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HelicopterGasser Model RC HelicoptersOther › Gasser overheating issues?????
06-06-2004 04:16 AM  13 years agoPost 1
duczz

rrApprentice

Kerikeri, New Zealand

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Hi I am yet to own a Gas heli, but am about to get one, just curious to the overheating issues that I have read on this site, If gas heli's are susceptible to overheating, why dont chainsaws and scrub cutters seem to have this problem? especially considering that they are often enclosed and dont seem to have any kind of cooling fan like a heli does, I would have thought that overheating was not a problem with a gas heli, any ideas explanations would be appreciated. Cheers

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06-06-2004 05:11 AM  13 years agoPost 2
AGRAV8

rrProfessor

Mosquito Coast......Houston Texas

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Cheers!

Some gas powered heli's do not have a fan system that is able to dissapate the heat as well as others. This is one consideration.
Some gas heli's do not have a gear ratio that is suited to optimum torque and power output at a given headspeed. Versitility with gear ratios can solve that issue.
The other small 2 stroke engines you refer to do in fact have a fan on them to aid in cooling in most applications.

Now, to the real, more menacing issue......tuning.

When we fly a model helicopter, we optimize the tuning to get the engine to run as lean as possible without damage so that it runs CONSISTANT......and the tail doesn't jerk nor do we "bog" at high power demands. We also require a smooth transition from partial power to full power.......and back again. On other applications, the engines are typically run very rich in comparison.....and this helps keep the overall temperatures lower in a given power demand cycle.

There are a few other, less important factors to consider, like duty cycles, idle/full throttle operations and cooling fin area.

Hope this helps. I would choose a machine that has a very good cooling fan system on it, as the other variables are not very easy to manipulate in a model helicopter.

James

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06-07-2004 06:32 AM  13 years agoPost 3
Fullagas

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Michigan

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.
Not a problem, unless you run too lean.

The early X-Cell gassers (one of which I have) did have a spotty record with overheating, in part due to the fan design (since changed), and the fan shroud (also changed/improved). They run just fine now.

You have many fine ships to choose from, that's the only real problem.


.

Flying helis since gyros had springs.

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06-07-2004 07:36 AM  13 years agoPost 4
AGRAV8

rrProfessor

Mosquito Coast......Houston Texas

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You have many fine ships to choose from, that's the only real problem.
I agree totally. The latest generation of machines are making themselves very desireable to pilots that would not have been in the market before.....

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06-20-2004 06:35 AM  13 years agoPost 5
duczz

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Kerikeri, New Zealand

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Thanks Guys, i have gone and bought a Robbe Cuatro, with the gas conversion kit, cant wait to get this thing in the air and experince some of the benefits of running on gas instead of glow.

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06-20-2004 11:14 PM  13 years agoPost 6
wolfdad

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Southern Maryland

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A lot more desirable to this pilot. I am saying adios to the glow side and sticking with either turbine or gasser. Just ordered my first gasser and am anxious to start into new territory. From what I have read and heard and experienced with my turbine, I am firmly convinced that turbines and gassers are the way of the future.

wolfdad sends.....

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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06-21-2004 12:25 AM  13 years agoPost 7
Gary Travis

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Utah

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Wolfdad

You are going to love the gasser, I don't even have the desire to fly glow anymore. The myth is you need a glow to fly 3d or due to the weight of the gassers. One must keep in mind the power to weight ratio. The gassers on the market todat will pretty much do what you want them to. I have also heard that they are expensive to repair, well have you repaired a high end glow latly? I love the Bergen gasser, I either fly that or my turbine.
Gary

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06-21-2004 05:31 AM  13 years agoPost 8
JBSQUIRREL

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Earth

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Gas, Gas, and more Gas

Nothing but a Bergen Intrepid! Power to weight...unbelievable!

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06-21-2004 06:39 AM  13 years agoPost 9
helidog

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usa

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What is the weight of the Bergen Intrepid "ready to fly less fuel that is"?

Its nice to be the Big Dog.

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06-21-2004 07:46 AM  13 years agoPost 10
JKos

rrProfessor

Redondo Beach, CA

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> What is the weight of the Bergen Intrepid "ready to fly less fuel that
> is"?

I'm interested to hear some numbers on that.

My just completed Predator Gasser weighs in at 12 lbs 6 oz ready to fly less fuel.

- John

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06-21-2004 11:08 AM  13 years agoPost 11
wolfdad

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Southern Maryland

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I understand somewhere in the vicinity of 13 lbs. give or take. Does that sound correct?

