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How to work the pitch gauge?

Chavalo

Senior Heliman

Mexico City

Ok, I know this may sound stupid, but I donīt know how to work the pitch gauge! I got the robbe one and the instructions SUCK!! I canīt understand anything and I've been doodling with the gadget and can't figure it out. (Oh...I don't have any experts around to ask and I would rather learn by myself...I think it's better this way)

If someone knows if there is a link with pictures or diagrams which explain how to work these things, I would appreciate....or a step by step follow through would be thankfuly welcomed!

Thanks a lot in advance!!

09-18-2003 Over year old.
raptor30dude

Veteran

Altha, FL

I have a Heli-Max Gauge and all i do is Allign the top of it with the flybar. Thats how I do it. But the Robbe is different I think i think theres a little thing u do with it ur sum crap. Im not sure.

09-18-2003 Over year old.
spurry

Veteran

Reading, UK

Hi,
  • Set the gauge up as shown
  • Alter the length of the flybar2boom rod until the little bubbel gauge on the flybar shows it to be exactly level.
  • Then you can take the readings off the display and play with your pitch curves.

Hope that helps you out and good luck, James

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09-18-2003 Over year old.
HOMEPAGE  
spurry

Veteran

Reading, UK

S##T, sorry. You said Robbe and I read Robbart. Too many Fosters!!! Not sur eabout the Robbe one either . Ah well, that might help someone out.

James

09-18-2003 Over year old.
HOMEPAGE  
Chavalo

Senior Heliman

Mexico City

well, I think this robbe gauge was design for when flybars were on top of the blades, but anyway, if theres is anyone that could help with the robbe gauge, I would appreciate.

09-18-2003 Over year old.
raptor30dude

Veteran

Altha, FL

I think all guages work both ways.

09-18-2003 Over year old.
ShuFly

Senior Heliman

San Diego, Calif.

I'm in the same boat...the Mavrikk pitch gauge didn't even come with instructions. That line level in the pic looks like the ticket.

09-19-2003 Over year old.
Thumbpilot

Senior Heliman

Navan, Ireland

Spurry,

Where did you buy your Robart? I've been searching various web sites with no luck. Only place seems to be tower hobbies with a $20 delivery charge and lead time of 30 days to 6 weeks.

09-19-2003 Over year old.
spurry

Veteran

Reading, UK

I picked mine up second-hand. I've just done alot of searching and realised you can't really get hold of one easily. Here's some sites:

Sussex MC
Stick Time
King RC

Even though SMC is out, if you pop them email you may be in luck. Just depends if they update their website often. I've found Tower Hobbies to be ok and even though they told me an item was out of stock I received it in about a week and a half. Good luck in your quest.


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09-19-2003 Over year old.
HOMEPAGE  
spurry

Veteran

Reading, UK

hi again, shoot JPA2002 a PM, I just found one in his gallery for sale.

James


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09-19-2003 Over year old.
HOMEPAGE  
Thumbpilot

Senior Heliman

Navan, Ireland

Thanks Spurry - you da man!

09-19-2003 Over year old.
choppertime

Senior Heliman

Virginia Beach, VA

I don't know what the Robbe pitch gauge looks like maybe you could post a picture. I have never seen a pitch gauge that wasn't self explanitory. With the old xcells they had this little fly bar lock to hold the fly bar level while you make adjustments. As you can see from the Robart pitch gauge it uses a rod that attaches to the tail boom and a bubble level to get it exactly level. There are other ways to get the fly bar level but if there is someone near by just have them hold it level. I can sight a fly bar easily by looking at it with my super calibrated eye balls and know when it is level. Once that's taken care of just put the pitch gauge on one of the blades near the tip and adjust it till it is level to the flybar using your own super calibrated eyeballs. What ever the gauge reads that's your pitch on that bade. Not difficult at all.

BTW, it is not necessary to view the flybar on a level plane. You may look down over top of the pitch gauge to the fly bar no matter how low the fly bar is.

Mike

_____________________
See ya at the flying field...

10-28-2003 Over year old.
dkshema

rrMaster

Cedar Rapids, IA

Hey kids ---

It's really simple.

Let's say you want to set +5 degrees, for example.

Set your transmitter pitch control to the point where you want the +5 degrees setting to happen.

Find a way to hold the flybar level. I made a simple fixture using two pieces of telescoping brass tubing, one inside the other. The larger diameter piece is epoxied into a block of wood to act as a base. The smaller diameter piece of tubing has a smaller piece of aircraft plywood epoxied on top, parallel to the base. The telescoping tubing allows you to adjust the length of the fixture.

