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12-18-2010 03:38 AM  7 years agoPost 81
Ghostrider

rrElite Veteran

San Diego, CA

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Tim's a stand up guy in more ways that one, and I get the impression from him and other's who know him, that he wouldn't rubber stamp something in this hobby for any reason I can think of.
That is absolutely 100% true about Mr. Jones.

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12-18-2010 03:18 PM  7 years agoPost 82
JayL

rrVeteran

Leesburg GA

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I just dont see the benifits of using that long pipe I know u can use lower nitro fuel but come one when u hit the ground that thing is bent up u sure and we all crash right chris. its also got to throw off the cg a little especially when using fbl. Just a thought

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12-18-2010 07:28 PM  7 years agoPost 83
Dr.Ben

rrMaster

Richmond, VA, USA

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Some models have a more adjustable/workable CG range than others. Certainly you have to set it corrected taking the weight of the pipe into consideration. The long chamber pipes aren't as heavy as you might think because a lot of that length is just cylinder made of thin walled aluminum. As for the crash, there is more hanging out in the breeze. The way to look at that is that is some cases, the pipe is going to allow you to save 7-$10 per gallon of fuel. Unless you hit the ground every case of fuel, it's easy to break even even when allowing for the possible loss of the pipe in a crash (and that won't happen with every mishap). Pipes aren't for everybody, but a model well tuned on one makes a TON of inherently self governing power.

Ben Minor

Team Futaba Team Kontronik USA

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12-19-2010 02:04 AM  7 years agoPost 84
alfred

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Australia, New South Wales, Mid North Coast

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On top of that, if you look at today's mufflers, these are huge large objects hanging of the side of the engine.
A pipe would actually be less prone to damage, as it is connected to a Header via a silicon tube. It then is usually run to the boom, so it swings back in line with the heli.
There used to be helies around which were designed for pipes.
I have helped a guy here with a Robbe Mosquito which had the engine sitting sideways in the frame and the pipe was then smack in line with the frame to the boom. Coming out at the back of the frame gave it far greater protection then any of our today's mufflers would get.
It was running a Nova Rossi engine and when it got onto the pipe, it just hammered at a very consistent rpm.
Talking about a great build in governor .

At some stage there were also rear exhaust heli engines for the exact reason to keep the pipe in line.

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12-28-2010 06:56 PM  7 years agoPost 85
Charlie R

rrApprentice

Lafayette Ca

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when
Anyone know anything ? Is YS still working on a 120 , anyone have one to test ,when might it be out ?

Helicopters are a mass of rotating metal fatigue surrounding an oil leak !

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12-28-2010 10:47 PM  7 years agoPost 86
helismash

rrKey Veteran

Gloversville, NY - Fulton

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and I just bought an airframe, hmmmm.........

Hey, Who put the ground there!
T-Rex 500/T-Rex 600N FBL/T-Rex 600E PRO/T-Rex 700N/T-Rex 700FBL

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12-29-2010 06:20 AM  7 years agoPost 87
GootyS

rrApprentice

Gauteng South Africa

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I would love to see a vid of this motor at play.

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01-06-2011 07:37 PM  7 years agoPost 88
Jim Woodward

rrApprentice

Boca Raton, FL

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Any updates? Glad to see a glow motor being developed to close the gap or match the electric performance. Seems only fair Hopefully the competition rules will open up the dispacement soon too given the huge disparity between .91 2-cycle versus 12s E setups.

Nice to see a fact based post from the pilot running the new motor shut down the negative conjecture.
Thanks,
Jim

Team Futaba

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01-08-2011 03:18 PM  7 years agoPost 89
wjvail

rrKey Veteran

Meridian, Mississippi

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...Glad to see a glow motor being developed to close the gap or match the electric performance. Seems only fair ... Nice to see a fact based post from the pilot running the new motor shut down the negative conjecture.
Why do you have to say things like that?

"Well, Nothing bad can happen now."

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01-08-2011 03:28 PM  7 years agoPost 90
Inspector Fuzz

rrKey Veteran

NLA

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I guess I am probably one of the guys giving the "negative conjecture". My comments about keeping a .61 sized case and crank balancer and doubling the motors displacement is apparently "negative".

Since there are no worries with continueing to bore out a motor with no change in the bottom end, why stop at a 1.20??

Why don't they just make a 2.4 or a 5.0? Will there be any problems when the bore is 10X that of the stroke?

This is a chance for a motor maker to take a stand and build a proper size case for the motor. If the motor is a winner, heli manufacturer will offer larger mounts/conversion kits and will build their new designs around accepting this larger platform.

If YS was smart they would partner with Align or Curtis and the ENV and come up with a design tht will hang in there.

