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Thunder Power RC ProModeler
Gearhead

rrMaster

Vt

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Carey

1)
so how come the RR Gasser guys and the HF Gasser guys are not up on this LOL

2)
the Gasser Boat guys say they have found smoother running and more power with the Walbro Barrel type Cabs, have you tried one yet ???

I can see why they say "smoother running and more power", it seems to me that the Barrel would flow air more smoothly and more uniformed than a Butterfly Plate would

http://www.arrowshark.com/WYK-33.php

http://www.gizmomotors.com/index.ph...ependent-detail

Jim
Buzz Buzz Buzz

07-08-2016 07:33 AM
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jharkin

Senior Heliman

Holliston, MA - USA

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Looking at this, I have a few thoughts.

The biggest benefit I could see is that being a barrel carb its going to have a more linear throttle response, more like a glow engine than a gasser. So if you are using throttle curves you are back to more of a V than a deep U. I could imagine that it might improve governor response as well and allow more nitro-centric governors to work OOTB without lots of fiddling.

I dont know if its going to make a meaningful difference on max power. Hanson (and I would suspect also TRM) is already boring out the venturi on the carbs with the 300 mod motors, there is only so big you can make it before you get into poor idling issues, etc.

Against the benefits, looking at the pictures (especially the arrowshark page) I see a LOT of work would be needed to make it fit a heli.

#1 - Biggest problem is the throttle arm is in the wrong place. You are going to have to either make an adapter to rotate the carb, or else make new frames that move the throttle servo or setup some bellcrank linkage.

#2 - It uses an external pulse line like reed valve engines in planes typically use. Not a huge deal but you will need to tap the case for a pressure fitting.

#3 - Its physically much larger. We would have to test install it on some popular helis to know if this is going to cause fit issues.

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

07-08-2016 12:26 PM
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Carey Shurley

Elite Veteran

Orlando, FL - USA

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no haven't run a barrel carb

different carbs have different fuel mixing at different air flows so just because it may (or may not) have a more linear response, it may perform slightly better or worse.

look at the walbro 1052 that was supposed to replace the 990. Just doesnt work properly in a helicopter

If you're not flying a gasoline helicopter
You're paying 10 times too much for fuel!!

07-08-2016 01:25 PM
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RM3

Elite Veteran

Killeen, Texas - USA

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boat guys dont have to worry about vibrations either so for them the term "smooth" has a whole different meaning.

also, boat guys run into the 20K rpm range...way over what we normally run...theres a big difference between a 3 inch prop and a 5 foot rotor span.

ever see how some of these engines are mounted?...notice the four 3/4dia rubber mounts? obviously not "smooth" enough in a model that doesnt even use a gyro

showing a preference will only get you into trouble, 90% of everything is crap...

07-08-2016 02:58 PM
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Chris Bergen

Elite Veteran

cassopolis, MI USA

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What works great in a boat (or car) application won't necessarily work great in a heli application.

One should certainly TRY it, maybe many people should try it just to get a good cross section of results, but it's very rare indeed to find a magic bullet that suddenly transforms what has been working very well to this day..

Give it a try Jim, on your Dime and Time, let us know your results..

Chris D. Bergen

07-08-2016 06:46 PM
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rbort

rrProfessor

Franklin, MA - USA

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Good idea but...

Give it a try Jim, on your Dime and Time, let us know your results..
With what, does he even still have a gasser? Last I know it was one years ago, a Radikal G20 which is not the same motor or carb anyways that most of us use...

-=>Raja.

MA 1005 Hanson 280, 4038 flights
Raptor 90 Hanson 300, 267 flights
Spectra-G G270 3DMax, 3110 flights
Whiplash-G G270 3DMax, 1270 flights

07-08-2016 08:03 PM
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RM3

Elite Veteran

Killeen, Texas - USA

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now, .. now... lets not start this $hit again...

I for one have tried lots of crazy ideas thinking maybe a tweek to an original idea would solve an issue...and still trying in some cases (and on my own last few dimes BTW)

maybe, just maybe someone should try one...just in case.

showing a preference will only get you into trouble, 90% of everything is crap...

07-08-2016 10:30 PM
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Gearhead

rrMaster

Vt

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sorry, I wont try it on my 20, not now, it's all perfect right now

sorry RM3 I don't see your point, the Barrel carb will surely produce smoother air flow

Jim
Buzz Buzz Buzz

07-09-2016 02:22 AM
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oldfart

rrProfessor

Vancouver, Canada

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now, .. now... lets not start this $hit again..
+1
I for one have tried lots of crazy ideas thinking maybe a tweek to an original idea would solve an issue...and still trying in some cases (and on my own last few dimes BTW)

maybe, just maybe someone should try one...just in case.
So have I over the many years I have enjoyed this hobby, tweeking has always been part of the attraction to this hobby, specially with gassers.

I think a lot of improvements over the years have initially come from trying things using our own dollars.
sorry RM3 I don't see your point, the Barrel carb will surely produce smoother air flow
I think he is just encouraging anyone who might want to give it a try.

Phil

07-11-2016 01:09 AM
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RM3

Elite Veteran

Killeen, Texas - USA

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the Barrel carb will surely produce smoother air flow
smoother airflow does not equate to smoother running...might get higher rpm capability at WOT but I wouldnt expect to see anything drastic over what is already out there... it would have to be enough difference to justify the additional weight and linkage to fit it.

you really need to test this big venturi carb on a 30cc or bigger engine to see any gain over the big walbro butterfly carbs already out there...if any.

for me I was hoping for the fuel injection system that evolution put out last year...and sadly it didnt pan out....unreliable, heavy, power hog with little to justify over the traditional carb...

but at least new stuff is always coming out to play with.

showing a preference will only get you into trouble, 90% of everything is crap...

07-11-2016 03:58 AM
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Gearhead

rrMaster

Vt

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smoother airflow does not equate to smoother running
do not agree

Jim
Buzz Buzz Buzz

07-11-2016 04:19 AM
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