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Other › Six Main Rotor TRex - Version 1.1
01-23-2007 02:09 AM  10 years agoPost 21
slider46

rrProfessor

Ocala Florida

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Shelldude I have my tail on the left side on my jet ranger, swapping over to the left side is not a big deal 15 min and your back in the air....

Tom..... No "D" flying....

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01-23-2007 02:12 AM  10 years agoPost 22
OZ-TREX

rrNovice

Brisbane, Australia

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SH

Fantastic as usual. I had a couple of questions on your 5 blade and sent you an email. I know you must be busy but did you get it??

Would love to see a shot of the swash arrangement.

I have detailed a five blade and am geting a head machined at the moment but the hinge arrangement worries me as my email discussed.

What do you mean by coned hub? can you please explain?

cheers

Of all the things I've Lost, I miss my mind the most...

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01-23-2007 02:41 AM  10 years agoPost 23
slider46

rrProfessor

Ocala Florida

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I would like more details too Super Hornet...

Tom..... No "D" flying....

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01-23-2007 03:11 AM  10 years agoPost 24
SSN Pru

rrElite Veteran

Taxachusetts

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have you designed your blades to flap or are they rigid? that would be a good starting point.

by the way, what do you do for a living? you dont design helicopters by chance do you? haha

good job on those helis, lets see how many blades you can fit on there? didnt a russian helicopter have 8 blades? i cant remember the name of it but its a GINORMOUS helicopter from what i remember. it was used by the US army in afghanistan to airlift a crashed chinook from the mountains...

pru

Stupidity can be cured. Ignorance is for life!

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01-23-2007 03:47 AM  10 years agoPost 25
Super-Hornet

rrVeteran

Singapore

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Hi all

First of all, my day job is got nothing close to aeronautical section. The helicopter design is purely out of hobby... I did once apply for a job in Bell Textron before but get rejected.

I think the maximum blades U.S. made heli is 7 blades but the one u mention about the Russia one is 8 Blades. I too can't remember the name but it is HUGE!

Well my multibladed head are all fully articulated. It is very very very simple design. U need to have some mean for the blade to flap...either by hinges or elastomeric (is that how u spell) or very flexible blades.

As for the pre-coning:
If u see some real (full size) heli, some of then uses pre-coning hub (like UH-1 Huey and Jet Ranger I think). What it does is that it make the blade to cone upward instead. That is why u see the blades are in a slightly V shape when it is parking somewhere.
Recently I came across a picture of full size Blackhawk (UH-60) or SeaHawk rotor hub and it looks like it is pre-coning shape as well. I hope someone who works with full size Blackhawk can verify this.

SH

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01-23-2007 04:12 AM  10 years agoPost 26
A&P

rrApprentice

Chandler, AZ

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I SOO need ne of those heads for my t-rex!

It would go great with my 1/10 scale MH-53.

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01-23-2007 01:20 PM  10 years agoPost 27
slider46

rrProfessor

Ocala Florida

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Super Hornet what is the center hub made of? How are the blade grips mounted to the center hub? can you make a drawing of how the parts fit together??? I'm getting ready to try building one but don't want to make alot of stupid mistakes...

Tom..... No "D" flying....

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01-23-2007 08:58 PM  10 years agoPost 28
SSN Pru

rrElite Veteran

Taxachusetts

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what kind of elastomeric materials do you use in your designs? or are they hinges? have you determined that one is better than the other?

pru

Stupidity can be cured. Ignorance is for life!

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01-24-2007 12:04 AM  10 years agoPost 29
Super-Hornet

rrVeteran

Singapore

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Hi slider46

The material I used in my multibladed head are mostly brass. Brass because it is easier to work with AND I can get it easily.

Just go ahead and do. Who knows, u might come out a better design than mind. If not work, well, see where it fail try again or improve from there. Don't worry about mistake. Know and learn from mistake is important.