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01-08-2011 04:11 PM  7 years agoPost 91
DS 8717

rrProfessor

Here wishing i was somewhere else

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If YS was smart they would partner with Align or Curtis and the ENV and come up with a design tht will hang in there.
What is Todd Bennet a nobody? Real world testing is real,either it works or it doesnt.......

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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01-08-2011 05:20 PM  7 years agoPost 92
Inspector Fuzz

rrKey Veteran

NLA

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"Tested" means nothing. Do they make any changes as a result of the tests?

If you look at the case on an OS 91 ducted fan motor or an OS 1.08 you will get an idea of the size that the case should be for this displacement. Our heli motors spin very fast for their size and they do not have the axial load that a plane motor has to keep the balls pulled tight against the races. Unless Y.S. is using some sort of mallory metal on the counterbalancer and or seriously shaving down the piston the motor will have more vibration than the .90's which all vibrate more than the .60's did.

Again, if the size of the case does'nt matter, why not just bore them out to 2.4ci so that we can run no nitro fuel and have more power than the 12S setups?

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01-08-2011 07:17 PM  7 years agoPost 93
DS 8717

rrProfessor

Here wishing i was somewhere else

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YS sends prototype motors to pilots in the US to test,and make changes according to what the test pilots tell them. Hatori also sends mufflers to these pilots to design a muffler for that perticular motor,so Todd is a test pilot for YS and Hatori. Maby if OS did this they wouldnt have had so many bad design 91's,the early 91's from OS were pitiful. So yes they make changes according to what their test pilots tell them after testing them.Ducted fan motors turn a lot more RPM than our heli motors,our motors need torque not RPM.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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01-08-2011 08:05 PM  7 years agoPost 94
Jim Woodward

rrApprentice

Boca Raton, FL

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The bottom line is that YS is an actual manufacturing company who has put their $$$ at risk for new product development because they believe there will be a customer base or demand for this product.

They are not a pop-up Chinese patent ripping company that starts copying and selling electric motors or ESCs or batteries.

Bare with my small comparison - the waters parted and the path was paved for all things and to the glory of "electric". airframes changes, mounting, ESC development, battery development, props or blades - whatever was needed it was done as new and revolutionary (these changes are facts else the product would not be in the market). Electric is great and has its place.

Now - YS has a new motor in development and there is negative conjecture about the airframes not being able to handle it, and negative conjecture about the balance of the motor. These are not fact based in regards to this motor.

Wait till the product is released to slam it or hail it. Thats my point.
Thanks,
Jim W.

Team Futaba

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01-09-2011 03:42 PM  7 years agoPost 95
Inspector Fuzz

rrKey Veteran

NLA

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I think I will wait for the 2.4ci version.

Seriously, my main complaint here is that no motor manufacturer is willing to "get out there" with a proper size case.

YS could team with Align, a very forward thinking company, and get at least one model built that will take a properly sized motor.

No single cylinder motor is "truly smooth". This is because there is nothing to balance out the "side to side" hits of the counterbalancer.
The new 1.20 may not break frame bolts, but there is simply no way for it to get smoother than the smaller displacemtn motors that use it's case.

For the fella who remarked about DF motors spinning fast and heli motors needing torque, you need to understand that increasing the stroke of a motor is what increases it's torque. The whole lever principle. You can't increase the stroke without increasing the size of the crank which is not possible unless you increase the size of the case.

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01-09-2011 03:54 PM  7 years agoPost 96
DS 8717

rrProfessor

Here wishing i was somewhere else

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You can't increase the stroke without increasing the size of the crank which is not possible unless you increase the size of the case.
You change the stroke by moving the crankpin not the whole crank,which is what YS did....I would say the crankcases for the 60's were overbuilt,more than what what was really needed. I understand fully how engines work,i have been building and modifying engines for 55 years.........

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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01-09-2011 04:04 PM  7 years agoPost 97
Inspector Fuzz

rrKey Veteran

NLA

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How can you move the crankpin, within the radus of an existing "circle" and effectively get a longer lever?

As you move the pin outward from the center of the end of the crank you create the "lever" that the connecting rod pushes on to turn the crank. A longer lever gives more torque.

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01-09-2011 04:34 PM  7 years agoPost 98
DS 8717

rrProfessor

Here wishing i was somewhere else

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You change the location of the crankpin when you grind it from the raw forging....just like most crankshafts. I know how levers work,you can increase torque by other ways than just increasing the stroke.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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01-11-2011 02:25 AM  7 years agoPost 99
Helifat

rrApprentice

Vista,Ca

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Hi guys...I went to the Ontario AMA show this weekend and took a couple pics at the new upcoming YS 120...sorry quality is not the best but here they are...

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01-11-2011 03:05 AM  7 years agoPost 100
alfred

rrVeteran

Australia, New South Wales, Mid North Coast

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Doesn't look any different then any of the other YS91's.
The head might be a bit bigger?

Is that an aluminium backplate?

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