it would fit in a V2. Anyone know? Looks great man. I bet it makes for a ton of fun.Build it, fly it, crash it. Repeat as often as needed.
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01-07-2003 07:05 AM  17 years ago
RodK

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Laguna Niguel, Ca

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Thanks!!! That was the info I was looking for. I think I'm going to have to try this. My Raptor 50 is a hungry heli!I work to play!
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01-10-2003 11:33 PM  17 years ago
Axeman

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Auckland, New Zealand

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Joe,

How did you seal the tank after fitting the new big dual fuel line bung?
ie can you use silicon or what??

Cheers from NZ!
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01-12-2003 05:58 AM  17 years ago
MStanley

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W-S N.C

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Looks like with 2 clunks, you are blowing bubbles and foaming your fuel constantly...... ???? Even with a header tank you might have oxygenized your fuel and suck some micro bubbles in the carb since the clunks are so close to each other...

Wondering why you used another clunk instead of the pressure tube thats usually curved up ?? Thats the only thing I would change about it.
Love the idea of the extra fuel supply.......
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01-12-2003 03:34 PM  17 years ago
nickwap

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Berwick-upon-Tweed, Northumberland, England

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Well MStanley, the second clunk is the Uniflow setup

DUUUUUURRRRHHHH
"Give me another one, this one's broke!"
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01-12-2003 04:03 PM  17 years ago
MStanley

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W-S N.C

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nickwap

DUUUUUURRRRHHHH ??? I can SEE that its a UNIFLOW setup ?

Since you are so well informed on the subject, why you didn't answer the question escapes me.

Maybe I don't understand the setup, but it doesn't look right.
HEY, I AIN'T KNOCKIN IT !!!! I just don't understand the plumbing.....

I LOVES the idea of the larger tank and his way of fitting it in.

I know TONS of heli pilots from several states and we have a 2 day Heli Fun fly at our field every year..... BUT, I have NEVER seen anyone using the DUUUUUURRRRHHHH Uniflow setup.... LOL


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01-12-2003 04:20 PM  17 years ago
MStanley

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W-S N.C

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OK, I went back up and read the link to the Uniflow setup.

He never mentioned that 1 ATM is 14.7 lbs PSI and yadda yadda yadda.... LOL

Anyways, if it works then COOL.......
I just don't see any reason for such a complex fuel system when I can simply enjoy the leaning part of my tank doing death launches....

But hey, you never quit learning about Helis and new techniques....
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01-13-2003 01:59 PM  17 years ago
nickwap

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Berwick-upon-Tweed, Northumberland, England

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Sorry it wasn't suposed to sound aggresive
It took me ages to work out uniflow and I still aint so sure why it works !!!!!
"Give me another one, this one's broke!"
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01-13-2003 09:40 PM  17 years ago
MStanley

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W-S N.C

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Hey Nickwap,

No problem.....

Does the pressure line blow any bubbles though ?? Looks like with the clunk UNDER the fuel, it would ???? Just curious... Thanks
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01-14-2003 12:17 AM  17 years ago
Tday

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Needham, MA

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Is uniflow a critical part of this mod or will it work just fine with a regular muffler pressure line?

Tom
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01-14-2003 01:14 AM  17 years ago
Joe Ubaldo

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Grand Rapids, MI USA

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Guys,

This mod does NOT require that one use the UNIFLOW setup. The larger tank will work just fine with the standard plumbing configuration.

I'm using the UNIFLOW plumbing to eliminate the "leaning condition" that occurs as the tank nears empty. I use it on all my birds and the "leaning" is gone!

The UNIFLOW setup requires two clunked lines. The longer of the two fuel tubes is the fuel pickup line that feeds the engine with fuel. The shorter line is the pressure line from the exhaust. They're different lengths so the exhaust gas being driven into the tank is not picked up by the carb side line causing small bubbles to enter the carb.

I used epoxy to seal the tank and now realize the 15% nitro fuel I'm using is eating through the epoxy - turning it black and causing it to crumble, break lose and clog up my fuel filters. I'll have to try some other type of glue / sealant.

Let me know if there are any other questions or suggestions regarding a new sealant option.

Thanks!
Joe Ubaldo
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01-14-2003 08:35 AM  17 years ago
RodK

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Laguna Niguel, Ca

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OS 50 Leaning out near end of tank
I was having the same problem with my OS 50. I had the low needle (screw) opened as far as it would go. Got tired of the OS 50 and purchased a TT50 (on DrDot's recommendation). I am running 3 turns out on the low and high needles and the engine never leans out. I am on my fourth gallon of fuel and the engine is starting to come into awesome power (have not changed needle settings). I can't believe the power. Believe it or not, I haven't flown my 60 in over a month now. Having to much fun with the Raptor 50 with TT50 motor and TT muffler (that is the muffle from the 50 kit). Just curious, is the motor your using a OS 50?

Later
I work to play!
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01-18-2003 01:22 PM  17 years ago
Joe Ubaldo

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Grand Rapids, MI USA

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Yes, I'm using an OS50 SX-H. The leaning problem as the tank empties isn't a HUGE bother but it's a little annoying. The UNIFLOW setup makes the engine performance VERY consistent through out the entire flight. I found it much easier to tune for maximum performance.
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01-18-2003 04:42 PM  17 years ago
davej

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Tiptree Essex England

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Joe try regular silicon sealant clear not coloured I think youll find it ok with fuel.
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