RunRyder RC Helicopter Topic - Raptor 50v2 Trimming

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Beginners Corner > Raptor 50v2 Trimming

gvr-4579
New Heliman
Location: Lakeville, MN - USA

My Posts This: Topic Forum

Have a question for you all on flight trimming my Raptor 50v2.

When hovering or climbing the trims are all perfect.
When I decend i get a slight roll to the right.

What should i look to as the cause of this?

Thanks

10-15-2009 02:46 AM

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Pull-n-Pitch
Key Veteran
Location: Mt. Dora, Florida (USA)

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Head speed falling off too fast!
One of two things to do-
-Reset your throttle curves as to assure your as close to linear as possible.
-Re check your engine mixute and make sure your not too rich, if so when you ramp down on the throttle and into the negative pitch the engine will load up (bog).

Need some more information,
What engine?
Current Mixture settings?
Radio, Are pitch curves linear or close to linear?

Though your new here, FILL OUT YOUR PROFILE!
What it does is give us guys that are looking to answer your questions a idea of what engine, radio, fuel etc, etc, is on your Raptor...

Pull-n-Pitch

10-15-2009 03:26 AM

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gvr-4579
New Heliman
Location: Lakeville, MN - USA

My Posts This: Topic Forum

Pull-n-Pitch,
Thanks for the info, I do know my engine is a click or two rich, i also just bought a new pipe, not yet even run on the engine, and i will have to retune anyway.

It has the OS .46 in it, The throttle curve with idle up on goes 100-75-100 I believe.

I do not think my radio supports anything except a "straight" pitch curve.

I do not think that my engine is bogging and loosing headspeed in this instance.

My question was simply when decending as if i were landing, it slightly rolls to the right, no loss of headspeed there as far as i know.

Thanks much for the help.

10-16-2009 01:42 AM

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Pull-n-Pitch
Key Veteran
Location: Mt. Dora, Florida (USA)

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Next time you fly try clicking in the main needle a couple of clicks, if you have a temperature gauge to check engine temp shoot for a window of 180-200 degrees f.
If it's not the throttle curve then it's mixture....

(as long as your not bumping the cyclic over as you pull into negative)

I "personally" do not believe in the Finger to back plate test due to the fact that someone will calloused hands will be less sensitive to temps versus someone with a more sensitive feel or touch, Temp gauges are reliable and will give a temp in degrees versus the other method of "I can hold my finger on there for like five seconds"!
(Okay five seconds, but what is the engine temp in degrees?)
See my point!

Give me a PM if you get jammed up, I have a solid Raptor background and have flown (and crashed:mad

every model made except for the SE!

Pull-n-Pitch

10-16-2009 03:24 AM

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rotormonkey
Key Veteran
Location: Ottawa, ON - Canada

My Posts This: Topic Forum

If you have a roll when decreasing collective, it sounds to me like ccpm interaction. Though I believe raptors are mccpm. Could it be a problem with the geometry of the bellcranks for aileron control? Never owned an mccpm machine, so not sure..

If it's made to be idiot proof, sooner or later they'll build better idiots.

10-16-2009 02:18 PM

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2LTime
Veteran
Location: Walworth,NY

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I doubt it has anything to do with your engine tuning or headspeed. If it hovers fine, but rolls right when descending, this indicates a lateral balance problem. What does it do when climbing? when flying around? Have you balanced the heli by holding it by the flybar? How drastic is the role? Your right hand side should be heavy for some reason. If it rolls left while climbing, this would confirm it.

Jeff

If you can't learn to do it well, learn to enjoy doing it badly.

10-16-2009 03:48 PM

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Pull-n-Pitch
Key Veteran
Location: Mt. Dora, Florida (USA)

My Posts This: Topic Forum

Oh, let's see---
It wouldn't be the Full Header tank would it?

Mixture--Lean it a couple of clicks and try again---
Raptors are heavy, blade speed is life....

If you still feel it's leaning to the helo right, take off the header tank- go straight in off the main tank-- If problem stops it is the 2 ounces of fuel slinging off the right side of the helo......

