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HomeAircraftHelicopterGasser Model RC HelicoptersOther › New Generation Gassers
02-10-2006 02:31 PM  12 years agoPost 121
revman

rrApprentice

Leicester UK

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fly wheel inertia
Ok maybe Im wrong but i figure a good gasser heli engine should have a reasonable fly wheel mass to help with those sudden load changes , that gives the govenor an easier time and the illution of having more torque. these small gassers will then have almost no fly wheel and this is the reason our zenoahs have so much grunt. fixed ignition is ok as we run either idle or at a constant rpm, or should so acceleration not a worry . Many high rpm strokers need to retard at full rpm to avoid detonation.
Thats my 2 euros anyhow.
Also i wonder on the cooling as there is no internal cooling like with methanol....... bigger heads or fans?

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02-10-2006 02:46 PM  12 years agoPost 122
shuttlepilot

rrElite Veteran

Mullins, South Carolina

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When I talked with BME on Thursday, they indicated that the .51 will probably have to run on a 32:1 oil ration instead of 50:1. They thought that would help with the cooling of that engine, but they were still in the testing stage on it.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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02-10-2006 02:59 PM  12 years agoPost 123
Franconia2

rrNovice

Shrewsury, MA

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Engine Mount
I received the G90 yesterday and started to fit it in an X-Spec. It appears to be a fairly straight forward install with the exception of the engine mounts.
Are there any "blank" mounts available that can be used to fit this engine? I plan to go to a local shop and have some made up but would rather try an off the shelf product to start.
Plan to use a 12T pinion and 93T gear.

Keith at BME suggested a 32:1 oil ratio rather than 50:1. The extra oil will provide more cooling and better protection when running at 14000 rpm. They run this engine at 12000 on planes at 50:1.

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02-10-2006 03:49 PM  12 years agoPost 124
Flying Tivo

rrKey Veteran

Monterrey,NL,Mexico

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GAS or Naphta
Franconia:

Would you be using regular unleaded gas or Naphta and what oil?
Please if you can document with pictures your progress. It would be nice.


My worries are that a walboro carb would be difficult to fit into a raptor airframe and it would kill some of the cooling from the engine. A regular Carb like Webra is a plus for me. Also if you feel the ignition system is a little overweight you can choose a generic one half the weight with varable timing and less power consumption, they are available on RCUniverse.

Can you imagine a Raptor 60 with an onboard generator feeding the ignition control and servos.

Thanks
Felipe

If life throws at you lemons......Squirt some lemon juice in the eye of your enemy!!!!

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02-10-2006 05:54 PM  12 years agoPost 125
Felino

rrApprentice

Mexico city

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Quote: The 2300 will be in a .90 sized case and have the same fitment needs.

I don`t undersatnd that. I have never seen a Super Tiger 2300 engine, but having more cubic inches,(if I`m right) I think the case must be a lot bigger than a regular .90 engine.

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02-10-2006 07:05 PM  12 years agoPost 126
Tanager

rrApprentice

El Monte, California

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The cylinder is larger, but the case is the same size as standard .90's.

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02-10-2006 07:11 PM  12 years agoPost 127
Tanager

rrApprentice

El Monte, California

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Ok maybe Im wrong but i figure a good gasser heli engine should have a reasonable fly wheel mass to help with those sudden load changes , that gives the govenor an easier time and the illution of having more torque. these small gassers will then have almost no fly wheel and this is the reason our zenoahs have so much grunt.
A Zenoah converted to electronic ignition (I always converted mine to save weight), with the huge flywheel mass removed, runs just fine (actually better and more responsive).

No purpose-built EI gasser has a flywheel: Simply not needed.

I've been flying gassers since 1986; I wouldn't steer you wrong.

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02-10-2006 07:31 PM  12 years agoPost 128
jackheli

rrProfessor

Vancouver - Canada

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Is it time to convert my Pred 70 SE/680 blades into the G90? It seems like a better deal than getting it into a MAX/710s

I would rather not be the first one to try...

