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01-22-2007 12:59 PM  12 years ago
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GM1

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Tallahassee, Florida US

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Stratus 140 CCPM
I now have about 50 flights on my Stratus FAI conversion to 140 CCPM. The conversion is very simple and straight forward but does require a complete disassembly of the model. To move the bell crank pivots forward, Miniature supplied a drilling jig which bolts to the frame with existing holes to give a rigid base to work from. After drilling a 3mm hole, you rough up the surface and glue on a carbon fiber doubler to reinforce the pivot area. The pivots go through the new hole into a pem nut that is permanently installed. The aileron and collective servos are turned around and the rods are readjusted to the new lengths.
There are two machined pieces that bolt to the swashplate through existing holes and you use the same balls.
I was amazed at the difference in the swash movement with the 140 CCPM. The swashplate moves much more cleanly throughout the entire collective range with almost no observable interaction versus the older 120 where many times you could see the swashplate "dance" in rapid collective movements. That appears to be minimized and set up is greatly simplified.
Gordie
On a dog sled team, if you're not the lead dog, the view never changes.
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01-22-2007 09:58 PM  12 years ago
THX1138

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Indianapolis, IN

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Great to hear!!! Any pics? When wil it be available?

Lou
Just give me five dudes and two flashbangs...
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01-23-2007 02:40 AM  12 years ago
marc8090

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Long Island, N.Y.

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If you're not changing the upper frames then why does it need a complete disassembly of the model?
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01-23-2007 12:15 PM  12 years ago
GM1

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Tallahassee, Florida US

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Disassembly
You need to have the upper frames on a flat surface to drill the holes without delaminating area around the hole, also to keep carbon dust out of the main shaft bearings (and anything else). I used the disassembly as an opportunity to completely rebuild the model (it's two years old) with new bearings and a thorough cleaning.
I was using production prototype parts so, as far as I know, they may now already be available. I have not yet seen a price on the conversion anywhere though. Call MA in Sorrento FL and ask for a price and availablity.
I'm taking the 140 CCPM model to Clintstone's Birthday Bash in Statesboro GA this weekend for display and (FAI) demo so if you can get there, it'll be around for perusal.
Gordie
On a dog sled team, if you're not the lead dog, the view never changes.
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01-29-2007 07:13 PM  12 years ago
THX1138

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Indianapolis, IN

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Any more info on this?

Lou
Just give me five dudes and two flashbangs...
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01-29-2007 07:37 PM  12 years ago
GM1

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Pictures
I have some pictures of the conversion in my camera at home right now. If Mark still does free Mondays I'll try and load them in my gallery tonight.
Gordie
On a dog sled team, if you're not the lead dog, the view never changes.
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01-29-2007 07:45 PM  12 years ago
THX1138

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Indianapolis, IN

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Free mondays are totaly on, I can't wait to see them!!!

Lou
Just give me five dudes and two flashbangs...
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01-30-2007 02:28 PM  12 years ago
GM1

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Dang!
Sorry, I didn't get home until late last night and posting pics completely slipped my mind. I'll try and get them on as quick as I can.
Gordie
On a dog sled team, if you're not the lead dog, the view never changes.
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01-30-2007 02:35 PM  12 years ago
THX1138

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Indianapolis, IN

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Shucks...

Oh well, I'll keep my eyes open.

Lou
Just give me five dudes and two flashbangs...
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01-30-2007 03:35 PM  12 years ago
Christian

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Boston, MA

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There is a picture of it on Minair's site -> http://www.miniatureaircraftusa.com...asp?prod=0217-5
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01-30-2007 03:50 PM  12 years ago
DS 8717

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Thats for an extreme,were talking Stratus here.YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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01-30-2007 03:54 PM  12 years ago
rada70

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Westchester, NY

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how much is the difference in flight? in another word did you notice a big difference in the heli flying characteristics? thanksJust do it.
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01-30-2007 04:10 PM  12 years ago
flyboy0413

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Brookfield, CT

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I was amazed at the difference in the swash movement with the 140 CCPM. The swashplate moves much more cleanly throughout the entire collective range with almost no observable interaction versus the older 120 where many times you could see the swashplate "dance" in rapid collective movements.
Why would it dance less w/ 140 degree CCPM? All 3 servos move equal distance for collective movements irregardless of which ccpm type when there is no cyclic input.
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01-30-2007 04:17 PM  12 years ago
DS 8717

rrProfessor

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The elevator servo has to move further than the other 2 servo's.YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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01-30-2007 04:25 PM  12 years ago
flyboy0413

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Brookfield, CT

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Not for collective movements...
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01-30-2007 04:27 PM  12 years ago
DS 8717

rrProfessor

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Yes it does for all swashplate movements,because it's further away from the center of the mainshaft.DOUGYOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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01-30-2007 04:31 PM  12 years ago
flyboy0413

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Brookfield, CT

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No it doesn't. For a pure collective move, each ball on the non-rotating part of the swashplate moves the same distance. If it didn't, the swashplate would tilt
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01-30-2007 04:36 PM  12 years ago
DS 8717

rrProfessor

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Thats why 120 ccpm uses a mix to get equal travel. 140 is equal movement.YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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01-30-2007 06:09 PM  12 years ago
flyboy0413

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Whatever... Not going to argue anymore.

Anybody else want to chime in?
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01-30-2007 07:16 PM  12 years ago
Christian

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Boston, MA

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Sorry, missed the Stratus part.
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