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HomeAircraftHelicopterThunder TigerOther › A few questions about my R30 V1
02-11-2006 04:03 PM  12 years agoPost 1
Dsquared

rrApprentice

North Kent, UK

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Hello all,

I took my R30 V1 out this afternoon after the following:

a) Replacing wood blades with SAB carbons.
b) Adding a Revlock 10.

The following problems occurred:

1) Even with the collective/throttle on full, the helicopter would barely lift of the ground.

Mode 1 of the Revlock is set to give a headspeed of 1700 rpm, Mode 2 set for 1900 rpm.

In Mode 2, the heli did lift, but only just.

Disengaging the Revlock and the heli lifted better but still not brilliantly.

2) With the Revock engaged, the tail seemed to have a slight oscillation which timed itself with an oscillation of the engine speed.


Any comments or ideas as to what's going on here?

My set up is:

Raptor 30 Pro v1
TT 39 pro engine
Revlock 10
Standard servos
Gyro (old but has worked well over the past year)
New SAB carbon blades.
Futaba 7C transmitter


Normal Pitch curve: 9 4 -4
Idle 1: 9 3 -9


Thanks.

David

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02-11-2006 04:50 PM  12 years agoPost 2
BlakeMcBrayer

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Georgetown, Ky

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With the Revock engaged, the tail seemed to have a slight oscillation which timed itself with an oscillation of the engine speed.
I'm not extremely familiar with the Revlock, but I know it is sensitive to engine tuning and will hunt (oscillate) when the tuning isn't spot on. It also has a gain adjustment that if not right will cause it to hunt. As it is hunting, your mains and tails are speed up and slowing down, lead to the oscillation.
Even with the collective/throttle on full, the helicopter would barely lift of the ground.
This sounds like your pitch curves are not correct and your not getting enough blade pitch to generate lift. Here is some more reading on proper set up:

http://www.raptortechnique.com/

.

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

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02-11-2006 05:07 PM  12 years agoPost 3
Dsquared

rrApprentice

North Kent, UK

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Thanks for the reply.

I've just rechecked my pitch and it appears fine. Shows 9 4 -4 as set up.


David

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02-11-2006 10:40 PM  12 years agoPost 4
floppydog

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manchester UK

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whar rpms do you have the revlock set on?

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02-11-2006 11:18 PM  12 years agoPost 5
Dsquared

rrApprentice

North Kent, UK

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Revlock is set to the following:

Mode 1 - 16250rpm (Headspeed should be around 1700rpm)

Mode 2 - 18250rpm (Headspeed should be around 1900rpm)

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02-11-2006 11:19 PM  12 years agoPost 6
Dsquared

rrApprentice

North Kent, UK

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I think it has to be something to do with my Pitch setup. Having said that, the (Robart) pitch guage is showing the pitch which I require.

Odd.

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02-12-2006 12:14 AM  12 years agoPost 7
SkateFreak

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Cambs UK

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have a stab at reducing the pitch anyways and see if this helps..

Does the headspeed sound sound high enough?
It sounds like your headspeed isnt high enough but to be fair... it would definatly be noticable...

How is the tuning on the engine as well?

If you have no luck, report back whilst i ponder some more

-Jvr

Non-3D heli pilots are planker spys trying to bring down the heli community from the inside - Topher

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02-12-2006 02:19 AM  12 years agoPost 8
Loadthis

rrNovice

Riverside, CA

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Do you have the Revlock set up for a non-didgital servo? A non-digi servo will not correct as fast a digi so it could be contsantly hunting for the proper rpm.
If you have the Revlock set for remote adjusting from your transmitter, the ADJUST trim pot becomes the sensitivity adjustment. You may have it set too sensitive for the standard servo to keep up with.
Double check your math when figuring the gear ratio. The common R30 Ratio is 8.5:1 so if you do have your governor set to 16250,
16250/8.5 = 1911.7647... your headspeed would be 1912 rpm, wich would be plenty to get it up. It sounds like your rotor speed may be too low for the pitch settings.
The revlock requires that your ATV be somewhere betwenn 0- 85/115%,
If you are over this the revlock may not be pushing the servo to its programmed full travel.

