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Autography FlightPower . Advantage Hobby . Revolution Models

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e-Align T-REX 250-450-500-600 > Why not 90 degree CCPM?
 
 
WreckRman2
Key Veteran
Location: Indianapolis, IN

Why do I not see anyone talking about 90 degree CCPM? It wouldn't require and mods to the swash and mounting the HS56 servos should be fairly simple with their ability to side mount.

Is there a problem using 90 degree CCPM or is it just most companies are building them with 120 degree CCPM? I'm seriously thinking about giving it a try.
02-01-2005 Over year old.
 
 
freddy168
Heliman
Location: London

You will need 4 servos for the cyclic, which means more weight and an extra channel required. See this for your ref:

http://www.variocanada.com/Technica.../ccpm_setup.htm
02-01-2005 Over year old.
 
 
WreckRman2
Key Veteran
Location: Indianapolis, IN

I should have said the 3 servo 90 degree swash. I imagine not all radios supports it but my JR 9303 does.

Like this:

2Ch is Aileron
3Ch is Elevator
6Ch is Collective

02-01-2005 Over year old.
 
 
WreckRman2
Key Veteran
Location: Indianapolis, IN

Some pictures... I'm mounting two servos right to the side of the fuse and for the 3rd servo I an going to cut out the frame and place it in the rear for the elevator.

Think it'll work?






02-01-2005 Over year old.
 
 
v22chap
Senior Heliman
Location: Howe, Indiana

as long as your radio supports 90 ,,,it should work really great as you have no extra weight from servo mounting hardware ...good luck let us all know how it goes...
Larry
02-01-2005 Over year old.
HOMEPAGE  
 
 
ScotY
Senior Heliman
Location: Honolulu, HI

That'll work fine.
02-01-2005 Over year old.
 
 
WreckRman2
Key Veteran
Location: Indianapolis, IN

Well the basic layout is finished. I just need to secure the servos, make a swash holder to keep it from twisting and then out it all back together.

Here is a short video clip and pics:

http://www.rchangout.com/gallery/di...e.php?pos=-3022



02-01-2005 Over year old.
 
 
dankers
Veteran
Location: Melbourne, Australia

It'll work fine - 120 deg is generally prefered because the load is alway spread to three servos in any swash movement, that' all but 90 deg is easier to pull off.

Ozace did this when the T-Rex first came out, it wasn't done very well (servos glued in with CA & the elevator servo was at at the front to avoid cutting the frames but this meant the motor could not be removed!) but as a proof of concept it worked very well.

Be interesed to know how this flies as it's the simplist and cheapest eCCPM conversion I think.

90 deg was around before 120 deg and I guess a lot of radios will support it? Be interested to know which won't - I'm sure some Logos and the Eco 8 have 90 deg 3 servo ccpm??? No 100% on this.
02-01-2005 Over year old.
HOMEPAGE  
 
 
WreckRman2
Key Veteran
Location: Indianapolis, IN

I should have an Eco 8 on my doorstep today so I'll see.
02-01-2005 Over year old.
 
 
NIM
Veteran
Location: St Louis by six flags, Missouri

once you get this up in the air give us a report on the flight characteristics. I like this setup as it is the simplest.

NIM
02-01-2005 Over year old.
 
 
helicopterMark
Veteran
Location: Rumson, NJ

Thats a nice idea, I might consider trying that as well, please let us know how it performs :-)

Mark

Mark Schneider
Team MRC/Hirobo
Turbulence D3, Evo 90, EVO 50 EX
02-01-2005 Over year old.
HOMEPAGE  
 
 
helicopterMark
Veteran
Location: Rumson, NJ

Well after spending an hour working on a 120 degree swash conversion I decided to scratch that and do 90 degree :-) now I just need to figure out how to make an anti rotation guide and pin from scratch.... any ideas?

Mark

Mark Schneider
Team MRC/Hirobo
Turbulence D3, Evo 90, EVO 50 EX
02-01-2005 Over year old.
HOMEPAGE  
 
 
v22chap
Senior Heliman
Location: Howe, Indiana

Could use the old MA type.
double ball on a long bolt on one side of the swash ,with a ball link from the outside ball back to ball mounted on an arm from the frame....This gives you a little movement back and forth but would be quick and simple ,,,depends on how you fly as to if you would like it.

good luck
Larry
02-01-2005 Over year old.
HOMEPAGE  
 
 
WreckRman2
Key Veteran
Location: Indianapolis, IN

Quote 
now I just need to figure out how to make an anti rotation guide and pin from scratch.... any ideas


That's where I'm at... I need to make a trip to the LHS to finish up mounting the servos. I'm going to use some 2/56 rod to go from one servo through the frame to the next servo. Then I plan to use some kind of bushing, most likely just a piece of carbon tubing, to hold the servo slightly off the frame. I don't want to screw them directly to the frame because the frame isn't flat in that area. I should have some more pictures tonight.

My Eco 8 didn't show up today.
02-01-2005 Over year old.
 
 
Pipeous
Veteran
Location: Surrey, BC, Canada

I used a linkage rod from my evo 50 and the thread size was the same, just screw it in and cut it off. I was doing some tinkering and found that fit nicely.
02-02-2005 Over year old.
HOMEPAGE  
 
 
ozace
Key Veteran
Location: melbourne, australia

good luck.
as danks said i did this months ago.
for the antirotation pin i removed a ball from the swash and inserted a screw, i used part of the removed mech mixing fame for the guide, as it fit the frame, just needed to cut a slit for the screw to run in.

this is the simplest conversion going but i decided it wasnt worth the effort. i dont/cant fly hard enough to trouble the stock rex and the weight saved wasnt noticable enough to justify the mucking about.

one thing i proved was it works well enough and if i could fly like danks it may have been worth sorting out more.

there are some pics on rcgroups in a thread i did back then.
02-02-2005 Over year old.
 
 
helicopterMark
Veteran
Location: Rumson, NJ

http://runryder.com/helicopter/t156716p1/

changed my mind back and went with 120 ccpm for now, still got some work to do but it is getting there, for now I am using a piece of 1/8th in balsa wood for the anti-rotation arm and a bent flybar for the anti rotation pin, fits perfect! threads right into the swashplate too! see the pics at the link above, I'll most some more pics tomorow and hopefully get a test run in,

Mark



Mark Schneider
Team MRC/Hirobo
Turbulence D3, Evo 90, EVO 50 EX
02-02-2005 Over year old.
HOMEPAGE  
 
 
rcsoar4fun
Veteran
Location: Corpus Christi, TX

Mark-
Not to be nit-picky, but isn't the geometry wrong now? The two front ball links are 1/8" further from the center of rotation than the rear one. Would it not be better to use a complete circle to make the mounting ring?

Kristopher

I am a Master of three martial arts including ninjitsu, which means I wear the special boots
02-02-2005 Over year old.
HOMEPAGE  
 
 
dnam
Veteran
Location: Herndon, VA - USA

Mark, I see the pushrods on the two front servos are at an angle, so I would suggest having the same angle at the back servo so their movements will be more syncronized.
02-02-2005 Over year old.
HOMEPAGE  
 
 
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e-Align T-REX 250-450-500-600 > Why not 90 degree CCPM?
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