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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › ((( OFFICIAL: Century Radikal G20 Gas Powered Helicopter )))
10-23-2009 01:31 AM  8 years agoPost 121
gorn

rrElite Veteran

Western Australia

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lol no that would be stupid.
The rpm listed on paper is not the redline.
The G20 has not just been released.
Its been out for about a year now, so the motor is reasonably well know for what its capable of as far as power and rpm go.
If that rpm limit was exact, you would not find it in any heli.

For the love of the hobby

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10-23-2009 01:40 AM  8 years agoPost 122
Blade_Master1

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Canada

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the limit they wrote down is the limit if you want it to last longer
I can't see running 3,000 rpm over the factory recommended specs.
sure it may work for awhile and this is the first heli the motor gets used in.
so if 13,000 isn't redlining the motor what is the motor Max rpm ?

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10-23-2009 01:50 AM  8 years agoPost 123
gorn

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Western Australia

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all I know is that they have been working in others heli's at higher RPM than stated.
Billme is the guru of gas, and he does not like unreliable anything lol.
So ask Billme what the BEST maximum constant rpm is for the G20.
Id bet its not 8800 rpm.
I found a spec sheet that listed peak power at 8500, but usable rpm range was 1800-10000.
You have to remember that the peak power is listed with a stock tin can muffler too.

For the love of the hobby

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10-23-2009 02:02 AM  8 years agoPost 124
Blade_Master1

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Canada

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not arguing just trying to figure out who is BS'ing us
I found a spec sheet that listed peak power at 8500, but usable rpm range was 1800-10000.
it says useable range 1800-10000,
after 10000rpm what is useable?
if they wrote rpm range from 1800-15500 rpm then 13000rpm would be acceptable

Im not ready to spend 350$ on an engine that may not last because I'm running that close to the max rpm?

It would be nice if Bill posted what the max rpm was and what pinnion is needed for certian HS

Ya I know it's engine rpm / (84t/*t) = HS
but it would be nice to hear from the one who did the testing

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10-23-2009 04:15 AM  8 years agoPost 125
Dr. Fibinotchi

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Sioux Falls SD

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hmm
I am sure you could contact Century direct and they would be happy to help you. Bill does pop on here, but I dont think he is on every day reading posts. It seems you are trying to fight a battle when there isnt one. The 20 stock might be that rpm, but its highlly advisable to get it modded just like all of the nitro guys mod there motors. The 20 modded will run at 13k just fine. The porting, sqaush, and compression that matters and will tell you at what rpm is max power.

You have to remember back in the day when the 1005 gasser came out it was for slow flying and the numbers where just as conservative. Just take it with a grain of salt as its a stock motor number thats given. Dont read into it. Modded motors will go higher.

-Cody

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10-23-2009 05:14 AM  8 years agoPost 126
MAXHSHV

rrKey Veteran

,mn usa

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I have alot of experiance with dirtbike and snowmiobile 2 stroke motors and for that size of motor 13000 seams very dueable, , the average 80cc dirtbike peaks at 16000 18000 rpm and that is four times the size of the 20cc g20 motor,as far as rpms and porting , a pipe goes a very long way to higher rpm and moocho grande more power,bh hanson has a modded 230 that puts out 4.8 hp with a pipe and i'll bet it is well over 10000 rpm to do it.as far as how long will it last, i priced the parts before i ordered mine, pisons , bearings, ring ,gaskets are half the price or less then for a 50 nitro, and a 50 nitro is no long lived motor,by anyy means , so with some good oil and 92 octane fuel, it think motor maintence cost will be alot less then a nitro.even the crank and crank cases are dirt cheap, heck the whole cylnder is cheaper then most liners for a nitro motor.
if you whant a maintence free heli fly eletric.

Century heli rep. To much power is never enough.