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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02-11-2006 12:28 PM  12 years agoPost 129
avator

rrVeteran

New Jersey

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Ubie,

Thanks for the clarification on the Webra conrod. I wonder why the high oil content then?

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02-11-2006 01:07 PM  12 years agoPost 130
nivlek

rrProfessor

Norfolk England

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I suspect the extra oil is for cooling . I'll be going for the Webra , being aimed directly at helis , and praying for them to bring out a petrol version of their 55H .

At the end of the day , it gets dark .

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02-12-2006 09:00 PM  12 years agoPost 131
nivlek

rrProfessor

Norfolk England

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The latest on the Cyberheli site says the Webra 91 gasser is expected around mid-May with a sub $500 price tag .

At the end of the day , it gets dark .

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02-13-2006 01:46 PM  12 years agoPost 132
Yug

rrMaster

UK. Herts

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Dang, this has got me all excited. My tipple is 3D so I'm not sure how well it would run in a 90. However i've been thinking of building a stretched raptor 50 (or XeroG). This engine may just be the ticket

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02-13-2006 02:58 PM  12 years agoPost 133
Dr. Fibinotchi

rrKey Veteran

Sioux Falls SD

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hehe


let me know how that works out...I would follow suit as I was thinking the same thing. Would like to stretch the zero a bit. Engine is powerfull but thirsty.


-Cody

If you want others to be happy, practice compassion. If you want to be happy, practice compassion.

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02-13-2006 03:33 PM  12 years agoPost 134
Yug

rrMaster

UK. Herts

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The Raptor Titanium comes to mind, but that will only allow 620s. It'll be worth keeping an eye out for how the XeroG 700e progresses as this is intended to run 690s (or something like that). That will have a beefed up head as the R50 QuickUK head probably won't be man enough for the job. I'd certainly be happy sticking with a tail belt - so simple.

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02-14-2006 01:15 PM  12 years agoPost 135
avator

rrVeteran

New Jersey

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Warren,

Are you flying a converted Zenoah (electronic ignition) minus flywheel in a heli? Fixed or variable timing? I'd like to hear your thoughts on this as compared to a standard 231. Seems it would have a substantial weight savings.

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02-14-2006 04:54 PM  12 years agoPost 136
Tanager

rrApprentice

El Monte, California

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Warren,

Are you flying a converted Zenoah (electronic ignition) minus flywheel in a heli? Fixed or variable timing? I'd like to hear your thoughts on this as compared to a standard 231. Seems it would have a substantial weight savings.
Yes, I flew this conversion in both my previous Zenoah ships and it shaved off about 12 ounces total once you calculate in the addition ignition battery pack etc..

I could not detect any significant power increase with the variable timing module when I tried it.

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02-14-2006 05:07 PM  12 years agoPost 137
avator

rrVeteran

New Jersey

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Thanks Warren,

That's good info. 12 ozs I would think is substantial. Could even be more if you weren't using lithium batteries for the ignition system.

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02-15-2006 04:06 AM  12 years agoPost 138
Megcor

rrNovice

Monroe, Wa

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Just love it when UPS leaves me gifts.
Received my G90 today and will start working on the conversion tomorrow. All other projects will be put a side as I have been wanting to get away from nitro for a long time.

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02-15-2006 04:22 AM  12 years agoPost 139
Pre-Mix

rrApprentice

U.S.A.

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EI
With the success of these on-board generator systems courtesy of Raja, I think a very effective power source for the ignition system could be a viable reality. As long as gassers are able to fly on a tank of fuel i would suspect the EI battery would be the first thing halt the days flying. There would of course still be a back up battery, but a small one. Raja, looks like we have another project for you!

Johan

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02-15-2006 12:30 PM  12 years agoPost 140
Cap232ex

rrApprentice

Amanda, Ohio

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If you can run down a ignition battery in a day you have to do some major flying I have went 2 days on my twin's in my planks w/o a charge.

Charles

Predator Gas SE, Hawk Pro, X-cell 1003

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