Gary, as you are well aware, I have had the mis-fortune of finding out both what a Vigor and Voyager 50 can cost to repair. Nothing against JR (they make a fine product and I will always be a JR fan), however my average "cost to repair" on the 3 Vigor crashes I have experienced this year has been in excess of $400 per and the Voyagers (due to the intensity of the crashes) have been over $500 per (that includes the IMZ which was beyond economical repair and that drove the average way up). So, I am extremely well versed in crash costs (hell, Heliproz has me listed as a single line item on their quarterly profit projections) and, I am sure that crashing a gasser is not cheap and, if I crash glow aircraft, I will probably follow suit with gassers, however it is the constant, incessant, peak this or tweak that that is causing me to became a "gasser convert." A perfect example of what I am talking about and, the "straw that broke the camel's back" happened yesterday morning.....a perfect morning for flying....temps here in Maryland in the 60's and 70's, light winds, bright sunshine....a day made for flying. I get one flight out on one of my recently repaired Vigors and get ready to start out on my second flight and the GD OS .91 is hydra-locked. Two cans of "whup-ass" in addition to a "Schwartzenegger" 60 volt, guaranteed, ultimate starter could not have turned that prick over. And, as many of you know, if you have equipped a Vigor with a remote glow adapter, you have to pull the MF'ing shroud to clear the engine and, that for me, is about a 30-45 minute evolution. NO WAY, this time around! I kicked back and watched my flying partner "do his thing," just counting the minutes until I could get home and get online and order an Intrepid. By the way, my flying partner promptly pulled his Vigor into a 20 foot hover, inverted his machine and performed one of the most beautiful inverted climb-outs to about 300 feet I have ever witnessed. Getting back to the subject at hand, though, I got home and promptly did two things...one, I called ARGT to let him know and then ordered my Intrepid gasser.

Something just clicked when that .91 (I am fast getting over the disease of being an OS fan) hydra-locked (how come they can't put a compression release on these motors....they do or used to on motorcross bikes). So, instead of climbing up in a tower and shooting people, I came home and spent money instead....and this time for a gasser. $2.00 per gallon and executing a manuever that I am well-trained for (the old "starting the weed whacker" manuever) plus the advice of several well-informed friends just over-whelmed me (the devil made me do it) and I bought an Intrepid. Throwing a can of gas, my helicopter, my wife and my radio (not necessarily in that order and certainly not litterally throwing) in the truck and heading for the field (sans starter, batteries, glow igniter and the other 65 lbs. of glow GSE that is required) just instantly appealed to me. Oh, and the recent onslaught of MPII problems with which I have also been aflicted didn't hurt either.

Sorry to be so verbose on my first entry into this forum, however I had to vent. I pissed away a beautiful flying day because of "glow power," sold an unfinished Tempest FAI bird, complete with a cancerous OS-.91PS and am now a "gasser convert." Too old for 3D, too lazy for the constant peaking and tweaking of glow engines, and too into scale to continue down the glow road. So keep your eyes open for the reasonable sale of 5 Vigors (3 CS and 2 standards) and standy-by for my entry into the gasser world. Gassers and turbines are my future (dang, I waited a long time to become a jet pilot and ADR again....those of you with "old Navy" experience will appreciate the ADR thing).


wolfdad sends....

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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06-21-2004 01:35 PM  13 years agoPost 12
Gary Travis

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Utah

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Wolfdad

The gasser will be a pleasure for you to fly, I beleive you will enjoy the stability and power. I can tell you that mine with the 260puh has power to spare. Just don't let the weed wacker experience get in the way. The wife will get pisser if you decide to trim the garden with an inverted gasser.
Gary

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06-21-2004 02:56 PM  13 years agoPost 13
wolfdad

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Southern Maryland

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Gary,
Just got off the phone with Larry and I can't wait....told him if he could, to have it to me yesterday.

wolfdad sends.....

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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06-21-2004 05:03 PM  13 years agoPost 14
shawgl

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Murrieta, CA

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He ain't lyin

I saw the anger yesterday morning, I got a hell of a deal on a FAI Tempest though. I need to buy that OS 91 a beer!!! We'll see if it can convert me when Doc gets it in. You never know!! But the question is...... Doc...... Do you think it can keep up with the CS in an inverted climbout? Are you also willing to chase buzzards with it? I am!!!!

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06-22-2004 03:31 AM  13 years agoPost 15
Chris Bergen

rrElite Veteran

cassopolis, MI USA

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Weight of the Intrepid Gasser

Here is a link instead of going throough the whole thing again!!

http://www.rotorworks.net/viewtopic.php?t=17

We discuss the weights of the different gassers.

Chris D. Bergen

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06-22-2004 04:19 AM  13 years agoPost 16
Billme

rrElite Veteran

MS

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Way to go chris, hehe

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