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HelicopterMain Discussion › scale the power plant
10-19-2004 05:51 AM  13 years agoPost 21
JKos

rrProfessor

Redondo Beach, CA

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> I thought full size helis turn a head speed of 1200 ????

Oh my, no. I think about the highest is about 500 RPM.

Hughes 300: 440-460 RPM
Rotorway 162F: 520 RPM
Bell Jet Ranger 206B-III: 395 RPM
Russian Mi-24 Hind: ~200 RPM

Well, that's just a few examples.

- John

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10-19-2004 07:01 AM  13 years agoPost 22
fritzthecat

rrKey Veteran

Virginia Beach, VA

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Those who can't fly do scale, so you will rarely ever see someone flying a scale model "rip it up" most of them couldn't do it if they wanted to.. That's why they fly scale..

Wow, an even more A-hole statement.
Have you ever flown scale? Or 3D?
Flying a heavy scaler like the real thing is harder than flip/flopping an overpowered bling machine all over the sky. I know, I've done both.


Fritz


'Send Money, Women and Guns!'

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10-19-2004 06:04 PM  13 years agoPost 23
Gearhead

rrMaster

Vt

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don't mind Jeff,,, he's playing bad cop today LOL


Jim

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10-20-2004 02:52 AM  13 years agoPost 24
Peter Wales

rrElite Veteran

Orlando Fl

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Just as an aside, this month there is a helicopter on the front cover of Model Aviation for the first time.

And no, its not one of those ultra boring 3D flip'n floppers!!!

Congratulations to Dr Tim, a true wake up call to the rest of the model aviation world, unmatched by any pod and boom machine Scale rules!!!!

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10-20-2004 02:57 AM  13 years agoPost 25
Wa11banger

rrElite Veteran

Huntsville, Al

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I haven't recieved mine yet.. Is it his turbine Cobra? Hell I'll just call him and ask hehe

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-20-2004 05:56 AM  13 years agoPost 26
Inspector Fuzz

rrKey Veteran

NLA

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Thenthitivity...

@ Fritz... Hey man, I am just pullin' your laritat.. You know those little faces you can put in your email?? They are called "emoticons".. The little "winking" one indicates sarcasm and so can the big grinning one, too..
I have a lot of respect for the scale guys, I just think the question about scale power for a model is silly.. Do you think that full scale pilots would turn away more powerful motors if they could??
As for the flying, I think the scale pilots have made great progress.. I know longer see them walking behind their hovering helicopter while both heli and pilot plot a large "sqare" around the field..
I think that old system of scale judging really gave a lot of folks the idea that the scale guys can't fly.
JEFF

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10-20-2004 06:14 AM  13 years agoPost 27
classic

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All over the place!

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I think what Fuzz meant is that there are most scale guys who can fly extemely well pod an boom and who build and fly scale birds very well, there are also a small few out there who cant fly anything very well, so they get into building scale ships, and all they can do is hover them tail in very carfully with a little right to left flight thrown in.
Kinda Like how p wales flys.

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10-20-2004 12:07 PM  13 years agoPost 28
Peter Wales

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Orlando Fl

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Hey, thats not fair, I also do a litlle up and down as well

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10-20-2004 03:34 PM  13 years agoPost 29
classic

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All over the place!

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Its all that freakin' power in your turbine that lets ya go up an down

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10-20-2004 04:08 PM  13 years agoPost 30
GMcNair

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Birmingham AL

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Rest assured there's no such thing as too much power for these helis. My bell 47 weighed 23 lbs, powered by a Zenoah G23. The pilot had to fly it with the same "thinking ahead of the power curve" that a full scale pilot did because it didn't have the power to just stop and turn on a dime. Ask Steve Campbell. He didn't believe me and shrugged my warning off. 30 seconds into the flight, he said "Holy &#!^ you weren't kidding!" And he enjoyed the rest of the flight. I'm sure Peter's Lamas fly in the exact same manner. You must plan accordingly.

The smallblock V8 that's going in here should do the trick, but dang it's going to be heavy!

For what it's worth, the headspeed of a full size Jet Ranger is ~350rpm. The headspeed of the heli shown above will be 700rpm.

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10-20-2004 04:45 PM  13 years agoPost 31
Branzzz

rrVeteran

Singapore

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holy cow that's a BIG heli! i admire scalers for their incredible patience. i myself detail my heli in my own way, that is to add small nice touches to my own rappy. peter, just wondering, how does your fly barless head fly? do you need to have a ton of exponential?

Raptor 50V2
OS 50SX-Hyper
GY502/9253
Hitec 6975
Airtronics ERG-VB
JR 3810

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10-21-2004 12:12 AM  13 years agoPost 32
classic

rrElite Veteran

All over the place!

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GM,
What size main blades are you putting on that golith?
Let me guess, 680's on the tail?

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10-21-2004 01:25 AM  13 years agoPost 33
YSRRider

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usa

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thats a great picture of "THE BOB'S"

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10-21-2004 02:14 AM  13 years agoPost 34
billrad

rrApprentice

Rineyville, KY

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I think if you made the whole body aerodynamic, like a rotor blade, then switched the reverse switch on the gyro, you'd get a lot more lift from the uncontrolled pirouetting of the whole heli.

But, flying may be tough...hmmm

I may not be able to turn a kit into a plane, but I can turn a plane into a kit...

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10-21-2004 04:11 AM  13 years agoPost 35
shuttlepilot

rrElite Veteran

Mullins, South​Carolina

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1200 rpm on a full scale heli!!!

Not possible because the tips would go supersonic and start to disintegrate. Or at least I think that is close to the reason. I'm sure full scale helis would run higher head speeds if physics would allow it.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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10-21-2004 05:55 AM  13 years agoPost 36
GMcNair

rrKey Veteran

Birmingham AL

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The mains are 1350 each, with a total main diameter of 3 meters. The tail blade grips are Raptor 30 main grips, and the blades are 218mm long with a 45mm chord. Here's a good idea of the size:

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10-21-2004 12:36 PM  13 years agoPost 37
Peter Wales

rrElite Veteran

Orlando Fl

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These helis fly like a dream. Hirobo have made true scale head with working dampers and it is very easy to fly. Its not so stable in the hover as a flybar heli. I initially set it up with a ton of expo as I usually do, but the head is so docile I ended up taking it all out except on the tail.

One reason for the good flying is the blades. They are 950mm long and each weigh in at 550gm. Thats 1 lb of lead in each blade, There is a steel wire running through the blade root and through the lead so that if you break a blade nothing goes flying off.

Headspeed is supposed to be 800 rpm but after consultations with the engineers at Hirobo and Peter Jakadoksky, the turbine manufacturer, the headspeed is now upto 1000 rpm.

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HelicopterMain Discussion › scale the power plant
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