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10-12-2005 04:44 AM  13 years agoPost 1
Rum95

rrApprentice

Puerto Rico

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Hi;

I’m learning how to setup the radio, but I’m still having problems with the pitch curve. I understand the theory behind it, but I don’t get the actual setting of it on the radio. I have this little pitch gage that came with the heli(0,3,7), but I’ve seen some examples of normal pitch curves and it all seems kind of arbitrary in terms of starting(%) and ending point(%). Can somebody explain it to me like I was a five years old?

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10-12-2005 08:40 AM  13 years agoPost 2
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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- set up the heli mechanically so you get the max throw you will need eg -10 degrees to +10 or +12, or if its a small electric heli you may only be able to get 14 degrees max throw, so -7 to +7
- this should be with your throttle end points (ATV) equal and around 100 or more
- then change the pitch curve settings to give you the pitch you want at the different stick settings eg
0 degrees at bottom stick (suggest you have -1 or -2 degrees)
3 degrees for hovering (this is for a small electric heli, ic helis hover about 5 degrees)
- 7 degrees at max stick, again this is for a small electric heli, ic helis max at about 10 degrees.

In a symmetrical setup as described above, 0 degrees will equate to 50% on the curve, 3deg about 70% and 7deg about 100%

Edit: I see its a zoom/shogun, so for learning I would go for -2, 3, 7 or similar pitch curve, and max -7 to +7 mechanical setup.

Let me know if that helps

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-13-2005 04:07 AM  13 years agoPost 3
rcnut2

rrNovice

Canada

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As Dr. Lodge pointed out, the helicopter needs to be setup mechanically first before additional fine tuning of the radio to achieve your normal and stunt flight modes.

Begin by setting pitch curve linear from 0% to 100% (5-point curve: 0,25,50,75,100). This will move the collective servo through its full range when the collective stick on the radio goes from bottom (0%) to mid stick (50%) to top end (100%). At mid stick, the servo arm should be horizontal. This ensures that you will have equal travel on either side of mid stick. Now move the stick to the top end and note the servo arm moves away from horizontal. Next place your pitch gauge on the main blade for 7° and move the pitch lever joint set until you get your 7°. At that point bring the collective control linkage along side the collective servo arm to determine which hole lines up with the end of the linkage and place linkage into that hole. This ensures that you have the right amount of lever arm on the servo to move the pitch to 7° top end. Flip the pitch gauge around and place on 7° again to check -7° and move stick to the bottom. This should be close. Some adjustments may be required to get this. Eventually you’ll get it and note too that at mid stick, the pitch should be 0°.

Now change the lower two points of the 5-point pitch curve in the radio. The first point should be entered (>0%) to obtain -2°. This could be around 36%. To make the pitch curve linear still, take the difference between the first point and the mid 50% point, divide it by 2 and add it to the first point to get your second point. For example, 50%-36%=14%. Half of that is 7% and add it to the 36% to get 43% which will be your second point.

This technique of setting up the helicopter in this manner gives best results for switching in and out of stunt mode because in stunt mode the pitch curve is the same above 50% and if you are hovering at just above mid stick in normal and switch to stunt, you won’t see any change in head rpm or pitch, provide your throttle curves are also the same above 50%.

Sorry for being so long winded. Hopefully I didn’t confuse you any further. Good luck!

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10-13-2005 11:41 AM  13 years agoPost 4
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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That's all good stuff.

When I first started with helis I read all the books and worked out in my head what I was trying to achieve both mechanically and electronically. I generally have a nearly-summetrical mechanical setup as I like to run -10 to +12 degrees where I can (on the i/c helis) so the 0% point tends to be approx +1 degree. But if you understand what you're aiming for, you can then appreciate why your setup may not be exactly according to the letter, and whether that difference matters.

Ray's helicopter manual is a good read even if alot of it is outdated. I read some sections many times until I understood both what it was saying, and importantly, why it said it.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-16-2005 04:34 AM  13 years agoPost 5
Rum95

rrApprentice

Puerto Rico

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Hi guys;


First thanks for the explanation, now I really understand setting the pitch curve.
So I was setting the 7,0,-7 degrees, and I used the end point adjustments to set the low and high point. Do I have to factor in these adjustment when calculating the pitch curve or does the radio uses my end points as the max and low of pitch travel?

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10-16-2005 05:25 PM  13 years agoPost 6
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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Do I have to factor in these adjustment when calculating the pitch curve or does the radio uses my end points as the max and low of pitch travel?
Not sure I understand what you're asking...

The end points on channel 6 should be equal and give you -7 and +7 degrees pitch, lets say you set your Tx with end points equal to 120 each side to achieve this.

Now you go into your pitch curve settings, and with a pitch blade, setup your curve % points so that you have -2 degrees at bottom stick, +3 degrees at mid stick and +7 degrees at top stick.

The end points on the radio will give you the max and min pitch on your heli at 0% and 100% on the pitch curve respectively.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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