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10-23-2009 06:12 AM  8 years agoPost 127
Gearhead

rrMaster

Vt

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""To be honest I don't see how your suppose to get a 2000HS with the current gearing""

geezzz

Blade Master,, any engine can be ran higher than it's Maximum Rated Power Output if it's geared or propped to do so,,

what do you think will happen if you use a very small prop with a lot of pitch on a plane,, the engine will rev high with that small prop, it wont pull as well at lower RPMs but it will make the plane fly,, well a heli is NOT a plane, look at all these guys running their Hyper 50s at 18,000 and 18,500 to get a 2200 Head Speed,,

go out get in your/a P/U truck, start it and put in 2nd gear and open the throttle as far as it can open, I bet it's engine will rev higher than it's Maximum Rated Power Output

Jim
Buzz Buzz Buzz

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10-23-2009 06:36 AM  8 years agoPost 128
Gearhead

rrMaster

Vt

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""the limit they wrote down is the limit if you want it to last longer""

BM,, I think not, yes the less an engine revs the longer it may last, but Zenoah rates an engine at it's Power Output numbers, not where it lasts the longest !! if it's Power Output happen to be 300 RPMs higher then Zenoah would have used that higher number !!

look at the Heli Guys and Boat Guys that are using Hanson modified engines, these engines are run/revving higher than Zenoah rated them, and YES they most surely wont last as long as stock engines, BUT that is part of the hobby !!!!

look at the Gasser RC plane hobby,, you can buy a Gasser Engine and have it last 20 years or longer with a muffler on it,, or you could put a Tuned Pipe on it and it may have ????? a 25% shorter life span, that would be a 15 year life

Jim
Buzz Buzz Buzz

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10-23-2009 09:25 PM  8 years agoPost 129
Blade_Master1

rrElite Veteran

Canada

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So what everybody is saying so far is:
For this Gasser to spin a 2000HS

1) I need to buy the 150$ pipe
2) after spending 350$ on the engine I am supposed to spend another 100$+ to mod the engine ????

Come on guys thats over 600$ to make this heli do some 3D

I think I'll wait for you guys to try it first

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10-23-2009 10:27 PM  8 years agoPost 130
CNCjunkie

rrVeteran

Kauai (The Garden Isle), Hawaii - USA

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Add up the costs you would spend on nitro fuel vs pump gas and you'll see it still makes sense. It does to me anyway...

Just another crappy day in Paradise....Aloha!

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10-24-2009 12:03 AM  8 years agoPost 131
oldfart

rrProfessor

Vancouver, Canada

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We must understand that these engine specs are those considered for R/C airplanes, which almost all use a FIXED pitch prop. Also, one that is attached directly to the front of the engines crankshaft. They do not use a gearing system and "variable pitch/constant speed" props (CP rotor systems) as do our helis.

Consequently, the rpm range that will be suggested, takes into consideration the resultant loadings of the range of practical fixed pitch props that it would have to work with. This obviously means that the suggested rpm range will take into consideration the fact that any prop that would present a light enough load to the engine that would allow it to turn up past 10 or 11 thousand, would be too small to generate enough thrust to properly fly any airplane it would be mated to.

The loads presented to the motor from a geared system, with a "variable pitch" rotor, on the other hand, are very different indeed. That is why the rpm's the motor would be comfortable with in one application would not be the same as those it will be comfortable in another application.

Unlike 4-stroke engines, where valve float will limit rpm's much more directly. Here we have a two stroke engine that is not so limited. Of course the faster you turn anything the more critical not running lean or with bad bearings, etc. becomes. But as these are running on gasoline rather then methanol and nitro, and are using much larger bearings etc. they can take a lot bigger beating so to speak, and still come back with a big smile, for a long time.

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10-24-2009 12:08 AM  8 years agoPost 132
Blade_Master1

rrElite Veteran

Canada

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1200$ for the engine and a 50/60 size heli you are telling me I will save 600$ in fuel ? my first year maybe over a 2 year period if I don't blow the engine

I'll wait for the reviews

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10-24-2009 12:42 AM  8 years agoPost 133
oldfart

rrProfessor

Vancouver, Canada

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BM1

A lot depends on how much you fly in any given period of time as to how much you would save. But let me use the example of my big Predator gasser with the G231. I found it 3D's a bit better then my Predator 60, but not quite on par with the Predator 90.

