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11-02-2004 02:27 AM  13 years agoPost 1
helitroll

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Southlake, TX

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I am fitting out my Raven 50. I have 8101s, 9250s or can transfer some 9202s. Are the 9250s too fast for the CCPM? Tx is a 10X. I know the 9252s are the best match. Ideas please.

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11-02-2004 03:38 AM  13 years agoPost 2
AGRAV8

rrProfessor

Mosquito Coast......Houston Texas

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Hmmmmmmm
9250's are not too fast....actually NONE are too fast. Remember one thing.....in a crash, servo gears are going to puke. Check the replacement costs of gear sets......

9202's do NOT seem to have an extended life in a raven 50 for some reason.

8101 specs:

Torque: 90.4 oz/in
Speed: .23 sec/60°
Dimensions: 0.75 x 1.54 x 1.36
Weight: 1.73 oz
Bearing: Dual Wide Spaced
Motor Type: Coreless
Application: Competition pattern, high-performance sport, .60 helis

Actually slower than I like......but, gear sets are $4.00.

Given the choice, for best performance, the 9250's would be my choice. 76 oz torque, .11 speed. Note, these are metal geared, but have a plastic secondary FUTM3404 that will be the sacrificial one in the geartrain.

Hope this helps.

James

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11-02-2004 06:19 AM  13 years agoPost 3
helitroll

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Southlake, TX

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Gears
James: Thanks for the input. I am currently using one of the 9250s in the tail of my Fury. I have the 8101s sitting on the shelf and would not affect any of my current birds. The best flying option is to put the 9250s on the Raven and put a new 9254 on the tail of the raven and a 9253 on the Fury. I think I'll go to bed and think about it. The LHS will be happy to see me no matter which way I go..... maybe a 601 on the Raven. The only thing I do know is that I am not messing with my Predator. I can't ask for a better flying bird.

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11-02-2004 07:12 AM  13 years agoPost 4
AGRAV8

rrProfessor

Mosquito Coast......Houston Texas

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Hear that !
heck, use the 8101's if they are not busy, and don't overlook the JR 500T with an 8700 G for tail duty.....

THAT gyro/servo does well in my P-max.........

You ARE going to be at Fall Fest, right?

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11-02-2004 01:17 PM  13 years agoPost 5
SteveH

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Texas

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I'm using JR 8101's with good success in my Falcon SE/Schweizer, my Raven, my Predator glow SE, and my Predator Gasser SE. I find them to be a good all around heli servo. However, if you are into wild, hard, rapid 3D, you will probably want something faster.

The government cannot give you anything without first taking it from someone else.

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11-02-2004 10:06 PM  13 years agoPost 6
beavis1

rrKey Veteran

New York state

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Servo speed
The other note worthy thing is the servo travel with those long Metal century servo arms means the servo travel actually is less than that of other helis. So a servo with a speed of .20 seconds stop to stop when actually traveling only 2/3 of its travel (thats about what I use for -10 to 10) would have a speed of .13-.14 from end point to end point

That is why even slower servos fly so well in the design !!!

I over did it myself with hitec 5925 servos .08 with 105 torq. hella Scary fast is an understatement !! Way overkill..

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11-03-2004 01:15 AM  13 years agoPost 7
RICH.L

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gentry arkansas

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i was thinking about getting hitec 645 dual bearing servo's for my raven fifty,would that be o.k.?
i am not into any major 3d,hope to be into some mild 3d next year(weather and guts permitting)
rich

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11-03-2004 03:23 AM  13 years agoPost 8
Trace

rrApprentice

Wildwood, MO

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Rich,

You don't need 100+ oz-in servos on the Raven. Right now I'm running HS-545's(~60 oz-in, 6 micro-second dead band width) with no problems and people have flown them with even weaker stuff.

If I had it all to do over again I would look very seriously at the new HS-6635HB (~70 oz-in,$48 each) or the HS-5475 (~60 oz-in, $35 each) digitals.

The 6635's have a dead band width of 2 micro-seconds, most servos have a dead band width of 8 micro-seconds including a lot of digitals.

Based on the specs that 6635 digital is a smoking deal for $48. YMMV

Trace

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11-03-2004 06:17 AM  13 years agoPost 9
helitroll

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Southlake, TX

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They're in
Thanks for the input. I sat down to put in the 8101s since they were sitting on the shelf. I turned around and I had 9250s on the cyclic/CCPM, 8101 on the throttle and 9253 on the tail. I hope I can keep up with it. I have no idea how that happened. I hope to fly it this weekend. I was shooting for tomorrow but it is a little late. Mark

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11-05-2004 01:47 AM  13 years agoPost 10
jackheli

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Vancouver - Canada

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AGRAV8,
9202's do NOT seem to have an extended life in a raven 50 for some reason.
Where did you get this information from? Needless to say I have 9202's on my Raven...