Hi umdpru
I guess u already know that some newer heli (full size real heli) uses elastomeric materials as the flapping area. I wanted to try that but I haven't find out exactly how they do it yet and I haven't find any material that can do the job. Right now I only uses hinges. I notice that even our Align ABS blades still not flexible enough like a real heli.

SH

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01-24-2007 02:35 AM  10 years agoPost 30
SSN Pru

rrElite Veteran

Taxachusetts

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what would you recommend for the degree of flapping to be designed for? i would think that you wouldnt want more than a few degrees on each way...

pru

Stupidity can be cured. Ignorance is for life!

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01-24-2007 02:46 AM  10 years agoPost 31
Super-Hornet

rrVeteran

Singapore

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I not sure what is the best flapping angle allowable but:

On ground and when blade not spinning, the blade flapping can flap alot but still haven't hit the tail boom but I notice this,

During hover, the flapping (well lets call it the coning) is very little.
I also notice that the more blades it has, the lesser it cone.
Then I tried do a sudden punch up, the blades does cone a bit more but just for a while before the heli start going up.
The coning is also depend on how heavy the heli.

I guess the coning is small (even though my flaping hinges can allow it to go further) is because of the centrifugal force is pulling the blades away from the hub and thus the coning shape is lesser.

If u have your blades in a coning shape, the heli become more stable.

That is why this 6 bladed head has a pre-coned configuration in order to further "cone" the blade disc.

SH

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01-24-2007 02:50 AM  10 years agoPost 32
slider46

rrProfessor

Ocala Florida

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Can you take a picture of your head system up close??? Maybe I can get a better idea of what I'm trying to do...

Tom..... No "D" flying....

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01-24-2007 03:22 AM  10 years agoPost 33
SSN Pru

rrElite Veteran

Taxachusetts

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well, shoot, if you are gonna do that, how about some detailed engineering drawings while you are at it....

just kidding, im not looking to copy anyone. i have been thinking about designing up a multi bladed head for quite some time but never developed the ambition, time or the money to do it.

your insights have inspired me though!!

pru

Stupidity can be cured. Ignorance is for life!

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01-24-2007 05:15 AM  10 years agoPost 34
simarRC

rrApprentice

Toronto, Ontario, Canada

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wonder if there are multibladed heads for the 600...

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01-24-2007 05:25 AM  10 years agoPost 35
OZ-TREX

rrNovice

Brisbane, Australia

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mmmmmmm...multiblade 600 mmmmmmmmmmmmm

Of all the things I've Lost, I miss my mind the most...

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01-24-2007 06:12 AM  10 years agoPost 36
A&P

rrApprentice

Chandler, AZ

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A lot of companies make multi-blade rotor heads for a 10mm mainshaft.

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01-24-2007 08:37 AM  10 years agoPost 37
OZ-TREX

rrNovice

Brisbane, Australia

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A&P

Any web addressess or names where I can have a look??

Of all the things I've Lost, I miss my mind the most...

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01-24-2007 01:35 PM  10 years agoPost 38
slider46

rrProfessor

Ocala Florida

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Check out the scale forum for multi blade heads for 30 size machines. There are a couple of manufacturers for the bigger helis like the 600 or 30 nitro birds

Tom..... No "D" flying....

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02-13-2007 12:02 AM  10 years agoPost 39
Super-Hornet

rrVeteran

Singapore

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Hi all

Here is my latest update on my 6 bladed TRex.
Configuration so far:
eCCPM 90 with cyclic gyro (PG-03) due to windy condition. I prefer to fly with cyclic gyro anyway. OnBoard eCCPM mixer is done using 2 V-Tail Mixers.

These photo was taken by HZM (Mike) during Feb 11, 2007 funfly in Bishan, Singapore. Again, no one take video of my multibladed so only still pictures.
{ Thanks Mike for taking those pictures }






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02-13-2007 01:13 AM  10 years agoPost 40
slider46

rrProfessor

Ocala Florida

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That is sweet... Congradulations on another great head 6 blades It looks like it flies awesome...

Tom..... No "D" flying....

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