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HelicopterThunder TigerOther › How to XeroG Frames
05-06-2005 06:39 PM  12 years agoPost 21
Yug

rrMaster

UK. Herts

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Tris,
the 8700G is quite a noisy servo and it caused lots of glitching problems when I was PPM. The 1000uF cap helped alot. I'm now PCM (R149DP) but left it on anyway. The noise (RF and PSU) generated when using all digital servos is really quite extreme, and gives receivers a real headache. However the ZeroG is carbon fibre which is a good conductor, so, I have the frame grounded to the battery (-), and by running all cabling within the frames, tends to screen much of the RF noise. I use a 24" carbon antenna (on all my helis) which gives me a range of about 400 feet with Tx aerial fully collapsed !. My ZeroG gives best performance here cos of its superior screening. My other helis run to about 300 feet. I haven't checked the max range with Tx aerial fully up - the heli would definately be completly out of visual range.

Vegetable rights and Peace

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05-07-2005 10:21 AM  12 years agoPost 22
Sprokkel

rrNovice

Arnhem netherlands

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Thanks guys i will order them.

kind regards,

Dennis

Remember racing was dangerous, and sex was safe

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05-07-2005 10:32 AM  12 years agoPost 23
DOKEY

rrProfessor

Northamptonshire UK

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Hi Guy Martin,

Have you sorted the drift problem after doing flips yet ??

I was loking at your pictures and woundered, that with that capacitor on the wires of the gyro, if it is maybe adding a little leverage (frequency vibe) to the gyro so when a slight shake comes on(sometimes a heli can when doing flips) it is messing the gyro sensor readings up?

That probably does not make sense but hard for me to explain

Just a thought that maybe is worth tring ?

Ryan.

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05-07-2005 10:59 AM  12 years agoPost 24
Yug

rrMaster

UK. Herts

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Dokey
I'm still rebuilding the machine after my Crystal failed last week. Tailstand. 50 feet up when crystal failed, loads a damage. Have just about finished rebuild apart from replacing the 8700G gears - they got mashed too. I have however ounted the gyro rather differently. I took some advice from RussD and cut a 30mm x 30mm x 1mm brass. The gyro mounts to this via a pad, and the brass sheet mounts to the frame via a pad cut into 4, so we have 4 mounting feet approx 10 x 10mm each which will be 'softer' than a single piece. The brass increases the overall mass so the damping will be greater. I might have to decrease the gain a tad, we'll see. I'm also thinking of a similar mount for the receiver so as to minimise vibration to the crystal. I'm just in the middle of implementing longer set screws on the tail grips to prevent possible fracture at the base of the hex hole. I'll post pics of the finished machine when all is done.

Vegetable rights and Peace

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05-07-2005 11:02 AM  12 years agoPost 25
DOKEY

rrProfessor

Northamptonshire UK

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replacing the 8700G gears - they got mashed too
Ouch !!! must have been a bad one then

Ryan.

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05-07-2005 10:51 PM  12 years agoPost 26
cyclic

rrNovice

Berkshire UK

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I could not solve the interaction using 8231 servos on my Xero-G raptor...(yes correct servo horns)
A switch to 9252's made all the difference...
What was the specific reasons that made the 9252's the better option.

I'm looking at doing the conversion and currently considering JR DS8417 as they are quick 0.10 sec and 6.5Kg.
Any considrations or thoughts on this choice?

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05-07-2005 11:09 PM  12 years agoPost 27
DOKEY

rrProfessor

Northamptonshire UK

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Are 8417's metal geared ? (I'm not sure tbh) but if they are, be warned of the slop build up that can be gained from the metal gears after a while.

Ryan.

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05-08-2005 12:11 AM  12 years agoPost 28
tris_heli

rrKey Veteran

Lidlington, Bedfordshire, UK

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Personaly i wouldn't us 8417's on a heli any more.

There's been alot posted about them failing, granted these were when they were being used on the tail but see http://www.runryder.com/helicopter/t76008p2/ and the post from mac_man.....

9252's would be ideal but if you want to stick with JR then DS8321 would be a good one to go for...

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05-08-2005 12:58 AM  12 years agoPost 29
Yug

rrMaster

UK. Herts

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I switched to 9252s and am very pleased with the results. They seem to track much better and centre very accurately. I also feel that they are more consistent, ie all 3 servos operate very similarly which is essential for eCCPM. Although I haven't yet measured them, I feel they may also generate slightly less noise on the power supply than the equivalent JR servos.
Anybody got any recommendations for a servo to replace an 8700G with an SL560 ? My gears are shagged after crash, so I have the option of replacing the gear set (everybody is out of stock) OR replacing the whole servo.