Position the rotor blades so that one of them is pointing forward. Take the fixture that I described above, set it beside the heli. Extend the brass tubing until the small plywood platform touches the bottom of one of the flybar paddles. I use a small rubber band (#32) to tie the paddle to the plywood platform. Adjust the length of the telescoping fixture until the flybar is level.

Set the desired pitch (in this example, +5 degrees) on the gauge. Slide the gauge onto the rotor blade that is pointing forward, about midway down the blade. Make sure your swashplate is level, and that the transmitter pitch control stick is at the desired position.

Now, simply sight down the top of the pitch gauge toward the flybar. The top surface of the pitch gauge should be parallel with the flybar (that is currently held level by the fixture).

Adjust your pitch curve on the TX until the flybar and top surface of the pitch gauge are parallel.

For negative pitch, set the gauge to the desired negative setting, put the control stick into the desired position, and again, adjust the pitch curve to get the top of the pitch gauge and the flybar parallel to each other.

Make all the pitch settings using the same rotor blade at the same forward position, flybar level, swashplate level. Set all the desired pitch/control stick settings that you need or desire.

At this point, all of your pitch curves have been set up with reference to the flybar, and the same rotor blade, and with a level swashplate.

As a last step you need to check the other rotor blade. If all of your linkages are properly set, it should mirror the pitch of the other blade -- at all settings.

To check the other blade, set your transmitter to the point where earlier you set your zero pitch setting. Double check using the gauge that you are indeed still reading zero degrees pitch on the reference blade at this setting. Then, rotate the rotor head 180 degrees so that the other blade is now pointing forward. Use the fixture to level the flybar again, and put the pitch gauge on the rotor blade, again about halfway down the blade.

If everything has been assembled and set-up correctly, the other blade should also be reading zero degrees. If it isn't, then you need to adjust the linkage so that it does (both rotors show zero degrees at the zero degree setting). This adjustment is usually made by adjusting the length of the short control rod that connects to the blade grip pitch lever. This last step should make blade tracking pretty close to being dead on prior to ever firing up your engine.

Now that you've got the pitch curves set, and both blades are set to zero pitch at the zero pitch setting, you should be ready to go fly and fine tune the heli.

Dave


The Robbe gauge works well. I've got one (actually an old Schluter) that I've had for nearly 25 years, and it still does the job.

10-29-2003 Over year old.
Chavalo

Senior Heliman

Mexico City

Got It!!!

Well, I finally got it, just level the bottom edge of the gauge with the flybar and take your reading...it's as easy as that. I don't know if my readings are +/- 1š accurate but the heli is flying just fine and my pitch curve is working for me fine.

Thanks to all of you!!

10-29-2003 Over year old.
Marty

Senior Heliman

Australia

Is it necessary to have the flybar level as it seems the flaybar parallels the blade pitch ie. when the flybar is down on one side, the linkages drag the blade pitch down the in same direction and amount of pitch.
Therefore since you are using the flybar as the datum for blade pitch, should it make a difference if the flybar is not level??
I am wondering because I dont have a tool to mecanically keep my flybar level during set up and just let it hang where it wants too because of the flybar/blade pitch parallel effect. The datum moves in harmony with the item measured. Am I still in the ballpark with this method??
Thanks.

10-29-2003 Over year old.
dkshema

rrMaster

Cedar Rapids, IA

Keeping the flybar level makes life easier. It's a lot easier to sight a horizontal or vertical line than one at some weird angle. And it cuts way way down on the amount of time it takes to set up your heli.

You can build a fixture for a couple of bucks...some people use a stiff piece of wire and a couple alligator clips.

Dave

10-29-2003 Over year old.
Chavalo

Senior Heliman

Mexico City

Fly bar problem

Well, forgot to mention that! What I did is used two sticks (same size) to keep the flybar at 0š or paralel. Just rest one of your sticks on the left paddle and the other one on your right paddle. Make sure that both sticks are exactly the same and use a level to make sure your flybar is at 0š since sometimes your work table is not that even or maybe your left skid is different than your right skid. If your level doesn't read 0š, use pieces of paper to wedge your sticks. What you're doing is simulating a Robart pitch gauge....the rest is explained on my last post. It worked for me fine so it should work for you.

10-29-2003 Over year old.
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How to work the pitch gauge?

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