Raptor Basics-101

Pull-n-Pitch

10-17-2009 03:10 AM

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gvr-4579
New Heliman
Location: Lakeville, MN - USA

My Posts This: Topic Forum

Thanks guys, hoping to get some flights in tomorrow pending the weather. The heli is balanced very close. Ill look into everything you all mentioned. I have alot of work tomorrow as i upgraded to a QuickUK tail rotor today and 92MM tail blades will have to rework the gyro setting, and had the new pipe to tune to.

Speaking of balancing i remove a huge cast aluminum pipe and went to a lighter pipe which could have had the heli trimmed to compensate for the left side weight i suppose.

When ascending it flies true as it does when hovering.

Erik

10-17-2009 04:38 AM

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Aaron29
Key Veteran
Location: Bossier City, LA

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Does it tilt suddenly to the right with power reduction and then stop rolling? Like a little disturbance for only a second?

Or do you have to hold left aileron all the way through the descent?

Like would it roll all the way over given the chance? Or does a quick left reaction at the start of the descent stop it from progressing?

-Aaron

10-19-2009 12:58 PM

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Aaron29
Key Veteran
Location: Bossier City, LA

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P.S. it isn't interaction. The Raptor has a mechanical mix. The functions are completely separated.

The only way to make the swash tilt right with decreased pitch is to have a PITCH-AIL mix in the radio. I doubt this is the case.

-Aaron

10-19-2009 01:00 PM

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BarracudaHockey
rrMaster
Location: Orange Park FL

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One of the beauties of mechanical mix is no interaction.

AMA 77227
http://www.jaxrc.com

10-19-2009 09:16 PM

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gvr-4579
New Heliman
Location: Lakeville, MN - USA

My Posts This: Topic Forum

Thanks again for the replies and suggestions. I have only gotten one chance to fly the heli since i asked for help and it was too windy to really tell if the heli was off or if it was the wind. I have been adding alot of upgrades as the weather has not permitted me to fly as much as i would like to. One thing i changed that may solve the issue is carbon blades if the wood ones were warping from load inequally.

10-20-2009 01:57 AM

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Pull-n-Pitch
Key Veteran
Location: Mt. Dora, Florida (USA)

My Posts This: Topic Forum

Keep us posted and let us know "WHAT" it was that was causing the problem.......

You got a variety of inputs on your posted question so keep us updated buddy!

Pull-n-Pitch

10-20-2009 04:51 AM

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gvr-4579
New Heliman
Location: Lakeville, MN - USA

My Posts This: Topic Forum

Will try and figure it out, and what it was. like i said i changed alot of stuff tho LOL Hoping for good flying weather soon.

10-20-2009 11:45 PM

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Brokenwing II
Senior Heliman
Location: Watertown, NY

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Yes, please keep us informed. I also have a Raptor 50 so all info is a learning curve for me.

10-21-2009 12:52 AM

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gvr-4579
New Heliman
Location: Lakeville, MN - USA

My Posts This: Topic Forum

Well i found a cracked servo tab on my aileron/roll servo. I think that was the trimming problem. Have another much bigger problem now that my elevator servo failed mid flip!

10-31-2009 04:02 PM

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Beginners Corner > Raptor 50v2 Trimming

mundo330
Heliman
Location: Holly Springs, GA, USA

My Posts This: Topic Forum

Roll interaction?

I will agree with Pull-n-Pitch. I used to fly the old Schluters and Excels and they where also heavy and under-powered. If your head speed bled off too fast it would roll to the right on decent. Keep you r head speed up and no problem. The Superiors had a very symmetrical layout and we never used header tanks in those days (not until the Shuttle with it's hidden tank did we try header tanks) so the heli was very balanced right off the bench. Plus the Raptor like the old schluters used a Mechanical collective-cyclic pitch mixing that is totally independent of one another. Interaction is impossible! Good call Pull-n-Pitch!

P.S. Sorry to hear of the mishap gvr-4579!
Hope you get up flying again soon!

Doug S.

Causality is the Root of all Life!

11-12-2009 01:51 AM

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Beginners Corner > Raptor 50v2 Trimming

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