Thanks.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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11-05-2004 05:00 AM  13 years agoPost 11
helitroll

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Southlake, TX

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Gyro location
I will start with a 401 Gyro that seems to fit in the recess just in front of the start shaft. Is there too much vibration to run the 401 there? Should I mount it on the radio tray instead?

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11-05-2004 12:01 PM  13 years agoPost 12
SteveH

rrProfessor

Texas

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The 401 will WORK fine there, but everytime I checked that location, it appeared there was not enough room horizontally to adequately vibration isolate the gyro.

The government cannot give you anything without first taking it from someone else.

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11-06-2004 06:55 AM  13 years agoPost 13
helitroll

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Southlake, TX

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horizontal room
I will find out in the am. My 401 had play Rt left and fore - aft with room left over for some padding if I wanted. It is not touching anything and hopefully will be ok. My only problem now is whether to take a before picture. How do you put on a governor? It looks like optical may be the only way. Mark H.

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11-06-2004 07:56 AM  13 years agoPost 14
Eco8gator

rrElite Veteran

Palm Beach, FL

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Hello

I use 9202's in my Pred 90 and let me tell ya....Im not exactly hovering this beast All I know is if it works in my Pred it will defintally work in a tiny Raven. Granted there are better choices I know this will work reasonably well.

Carlo

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11-06-2004 10:25 PM  13 years agoPost 15
jackheli

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Vancouver - Canada

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Eco8gato,

Before pushing my 9202's to my Raven I also had them in my Pred. I upgraded my Pred to 9252's but not because I wasn't having a ball with the 9202's.

I wonder were this came from...

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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11-07-2004 03:59 AM  13 years agoPost 16
helitroll

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Southlake, TX

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Results
I think any of the 3, 9250, 8101, or 9202, would have been ok. I got 5 flights on the Raven today with the 9250s. I tried some flips and rolls on the 3rd flight. I was up pretty high due to a planker flying thru our area. What I thought was interaction was actually my inputs on some very fast servos. It was fine when I brought it down and could see. My pitch curves need some work as I was dropping my head speed a little. I am used to a governor but can't figure out how to put one in the Raven. I think an optical with a black line on the clutch housing might work. I just don't know about the contrast requirments on optical sensors. Autos were fine but not much reserve in totally calm winds. I think the gain on my gyro was too high and may have taken away some of the energy. I did have to upgrade the tail rotor blades to get the tail to hold. I appreciate the input and will leave the 9250s in for now. I may actually have to learn how to program Expo on my transmitter. I look forward to flying her tomorrow. I want to see how bad my inverted looks when all my mistakes show up immediately. It's time to learn or burn. mark

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11-07-2004 05:34 AM  13 years agoPost 17
jackheli

rrProfessor

Vancouver - Canada

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Helitrol,

I had no problems fitting a governor in my Raven.

Are you having trouble with the magnets? I simply drilled two slots in my fan and epoxied the magnets in.

As a matter of fact, in my old Falcon, I used to have a Helimax governor that required three magnets in the main gear! It was a pain to get the slots drilled exactly 120 degrees apart...

I am planning on taking the engine off tomorrow if the weather is bad. Would pictures of the magnet and the sensor setup help?

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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11-08-2004 04:52 AM  13 years agoPost 18
helitroll

rrVeteran

Southlake, TX

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Governor
That would be great. The fan sits on top of the clutch and in the shroud. It flew fine with just the curves but I would like to put in a governor if I can figure out a way.

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11-09-2004 02:53 AM  13 years agoPost 19
jackheli

rrProfessor

Vancouver - Canada

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Helitroll,

Check my gallery for pictures of my governor setup:

My Gallery

Start by trying different drill bits and different depths of holes on scrap plastic. This will give you the feel of how much material to remove with the drill. Mark dummy places with a permanent marker and then make guides with a pointed tool. Make sure you are comfortable on the scrap before you proceed into the real thing.

Mark where the magnets will be placed on the fan (check the governor's documentation for the right radius). Make sure they clear the clutch bell and that the sensor can be placed properly. TAKE YOUR TIME! Put one magnet facing up and one facing down, so only one of the magnets will be active.

Glue them down with epoxy 24 hours.

I also drill a 1/16 hole completely through in the middle of the larger hole to give more grip to the joint. It also helps if I ever need to remove the magnet. But that is just me.

Make sure you balance the fan after the glue is dry.

Jack

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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11-09-2004 06:34 AM  13 years agoPost 20
helitroll

rrVeteran

Southlake, TX

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Governor:
Jackheli: Thanks for the photos. I will use that info to get a governor installed. I will probably wait for winter maintenance and put as much time as I can on it for now. I run governors in all my birds but have curves that work in case of sensor failure. This will give me a chance to practice tweaking my curves. Wed is my next flying day. I'll keep you posted. I will do the tail mod Wed night. Mark.

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