Each flight I take with my Predator 60 (not 90), used up the tank of 30% fuel in 11 minutes. I can get about 7 flights a gallon with it. A gallon of 30% runs about $32.00CDN a US gallon in this neck of the woods. Seven 11 minute flights is a total of 77 minutes. So each minute of flight costs $32.00/77 = 41 cents

My Predator GS/G231 takes 30 minutes to burn the same tank of fuel. The same US gallon of gasoline would work out to about $3.60 CDN. Seven 30 minute flights work out to 210 minutes of flying. So the cost per minute is only $3.60/210 = 1.7 cents + about 1 cents for the oil, for a total of 2.7 cents a minute!!!

So if I have only 140 flights a year with my 60, I will have burned about 20 gallons of 30% nitro fuel, for a cost of about $640.00 and flown for 1540 minutes.

That same 1540 minutes with my Predator gasser only cost me 1540 x .02 = $30.80 - less then one gallon of 30% nitro!!!

Where do you get the figure of $1200 for the engine?? The way I see it, is that the engine and muffler (we will use US dollars) would be about $490.00. The heli with engine is about $350 more then without and the muffler is another $140. Which is not much more then what the cost of an OS50 hyper and a decent muffler for it is.

So it seems to me, ones cost saving on fuel might well take a lot less then one season to make up...and I do not think one would have to replace the bearings in it after the season either.

Is the Radikal going to be the 3D animal that a hot 50NX can be. Maybe not, just as the Pred GS is not the 3D animal my the Pred Max 90 is. But I bet those flying it will have as much, if not more fun with it, then I get out of my Predator gasser - which is a lot.

Just some food for thought.

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10-24-2009 12:52 AM  8 years agoPost 134
Dr. Fibinotchi

rrKey Veteran

Sioux Falls SD

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heh
"Come on guys thats over 600$ to make this heli do some 3D
"

yup. and even without looking at the new os 55's on the market and the pipes for those are clmbing in price pretty hard. 300 is not hard to hit on a new 50 power plant with a good pipe.

-Cody

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10-24-2009 01:00 AM  8 years agoPost 135
Rodney

rrVeteran

St.Cloud,Florida

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Has anyone considered the amount of torque the motor is going to make over a nitro machine. With more torque you run more pitch at a lower head speed. So 3D is capable with this combo. Lets just wait and see what the pilots have to say in a few weeks.

Dx7 With Ion Power Supply. Why use anything else.

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10-24-2009 01:01 AM  8 years agoPost 136
oldfart

rrProfessor

Vancouver, Canada

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oops sorry BM1, I think I misunderstood your $1200.00. You were probably talking of HELI and muffler in CDN$

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10-24-2009 01:20 AM  8 years agoPost 137
Blade_Master1

rrElite Veteran

Canada

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650$ for the kit
350 for engine
150 for the pipe
~100 $ to mod engine
-------
1250$ US
it will be more for us Canadians

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10-24-2009 01:42 AM  8 years agoPost 138
Gearhead

rrMaster

Vt

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Blade Master,, it' is what it is, it's just another heli in the world of Model Helis,, you could buy a $2,600 Hirobo Eagle kit, and you would still need a $400 engine and muffler..

Jim
Buzz Buzz Buzz

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10-24-2009 01:51 AM  8 years agoPost 139
Blade_Master1

rrElite Veteran

Canada

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I am complaining prematurely the kit isn't the the issue

it's the 350$ engine that needs 250$ worth of upgrades

I think the kit is a great value
for about 50$ you can stretch it to a 90 size gasser and use the 231 instead, all you need is a 90 boom and belt
maybe the predator boom and raptor belt for 90

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10-24-2009 02:46 AM  8 years agoPost 140
James Kovach

rrKey Veteran

canton, oh - US

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it's the 350$ engine that needs 250$ worth of upgrades
Who says it NEEDS those upgrades? Bill was on our show the other night. He said it is perfectly 3D capable stock out of the box.

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