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Search: Posts Made By: ralfhofm
Showing results 1 to 25 of 25
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Forum: Century - Predator, Hawk IV, Falcon, Raven
07-09-2003, 10:18 PM
Replies: 7
Views: 1,091
Posted By ralfhofm

check thrust bearings!

I had a similar problem a while ago in my Raven 50. It turned out that I had assembled the thrust bearings in the tail grips backwards.
If one does that, everything seems nice and smooth on the...
Forum: RC Helicopter Beginners Forum
03-03-2003, 11:50 PM
Replies: 6
Views: 627
Posted By ralfhofm

Raptor Tail Wag Help!!!!!!!!!!!!!

I had a similar problem with my Century Raven, it seems. I'm not familiar with the Raptor, but in my case I installed the thrust bearings in the tail rotor grips backwards. That causes the grip to...
Forum: RC Helicopter General Discussions
02-25-2003, 09:15 PM
Replies: 5
Views: 615
Posted By ralfhofm

Raven 50 CCPM - New look!

NICE canopy! I want one :)

I have a Raven 50 and am very happy with it. The mechanics are solid and there are a lot of metal parts where other kits only sport plastic. The kit was complete, but...
Forum: RC Helicopter General Discussions
02-24-2003, 07:04 PM
Replies: 2
Views: 410
Posted By ralfhofm

auto-rotation bearing question

CJ,

thanks for the advice, I'll be sure to keep the grease away!

It turns out that my weird tail wagging problem was caused by the thrust bearings in the tail being installed backwards. That...
Forum: RC Helicopter General Discussions
02-24-2003, 01:31 AM
Replies: 12
Views: 1,403
Posted By ralfhofm

transmitter tray

Thanks Lee,

I have my hands full trying to appear in control of my heli, so the cup holder is not an essential item for me at this point :D

I haven't really decided if a tray is the thing for...
Forum: Century - Predator, Hawk IV, Falcon, Raven
02-22-2003, 08:05 PM
Replies: 0
Views: 876
Posted By ralfhofm

To grease or not to grease...

Hi all,

this may seem like a silly question, but should the auto-rotation bearing be greased or should it be dry ?

I have a Century Raven 50 with an OS46FX-H, and it exhibits some tail...
Forum: Batteries & Chargers
02-22-2003, 02:04 AM
Replies: 3
Views: 541
Posted By ralfhofm

TRITON - Output Voltage

With a long charging lead and thin wires it's pretty easy to get a 1V drop over the charging lead. I think that's what you are seeing.

Resistance = Voltage / current = 1V / 1.4A = 0.71 Ohms

If...
Forum: Batteries & Chargers
02-22-2003, 01:26 AM
Replies: 3
Views: 541
Posted By ralfhofm

TRITON - Output Voltage

The nominal voltage of a NiCd cell is 1.2V. During charging, that cell voltage usually peaks at about 1.65V or so.
During discharging, the cell voltage drops to about 1V - 1.1V, depending where the...
Forum: RC Helicopter General Discussions
02-21-2003, 08:39 PM
Replies: 2
Views: 410
Posted By ralfhofm

auto-rotation bearing question

Hi all,

this may seem like a silly question, but should the auto-rotation bearing be greased or should it be dry ?

I have a Century Raven 50, and it exhibits some tail wagging which seems to...
Forum: RC Helicopter General Discussions
02-05-2003, 08:06 PM
Replies: 12
Views: 1,403
Posted By ralfhofm

transmitter tray

Looks pretty neat but seems to be on the heavy side with all that aluminium...
Do you have to take the shoulder straps off everytime? Seems to me a neck strap is by far less bulky.

Ralf
Forum: RC Helicopter General Discussions
02-05-2003, 02:40 AM
Replies: 12
Views: 1,403
Posted By ralfhofm

transmitter tray

I was just wondering where to find a decent transmitter tray. I would like to try one, but haven't been able to find one...

What are you thumb-and-finger guys out there using?