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02-12-2006 09:15 AM  12 years agoPost 9
Dsquared

rrApprentice

North Kent, UK

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Hello again,

SkateFreak, the headspeed does "sound" high enough. I 'think' the engine tuning is fine - it was flying well before I made the adjustments (pitch curves, blades and Revlock).

Loadthis, yes, Revlock is set for a non-digital servo. The ratio for the R30 v1 is 9.56 as stated on the back of the manual. This would give a mode 1 headspeed of 1699.8rpm.

My 'gut feeling' is that Revlock may not be the problem. I don't think it's currently perfectly set up but the headspeed (as you said) should be high enough to lift the heli.

Excluding the Revlock from the argument (for a moment), the problem would seem to be focussed around the Pitch setup. But this confuses me as the pitch guage reports a good pitch setup.

I think I need to sit down and FULLY review the entire setup from the start!

Thanks for your comments so far. I'll have a look at the heli during this week - weather isn't looking too good so it may be a while before I get out to the field again. (It's times like these that I wish I lived in the US where the weather is better for this hobby!!!)

Thanks again.

David

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02-12-2006 12:47 PM  12 years agoPost 10
SkateFreak

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Cambs UK

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It could possibly be a problem with you pitch servo...

If the headspeed is up then you would definatly lift off, if no then i'd say play arouns with the pitch curves....

If you say the headspeed already sounds good then increase the pitch a little... also try replacing a servo on the collective jst to see...

-Jvr

Non-3D heli pilots are planker spys trying to bring down the heli community from the inside - Topher

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02-13-2006 08:35 AM  12 years agoPost 11
Dsquared

rrApprentice

North Kent, UK

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Right, here's the strange thing: I rechecked my pitch curves and they were out!!!

This is odd as I did a complete check of the system before going out on Saturday. But, as I said, last night when checking the curves again, they were now NOT what I was expecting.


I'll have to wait now for better weather before I can check if this was the cause of the problem.

I'll take my pitch guage to the field in future in case this happens again.

Really strange.


Thanks all, I'll report back soon.


David

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02-13-2006 11:57 AM  12 years agoPost 12
PaulJC

rrElite Veteran

Hertfordshire UK

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Could it be that your pitch curves are not set correctly for all flight modes?

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02-13-2006 12:16 PM  12 years agoPost 13
SRH990

rrKey Veteran

Birmingham, UK

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I'd also go with checking curves for all flight modes. I've two Revlocks in use, one on a Raptor 50 with OS50 Hyper, I had problems with slight tail kicking caused by fluctuating engine rpm - tracked down to a too rich needle setting. The Revlock can cause some issues if the engine isn't set up right but it shouls still get off the ground! Can you double check head speed with a tachometer? If so then you isolate this as a cause. Other than these teething niggles the Revlock is brilliant once setup as per the manual.

Steve -Trex 700N, Trex 600N, Raptor 550E, 450SE, Mini Titan, Logo 5003D, Beam E4

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02-18-2006 03:54 PM  12 years agoPost 14
Dsquared

rrApprentice

North Kent, UK

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Took the R30 out today and she flew very well.

I'd re-checked the pitch curves and made some adjustments. For some unknown reason, the curves were out last time I was at the field (strange as I had checked them before leaving).

This time all seemed okay.

I get a twitchy tale when I select 1700 rpm but not when I select 1900rpm. For the majority of the flights today I flew it at 1900rpm and kept it there.

Thanks for the replies guys.


David

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02-18-2006 08:33 PM  12 years agoPost 15
Dr.Don

rrVeteran

Cedar Park, TX -- USA

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Suspect the problem was in the change of blades. Particularly going from woodies to carbons you often find that the blade pitch with respect to the root is not the same. So you need to recheck the actual blade pitch with a pitch gage for the curves you are using.

2atlo8

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