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HomeAircraftHelicopterThunder TigerOther › Raptor 70 headspeed issues
11-02-2004 10:16 PM  13 years agoPost 1
SPB

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Athens - Greece

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Hi all.

This is the second time I am asking some opinions on this matter.
No matter what I've done the headspeed on my R70 cannot go further than 1750rpm. Current setup is 680 symetrical CF SAB blades with +9 degrees max pitch, stock paddles, TT70 with standard TT muffler, GV1.

I have set to GV1 max rpm 1800 in idle up 1 and 2 but the max rpm I am getting from the GV1 are 1750. Mixture settings are right on spot I tryed leaning the high end but....nada.

A friend told me that a possible cause might be the clutch not engaging very well and that maybe I should replace the liner with a thicker one.

The reason I am asking for some more rpm are primarily a faster response in 3D manouvers so I was also thinking the replacement of the paddles. From your experience which are better for a R70. MA white paddles or the V-paddles? I have the MA paddles in my 50 and I am very happy but I have also heard good comments for the V-paddles.

What do you suggest?


Sotiris
myhelis.com Flying Team

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11-03-2004 12:17 AM  13 years agoPost 2
BlakeMcBrayer

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Georgetown, Ky

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Make sure your gear ratio is set right in the GV-1. i think the stock ratio is 9.3 to 1.

Have you tached it with the GV-1 off? Try turning it off and raising your headspeed with the throttle curve.

The other thing that comes to mind is the standard muffler. A poor designed muffler or one with something in it causing restrictions will KILL you upper end power and hold headspeed down.

Don't come off the throttle untill you see your GOD!

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11-03-2004 12:18 AM  13 years agoPost 3
TerryG

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So. Daytona, FL

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Do you have the gear ratio in the GV-1 correct (standard @ 9.3:1)?

Also, try setting the GV-1 max RPM to 1850 and measure to see what happens.

When I had the TT.70 in mine, it ran all day at 1850 without trouble.

As for the paddles, I've used both the white MA and the V paddles; I'm far happier with the 90mm V paddles.


Terry

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11-03-2004 12:31 AM  13 years agoPost 4
daren

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Hampshire Sponsored by Quick UK

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Here we go then, if your clutch was slipping then the gov wouldn't know that as the sensor is on the fan.

You said that the mixture is spot on explain to me how you know this.

As BlakeMcBrayer said it could be your exhaust but unless you have a really crap one then i don't think it would be a problem, as said before check the gear ratio on the gov.

Also check when you calibrate the idle,high and kill that it checks out ok, make sure your servo is moving the throttle arm all the way to high by popping the ball link off with the stick at full and seeing if you can move the carb barrel any further.

as for paddles i used the white 20g miniature aircraft paddles for over a year and thought the were siht hot until i tried the 95mm v paddles, i wouldn't say it rolls alot quicker but it does tictoc alot better.

If the above doesn't work then let us know and i'll think about it.

Daren
Using the ground to reverse engineer

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11-03-2004 06:45 AM  13 years agoPost 5
SPB

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Athens - Greece

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Hi guys.

Well the gear ratio is correct set on the GV1. I was also thinking does anybody tried a lower gear ratio with the TT70? What if I will use the 11T pinion and lower the gear ratio to 8,64:1? Then at 16.000 rpm I can easily get 1850 headspeed.

The TT muffler is not that bad I think at least not that bad to restrict so much my high end. Maybe I am wrong.

The mechanical set up and the limits in GV1 are correctly set and the engine performs really well in climb outs. I am monitoring the temps with an on board temp monitor and with 3 turns out both the temps are always 197-200F even after hard use. The smoke trail is good, the transition very smooth and idles within 1/2 sec after landing. I also tryed leaning the engine so much that I got 240F which are way to much for a 70 but with no results in the headspeed.

I'll try the V-paddles but I see daren tried the 95mm and Terry the 90mm what are the pros and cons for the shorter and longer and vice versa?

