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HelicopterMain Discussion › Anyone got a JR XP662 radio?
10-19-2004 09:18 PM  13 years agoPost 1
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rrNovice

South Wales

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Hi all,
Does anyone have a JR XP662 Radio?

The reason I ask is because I have fitted a new OS 32 engine to my heli (Shuttle z) and yesterday one my first flight with the new engine I had a spot a bother. Check out my post from last night:

http://runryder.com/helicopter/p1023246/#p1023246

Having checked my pitch curves thaey are as follows: 0,2,9 and from what I know theses are correct for basic hovering.

Anyway, I was looking at Raptor Technique website and they recommend to to set the throttle 'Trv Adjust' to +80 & -80. When checking my radio I discovered that mine was set to +150 & -150.

Firstly what does the TRV Adjust do and also would having mine set to +150 & -150 cause my heli to go shooting off into the sky at about 100 Mph?

I was just wandering what you guys who have a JR XP662 radio have your Trv Adjust set to?

Thanks for any info guys.

.A.

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10-19-2004 09:24 PM  13 years agoPost 2
blockatvalpo

rrKey Veteran

Reston, VA

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I dont have that radio, but I think i can help you out. I would set the Throttle all too 100% Trv Adjust. This way you have a little room to play. At 150% it is giving the most throw that it can give. It wouldn't shot anywhere, as long as throttle is set up right. Down should be idle and up full power. If that is wrong then it will go up. I have the 8103 and my throttle is set to different probably 80 and 75. I know not completely linear. Whatever you take off the top has to be taken off the bottom. Just remember that. Play with the throttle curve to get the best throw. You don't want it to bind. If you can hear the servo turn down the throw (travel adjustment) Hope that helps if not post again and we will get you squared away.

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10-19-2004 09:26 PM  13 years agoPost 3
SPB

rrElite Veteran

Athens - Greece

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Ask from someone more experienced to help you.

In a few words the travel adjust increases or dicreases the end points of the servo. The travel adjust of servo is ideally with the same values ie 80 for both ends.

If yours is 150 that means that your servo uses all the available travel limits for both sides. You should reduce it to get a faster response but that means that a readjustment should be made in the throttle link as well this is why I am telling you to ask from a more experienced pilot to help you.


Sotiris
myhelis.com Flying Team

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10-19-2004 09:47 PM  13 years agoPost 4
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rrNovice

South Wales

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Hi Guys,

Thanks for the great info. As I mentioned, yesterday my heli went shooting off into the air really fast - but this may just be because of the new engine and the extra power it has over my old os.28

Anyway, I will try adjusting the sero travel to +100 & -100 amd see how it goes!

I jst got a really big scare yesterday and I just want to make sure I get everything set correctly before I try my heli again. More for a safty pint of veiw than through fear of crashing (but I don't want to crash either!!)

Thanks and I will post back in a few days with the results of my next flight!!!!


.A.

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10-19-2004 09:48 PM  13 years agoPost 5
blockatvalpo

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Reston, VA

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Make sure your throttle is set up right. Please get some help. If it shoots up on start-up you'r hosed.

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10-19-2004 09:53 PM  13 years agoPost 6
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rrNovice

South Wales

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Hi,
It didnt shoot off on start-up, it shot off when the throttle was just over 3/4 stick.

I know this is the normal stick position for hovering, but the speed at which the heli took off was way way faster than when I had my old engine fitted in the heli!

I first thought my pitch curve was incorrect but checked that and it is fine (0.5.9) that is why I tought that maybe the throttle curve was incorrect espexially since I had fitted the new engine and had adjusted the throttle linkage length slightly.

.A.

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10-19-2004 10:03 PM  13 years agoPost 7
blockatvalpo

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Reston, VA

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Ah, sorry I misread your post above. It is more than likely the power increase that you are noticing and not your throttle curve. Just make sure there is no binding. If there is just adjust the travel and you'll be set. Try to make it as linear as possible. You don't want it fast at one end and slow at the other.

