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HelicopterGasser Model RC HelicoptersOther › Is there a stronger engine for the radical?
01-01-2010 09:55 PM  7 years agoPost 161
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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you lose head speed, which may be ok for FAI flying but not 3d
its not okay for ANY type of flying.

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01-01-2010 10:50 PM  7 years agoPost 162
C.A.P.

rrApprentice

custer park IL.

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The thought that you need a heaver fly wheel to help make these engines right, Is right & wrong, the "right" is the timing is set in advance for higher rpm all the time no changes in the timing just advanced, so at lower rpm the engine will run very rough or not at all with out the heavier fly wheel, The "wrong" take the 260ei or the 20ei they both do not have anything close the the mag wheel weigh the puh mag has, Why, timing , the EI has a chip that retards the timing when the rpm drops below 6,000 rpm (depending on what ei you are using), With the retarding of the timing you get a smooth and even idle, Without the heavy fly wheel mag, [list]

[pgkevet
is correct lower rpm just lowers the frequency of the vibration, they are still there, and can still do damage just takes a little longer, balancing is the answer to do away with as much vib as possible, [

kogibankole
Is like a lot of people who find running at high rpms will ripe up your heli,lower rpms will cause an engine to run cooler which will help it run stronger and last longer, running higher rpms will shorten the live, of course most of you guys will never notice this, until you get a better engine, Not all of you people are like Raja, he has a lot of year of trail and error to do what he does best, but he does FAI not hard 3D, there is a bigger difference in stress on the engine and heli. you need more torque for hard 3d to maintain head speed, Wally

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01-01-2010 11:20 PM  7 years agoPost 163
rbort

rrProfessor

Franklin, MA - USA

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Depends on your definition of '3D'

My 3D is smooth, not the crack stick tick toc stuff. I concentrate on precision and perfection in the travel lines. Most of the maneuvering I do are in idle up 1, at arounnd 11600 to 11800 of the engines depending on my gr between ship. Its on the torque there and is very consistant in the head speed. You can see that in the 495th video that was shot of my Spectra back in 2006 timeframe. Here is a link:

http://www.livevideo.com/video/Rapt...ne-of-his-.aspx

This is quite an old video so since then I do more stuff now but generrally speaking its all smooth aerobatics not stick bang style.

I use the higher head speeds (around 12,500 on the motor) for FAI style flying which is big, wide, and with alot of speed. That is really FAI style flying which is different from smooth 3D that I do.

I agree the lower you run the motor speed the more it lasts. Over minutes, revolutions as up and that in the end means wear. That's why I have 3 speeds on my helicopter and you don't see me doing hovering maneuvers in idle up 2. I spin it when I need it, and slow it down when I don't. The engine always runs cooler with lower rpms, I see that with temp guage checks and lately people with in-flight graphs back it up. An exception to this is loading heli with too much weight and overloadinng the engine with slow rpms, but for proper flying rpms and load, this statement is pretty accurate.

-=>Raja.

MA 1005 Hanson 280, 4142 flts
Spectra 27 3DMax, 3210 flts
Whiplash V1 Hanson 300, 1440 flts
Whiplash V2 Hanson 300, 207 flts

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01-02-2010 12:37 AM  7 years agoPost 164
C.A.P.

rrApprentice

custer park IL.

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Raja, look what the new year has give us!! We do not disagree!! FINALY , AND I DID WRITE HARD 3D, NOW THIS IS NOT PUTTING YOU DOWN, Cody out flys you when it comes the hard 3d, he likes it that way, like you like the way you fly, the 27cc is design for both, very hard 3d with low rpms and very high head speed, Which you can make even lower, and still have very high torque at any rpm to suit anyone taste, So would you not like to have an engine that could do it all at 12,000 rpm or lower. Just fly at any pace you want without worrying about idle 2 or 3 setup, That's what torque to hp gives you, Wally

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01-02-2010 12:49 AM  7 years agoPost 165
rbort

rrProfessor

Franklin, MA - USA

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Very Happy to hear it Wally!

Glad 2009 is over with

-=>Raja.

MA 1005 Hanson 280, 4142 flts
Spectra 27 3DMax, 3210 flts
Whiplash V1 Hanson 300, 1440 flts
Whiplash V2 Hanson 300, 207 flts

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01-02-2010 01:14 AM  7 years agoPost 166
Rodney

rrVeteran

St.Cloud,Florida

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Well Wally and Raja. I am not bashing on either of you, you both have forgotten more than I know. BUT this post is about the g20 ei. All your comments and post seem to be related back to the 26 or 27. Totally different motors and power curves Im sure. I flew my P-Gasser on rpms, which worked for me rather well. Going to see what the Radical will do as well at 13800.

Dx7 With Ion Power Supply. Why use anything else.

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01-02-2010 01:20 AM  7 years agoPost 167
Fixit

rrElite Veteran

UK

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Going to see what the Radical will do as well at 13800.
I know the 20cc will run at 13800 but for how long is anyone’s guess.

I only like to fly gassed up

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01-02-2010 04:44 AM  7 years agoPost 168
C.A.P.

rrApprentice

custer park IL.

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Rodney[

[You are right, this about the 20cc, but the principal of the 20, 26, or 27cc, works on the same principle, the only difference on the 20, is we have to change and mod the piston to get High compression, then we have to Increasing the fuel charge to the cylinder, all this works on the same principle to one end, to increase torque, the only difference is cc, when you talk about 2cycles you are talking about all 2cycle not just a cc. size, but I will try keep it on track, and Happy New Year, WALLY

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01-02-2010 05:50 AM  7 years agoPost 169
Billme

rrElite Veteran

MS

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I predict it will love 12800, to 13200..Leaning more to the 13200

I wish I hadn't said this, because this engine has amazed me..So has Wally, so I want be surprised at 14, but would rather keep it where I stated with more torque...

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01-08-2010 01:13 PM  7 years agoPost 170
WillyS

rrNovice

HOBART, OK USA

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but would rather keep it where I stated with more torque...

Wise choice,I do believe.

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HelicopterGasser Model RC HelicoptersOther › Is there a stronger engine for the radical?
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