Ralf
Forum: RC Helicopter General Discussions
02-02-2003, 09:46 PM
Replies: 11
Views: 1,015
Posted By ralfhofm

GY401 set up questions

Glad to be of help! It took me about 3 month of literally chasing the tail and upgrading this and that until I figured out it might be the engine tuning. (it sounded ok to me...)
A lot of folks...
Forum: RC Helicopter General Discussions
01-29-2003, 09:29 PM
Replies: 11
Views: 1,015
Posted By ralfhofm

GY401 set up questions

I just went through a lot of experimenting with my Raven50, it seems that in my case the hunting was at least partially caused by engine roughness. See if fine tuning your engine settings helps.
...
Forum: Century - Predator, Hawk IV, Falcon, Raven
01-28-2003, 06:18 PM
Replies: 21
Views: 1,705
Posted By ralfhofm

Raven50 - GY401 AVCS problem

Alright, seems like I've been chasing the tail (pun intended), when it appears to be an engine tuning problem...
I worked on the mixture and needle settings, and things have improved quite a bit....
Forum: Century - Predator, Hawk IV, Falcon, Raven
01-26-2003, 07:37 PM
Replies: 21
Views: 1,705
Posted By ralfhofm

Raven50 - GY401 AVCS problem

Thanks for all the input! I took the engine and clutch apart yesterday, looks fine to me. it's worn evenly and not excessively.

One thing about the auto hub. I have the stock version which I...
Forum: RC Helicopter General Discussions
01-25-2003, 10:42 PM
Replies: 11
Views: 1,015
Posted By ralfhofm

GY401 set up questions

Does the hunting change in amplitude as you change the gain setting?
I have a hunting problem as well and can't figure out the source. Please let us know if you find your problem!!
Forum: Century - Predator, Hawk IV, Falcon, Raven
01-25-2003, 06:10 PM
Replies: 21
Views: 1,705
Posted By ralfhofm

Raven50 - GY401 AVCS problem

It sits on a wooded platform that is bolted to the frame.

Could a slipping clutch cause the tail wagging?

Ralf
Forum: Century - Predator, Hawk IV, Falcon, Raven
01-25-2003, 12:04 AM
Replies: 21
Views: 1,705
Posted By ralfhofm

Raven50 - GY401 AVCS problem

It's up front on a small tray. I attached a picture.
Forum: Century - Predator, Hawk IV, Falcon, Raven
01-24-2003, 09:48 PM
Replies: 21
Views: 1,705
Posted By ralfhofm

Raven50 - GY401 AVCS problem

Well, that Predator IS a VERY nice looking machine. Maybe I should start from scratch with a new one...

I just got back from the field after replacing the torque tube. I didn't get a free...
Forum: Century - Predator, Hawk IV, Falcon, Raven
01-24-2003, 12:11 AM
Replies: 21
Views: 1,705
Posted By ralfhofm

Raven50 - GY401 AVCS problem

Hi Payton,

I just took the tail apart last night, major problem with the torque tube. I can wind it up half a turn ....

I just got back from Century, I'm going to replace the tube tonight....
Forum: Century - Predator, Hawk IV, Falcon, Raven
01-22-2003, 11:16 PM
Replies: 21
Views: 1,705
Posted By ralfhofm

Raven50 - GY401 AVCS problem

Hi Andy,

thanks for the reply. The Raven does have the carbon tail drve, but there is still quite a bit of flexture which could lead to the tail rotor winding up. But the drive train is running...
Forum: RC Helicopter General Discussions
01-22-2003, 09:44 PM
Replies: 1
Views: 380
Posted By ralfhofm

CCPM servos

What servos are god for a CCPM Raven50?
- Digital or is analog ok?
- metal gears or nylon?

I started out with the S9001's that come with the 9CHP, but they have quite a bit of play in the gears....
Forum: Century - Predator, Hawk IV, Falcon, Raven
01-22-2003, 09:21 PM
Replies: 21
Views: 1,705
Posted By ralfhofm

Raven50 - GY401 AVCS problem

Thanks for al the suggestions, here is what I'm at right now:
- changing the ATV to 70% doesn't make a difference
- the tail hunting is getting faster and smaller in amplitude when the gain is...
Forum: Century - Predator, Hawk IV, Falcon, Raven
01-20-2003, 07:52 AM
Replies: 21
Views: 1,705
Posted By ralfhofm

Raven50 - GY401 AVCS problem

I have gyro problem with a Century Raven50. The tail has a 9253 driven by a GY401, radio is a 9CHP.
In AVCS mode, the tail oscillates in hover (I'm just starting out, no flying around yet...).
The...
Forum: RC Helicopter General Discussions
01-20-2003, 03:24 AM
Replies: 10
Views: 800
Posted By ralfhofm

9253 Problem ?

If you run the servo test with the remote gain connected, the gyro switches from normal to AVSC mode as the gain channel cycles through. That causes the irrate tail servo behavior.

Ralf
Showing results 1 to 25 of 25


 
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