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Audacity Models Pantera 50 - Tiger 50 > Tipsey Tiger

rotaryfalcon
Heliman
Location: Social Circle, Ga. USA

I just recently finshed and test flew a Tiger .50. When spooling up the first time at about half hover speed I tested the response of the cylic controls, strangely the stick responses were out of phase. Back or forth movment caused side to side rotor tilt and side to side caused fore and aft response. At that point I headed home to see what was up. I really couldnt find anything wrong. Gave it another shot and once close to hover speed is reached the responses are normal, Hover and FF are perfect. I have a Raptor .30 and two 450 helis also on this TX, a DX6i with no problems. I am mystified as to how it can change with head speed!! Any clues?

06-04-2008 09:54 PM

bclong211
Senior Heliman
Location: Columbia ,SC

it is your servo channels or it is your swash mix in the radio programming. Sounds like it is simple though. Check the manual for designations for the servo- I know the front one is elevator but I can't remember which is which-pitch or ail on the two sides. What kind of radio are you using?

I meant to do that!!!

06-05-2008 12:35 AM

bclong211
Senior Heliman
Location: Columbia ,SC

Sorry - just saw you have a dx6. Be sure you have it on 120 deg ccpm for swash mode.

I meant to do that!!!

06-05-2008 12:36 AM

rotaryfalcon
Heliman
Location: Social Circle, Ga. USA

What is crazy about it is that every thing is traveling in the right directions. Left aileron swash moves left, right to right, fwd stick tilts fwd, rear stick rear. Once the head is at speed all is normal it hovers and flies great. I have set up the other three helis on the DX6i with no problem. I fly the Tiger almost daily, I just leave it alone until it is ready to lift off.

06-05-2008 01:07 AM

rotaryfalcon
Heliman
Location: Social Circle, Ga. USA

Hey all, thanks for the responses, I think we can put this one to bed, but first I want to clarify that this in no way reflects on the Tiger. I think it is a great heli! I guess I am an advanced noob and approach the test flight of a new heli cautiously. I would no doubt have never noticed it if I had just spooled up to hover speed checked the responses and took off. Once I get basic aerobatics down I intend to move to a Pantera. John has been great with his support, when you find great people with killer products, why do business any where else?!

06-05-2008 04:10 PM

xtremeaerosport
Heliman
Location: Lewes, DE

Dude, it still sounds wrong. Even with the engine off, rotors stopped, the swash should move the same direction as the stick does. If it works when the bird is spooled up, but not when you are coming up to speed, that just don't sound right.

Forward stick should equal forward tilt of the swash if the rotor is spinning at 20 RPM or 2000 RPM.

Jon

CPT Jonathan Ott
US Army

06-09-2008 09:55 PM

steve9534
Key Veteran
Location: yakima, wa.

Gyroscopic precession

The inputs to the rotor head precede by about 90 degrees the actual effect of the input. The swashplate should tilt the same direction as your stick inputs, but the input to the main blades will occur ~90 degrees ahead of their actual effect so that a roll cyclic input will change the main blades pitch when they are aligned with the long axis of the heli and a fore/aft input will change the pitch when the blades are perpindicular to the long axis. The effect of the input is felt later in the rotation of the blades, a phenomenon called gyroscopic precession. The amount of precession is determined by the number of blades, dampner stiffness, head speed, and a thousand other things I only dimly comprehend. I doubt anything is wrong with your heli if it responds normally once up to speed and what you're seeing is just a change in the precession angle as the head comes up to speed. Hope this helps. steve.

06-09-2008 10:09 PM

Heli_Man_Bob
Heliman
Location: Miamisburg, Ohio, US

I think steve9534 is right on rotaryfalcon is not talking about the swash he is watching the visual disk created by the spinning blades.

Rotaryfalcon correct me if Im wrong but your swash plate is always moving in the correct direction and you were speaking of the blade or rotor disk response being different a low head speed vs flight ready rpm.

Bob

06-09-2008 11:32 PM

rotaryfalcon
Heliman
Location: Social Circle, Ga. USA

Hey, yeah that is correct, the swash never moves in the wrong direction. It seems that at the lower head speeds maybe the control inputs are out of phase, ocurring later than they should. it would appear that they are 90 degrees out at lower speeds. The heli would never fly at these speeds, but it has enough authority to tip it on its skids.

06-10-2008 02:49 AM

Wedge77
Heliman
Location: St Louis Missouri USA

I asked basically the same question last month. When I moved the stick forward, the rotor tilted forward and to the left about 45 degrees. I was told it was ok and it was, she hovers perfectly.

06-20-2008 04:35 AM

rotaryfalcon
Heliman
Location: Social Circle, Ga. USA

Yeah, it is OK and it flys great. Just a little idosyncricy of a particular heli. I tried to get my Raptor to do similar and we tried a Rex 600N yesterday, they wouldnt do it. I have actually had some fun with unsuspecting people, by getting them to spool it and check controls, then flying it after they believe something is wrong. You outa see em run to get behind the prep tables!