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10-19-2004 10:23 PM  13 years agoPost 8
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rrNovice

South Wales

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blockatvalpo,

I hope you are right and I just got a little freaked out by the extra power!!

I will check the servo to make sure there is no binding and maybe set the travel adjust to +- 100.

Anyway, I will try again on the weekend if I get time and post back and let you know how I get on.

If I still have trouble I guess I will have to try to find someone local to help me out, but this may be difficult as I have already asked some one and they didn't get back to me in the end even though I was going to pay them

Thanks

.A.

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10-20-2004 03:30 AM  13 years agoPost 9
blockatvalpo

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Reston, VA

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Man I can't believe no one is willing to help you out. Everyone needs help sometime in this hobby. Let me know how it comes. The throttle curve can differ 100 is just a starting point. That is usually the default settings, not 150.

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10-20-2004 04:53 AM  13 years agoPost 10
dkshema

rrMaster

Cedar Rapids, IA

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TRV adjust sets the end-to-end travel of each servo for full end-to-end stick/trim movement.

After setting up the pushrods and servo wheels/arms, I typically use it (especially on thr throttle servo) to insure that my servos don't run up against a mechanical stop (to prevent stalling the servo motor and drawing tons of current and heating up the servo) at the ends of their travel.

Dave

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10-20-2004 04:59 AM  13 years agoPost 11
dkshema

rrMaster

Cedar Rapids, IA

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XP662 Manual ---

http://www.horizonhobby.com/ProdInf...6812-manual.pdf

Page 71 tells you about travel adjustment.

Dave

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10-20-2004 05:19 AM  13 years agoPost 12
SPB

rrElite Veteran

Athens - Greece

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Man I can't believe no one is willing to help you out.
We all trying to help him but from his saying it's obvious that his setup is not correct. Setting up a linear throttle servo movement and then a correct matching pitch and throttle curves can be really confusing for a begginer that's why I didn't try to explain him what to do and I told him to ask some help. There are some thinks that are hard to be explained through a forum. He needs a soft throttle curve as a newby and this is hard to be achieved with a 3 point thottle curve.
I will check the servo to make sure there is no binding and maybe set the travel adjust to +- 100.
IMHO that is not gonna help a lot. Changing only the travel adjust of the servo is half of what you need to do. As I told you you will need to readjust the length of the link as well to match the servo ends but if you insist to try by yourself check out this link it's gonna help you a lot

Throttle setup

Setting throttle curve

Throttle/pitch curves

There is all you need to know to set up correct your heli


Sotiris
myhelis.com Flying Team

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10-20-2004 05:35 PM  13 years agoPost 13
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rrNovice

South Wales

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Hi Guys,

Thanks very much for all your advice and the time you have all taken to help me out

I have taken all your advice and I will be contacting the person I bought my heli from and ask him if he can help me out. Even though he lives about 100 miles away!

Thanks once again.

.A.

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10-20-2004 07:22 PM  13 years agoPost 14
raspeitia

rrApprentice

US - WI

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I actually flew my raptor 30 for the last 2 years on the 662, just upgraded to the 9303.

As someone else pointed out the TRV is the servo travel limits.

I flew mine with 96% as that was as close as I could get with a JR 537 servo.

Do the raptor technique setup to get the link 90 degrees between servo and throttle link.

Start by making the link center line up with the servo screw center and the throttle center (not the link arms but the pivot centers). then go from there to get the 90 degrees on the arms.

The 662 will fly it. I was doing inverted, loops, rolls, but it will not let you adjust the throttle curves to get the most power.

In idle up I ran 52% mid and 100% high. it was always overreving.

That was with 8.5 degrees of pitch. it did not seem to like more than that. Boggs down the engine.

hope that helps.

Ray A.

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10-20-2004 11:55 PM  13 years agoPost 15
alonafuta

rrNovice

Los Angeles, CA

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get the Futaba 9CH

I have one and I’m replacing it A.S.A.P it's good for electric helis only.
For couple hundreds more get the Futaba 9CH

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