Vegetable rights and Peace

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05-13-2005 10:01 PM  12 years agoPost 30
Ricky.m

rrApprentice

u.k

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hi I use the 8417 jr servos in my xero g and it's friggin awesome!!
the collective is virtualy real time, it's so fast you can alomost never catch it out of time with your stick inputs for pitch and cyclic, this made my 50 mega nimble epecialy with the miniture aircraft paddles,
the slop is there in the servo's but it seems not to worry it,no noticable control problems even in fff, also managed to crash it real hard and break every frame plus most everthing else but all the 8417's survived un dammaged!! (just my thougts)

Align Trex 600N Magnum Fuel DX 'The Future' 7

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05-13-2005 10:37 PM  12 years agoPost 31
Yug

rrMaster

UK. Herts

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Hobbit Basher:
I've just completed the rebuild and hope to give it a wizz tomorrow. I'm interested to know what sort of head you have and its pitch and cyclic throws. Which servos do you use for the 3 collective servos ?
I've done quite a few mods during the rebuild, using the stronger rocket links, particularly for the front swash linkage. Filed the rocket down so it would fit into the tube, and used an M2 bolt all the way up into the link to give it more rigidity. I've also found that the rocket gives the perfect length to lift the front of the swash to exactly the right position giving me +/- 10deg pitch on a quickUK head and 8 deg cyclic with no binding. I did have to file the aluminium flybar control hoops to prevent binding on the washout at full pitch/cyclic. The 22mm horns are great - virtually zero interaction.
I'll also get to find out (at last) how well the SL560 behaves on its new mountings as recommended by RussD.
Have done the tail mod using 21mm set screws - will not shear now !!!

Vegetable rights and Peace

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05-13-2005 10:39 PM  12 years agoPost 32
Rappy da Raptor

rrVeteran

Dorset

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In his previous post he said he is using 8417 jr servos.

Plus im pretty shaw he is using the Quick Uk head

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05-13-2005 11:16 PM  12 years agoPost 33
Yug

rrMaster

UK. Herts

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Yes you're probably right. I was thinking these were tail servos, but didn't realise they were 6.5Kg/0.1s. No wonder response is quick !
Do you know how these servos stand upto 9252's interms of reliability ?

Vegetable rights and Peace

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05-14-2005 09:33 PM  12 years agoPost 34
Ricky.m

rrApprentice

u.k

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hi guy,
not sure about the comparison but the 8417's have been very durable in mine so far and I think the price has come down slightly too!!
glad to hear youve got rid of the interaction issue,, i'm using the quick uk head with standard TT swash , j.r super servo arms (think 25 mm)
+ - 11.5 deg collective and 8.5 deg cyclic (+ 12.25 deg throttle hold)
this seems to be the max set up and as you say the paddle control hoops need a look see!! i've only got the plastic one's on at the mo.

Align Trex 600N Magnum Fuel DX 'The Future' 7

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05-14-2005 09:41 PM  12 years agoPost 35
DOKEY

rrProfessor

Northamptonshire UK

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8.5 deg cyclic
Does the heli turn on penny by any chance

Ryan.

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05-14-2005 09:47 PM  12 years agoPost 36
Ricky.m

rrApprentice

u.k

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The heli probably get's around as good as any other especialy with the fury paddles fitted!
must been seen!!( hopefully getting a vid sorted for the real raptors web site)

Align Trex 600N Magnum Fuel DX 'The Future' 7

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05-14-2005 09:56 PM  12 years agoPost 37
Yug

rrMaster

UK. Herts

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hobbit basher:
I found the bottom of the plastic hoops snags with the washout arms if you are on the outer hole. I modify the metal hoops, first by coning out the top hole a bit so that you can screw the plastic link in much further without loosing material. The bottom right of the hoop is filed away in 2 places to prevent snagging 1) the washout-link-pin-grip-bit and 2) the washout arm itself. I don't use a delrin disc so I just have to be sure not to pull the stick into the corner.
The 8417s do seem good value. Shame cos I've just spent my money on upgrading to 9252s. I find the futaba servos generally to be more repeatable in positioning and response than the JRs.
I am impressed with your cyclic throw and pitch range.
Do you reckon the fury paddles are better than the carbon Vs which are only 15g ?

Vegetable rights and Peace

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05-14-2005 10:03 PM  12 years agoPost 38
Ricky.m

rrApprentice

u.k

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yep with out doubt the fury one's for the smaller fly bars are still 90 heli sized padles so all you need do is cut between 10 - 13 mm from the ends following the same shape and then blunt the leading edge to eliminate pitchiyness in FFF and bob's your uncle!! much better response!

Align Trex 600N Magnum Fuel DX 'The Future' 7

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HelicopterThunder TigerOther › How to XeroG Frames
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