Thanks


Sotiris
myhelis.com Flying Team

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11-03-2004 10:34 AM  13 years agoPost 6
daren

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Hampshire Sponsored by Quick UK

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if you try a different gear ratio i think the tt70 will struggle as its not the powerfullist motor about, I can't see where you're going wrong when i had a tt70 on the 9.3 ratio i had no problems getting 1900,

Just re-read your original post, the tt muffler although sounding a little raspy will do just fine, lets try this from a different approach;

Take the exhaust off and look at the piston, tell me what it looks like if its nice and shiney (spelling) take the heli for a flight but this time lean the idle needle in and richen the top slightly,keep flying it around flat out land and check the temp, i kept mine around the 220 mark,I know from experience that the tt70 has a funny needle setup.

If that doesn't work push the gov limit up to 2000 fly it and see what the max rpm is, don't worry about over reving the motor it will do it.

As for v paddles, I've tried 80mm and now 95mm only tried 95 to see if there was a difference, I think the 80's are like the mini air white paddles but the 95's are more responsive around the middle.

Daren
Using the ground to reverse engineer

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11-03-2004 10:41 AM  13 years agoPost 7
SPB

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Athens - Greece

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Thanks daren. I will try it.

The motor is new (yesterday finished the 3rd gallon). It was running in for the previous two gallons with very reach low end and the piston is shiney. I closed the low end by one turn last week so I will try leaning it further and will keep you posted.

I am afraid thought that shuch think will not be possible for today or tommorow cause weather is a little messy since yesterday.


Sotiris
myhelis.com Flying Team

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11-04-2004 07:11 AM  13 years agoPost 8
Tek

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Yukon, OK USA

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What kind of gas are you running? And for the paddles I am a fan of the white MA ones.

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11-04-2004 09:05 AM  13 years agoPost 9
SPB

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Athens - Greece

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Hi,

I am using CP15%. I am using the MA white ones in my 50 and are fine. Nice rolls and flips but as everybody says a little unstable in FF nothing that cannot be compensated with some expo. They are also pretty cheap and that's a big plus.


Sotiris
myhelis.com Flying Team

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11-04-2004 01:53 PM  13 years agoPost 10
Tek

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Yukon, OK USA

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Try using 30% gas since it will give the engine a boost in power. Also TT engines like the low end rich and then lean the top end for the best power.

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11-04-2004 02:28 PM  13 years agoPost 11
Joe Ubaldo

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Grand Rapids, MI USA

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Keep in mind SPB, if you're determining the maximum rotor speed by checking the max speed recorded by the GV-1 once you land, you're probably not getting the correct speed. You see, the max speed listed by the GV-1 only gets logged at full throttle. If at full throttle, your engine is bogging (because the engine is too rich or you've over pitched it), the rotor speed recorded will be lower than the actual max speed (which would occur during a fast decent or while hovering).

Use a sky tach to find the true speed.

Hope that helps.

Good luck.

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11-04-2004 06:50 PM  13 years agoPost 12
SPB

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Athens - Greece

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Thanks Joe I will try that also. I just hope the weather to get better at weekend. There lots of wind the last couple of days.

I am just about to order a set of paddles and I am still between V paddles and the white MA. From your experience since the V paddles are CF are damaged in a potential crash?


Sotiris
myhelis.com Flying Team

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11-04-2004 07:40 PM  13 years agoPost 13
daren

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Hampshire Sponsored by Quick UK

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The white ma paddles do survive a crash better, i've had 4 with the v paddles so far and everytime i walk over to the remains i say a little prayer for them. been good so far

Daren
Using the ground to reverse engineer

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11-04-2004 09:20 PM  13 years agoPost 14
SPB

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Athens - Greece

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Daren thanks for all your replies in this post.
You are really helpfull.

Thanks


Sotiris
myhelis.com Flying Team

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