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HelicopterRadio - Servo - Gyro - Gov - Batt › Verdict on the JR 370 3D gyro
09-06-2009 06:07 AM  8 years agoPost 1
born2rc

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Rolla, Missouri

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Hello

I was wondering if some of you have already tested out the JR 370 3d gyro. I would like to see comparison between the 370, with the JR 770, or Futaba gyro or other name brand gyros.

Will really appreciate your feedback ... Bob

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09-06-2009 02:47 PM  8 years agoPost 2
fast400

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shelby twp. michigan

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well bob sense you`re from my home town, i`ll tell you this.
i have the 370, and have had the gy401.
the 370 is 100% better over the gy401.
i went from the stock g110 gyro to the gy48v from helidirect.com, to the futaba gy401, now the g370 3d/ds3500g combo.that i got from http://www.amainhobbies.com with a FREE t-shirt.
its like going from a soapbox derby car, to a yugo, then to a VW bug, then straight to a shelby super snake mustang.

i believe the futaba gy520 has the(MEMS)technology as the JR g370 and the JR g770.
seen the gy520 on a 50 nitro last weekend, it seem`s to hold very well

just my opinion, but i`ll never get another gy401. if i ever try futaba again, it would be the gy520.

the only downside i see to the JR g370 is, its design is digital only and is made for maybe 3 servo`s. where as the gy520 can run alot of different tail servo`s.

would i have gotton the gy520 over the g370, NOWAY. but i would be willing to try the gy520 along side the g370 to see if i can feel a difference.

crash`s come easy patience`s doesnt

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09-06-2009 09:39 PM  8 years agoPost 3
scottc

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shakopee minnesota..USA

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I think when the new 370 gyro says it uses only digital sevos it means most any digital servo. but servo like the 9256, 9151 or the futaba 251bl would not work cause of the pulse band width

Hey I didn't ask for this fetish.!!!But I'am sure paying for it....

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09-07-2009 03:25 PM  8 years agoPost 4
DWS6

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Newark,DE

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Scottc is correct. It can run any servo except the 760 nanosec pulse width 9256, 9251, and bls251.

The 370 is supposed to be the same as the 770 with a slightly softer stop and lighter weight. If it does indeed fly the same as a 770 then there is not even a comparison to a 401, 611, or 502. Spartan is also a very good option and flys great with more tunability over the JR gyros.

Dave Williams
Team Align

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09-08-2009 01:13 AM  8 years agoPost 5
Thumpernator

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Senoia, Georgia, USA

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Which servo would work better with the G370, the JR 3500G or the Futaba S9254?

I believe the Futaba is faster, but not sure of the torque.

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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09-08-2009 02:09 AM  8 years agoPost 6
DWS6

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Newark,DE

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For what size heli? 3500g would be a great choice for a 450-500 size. Any bigger would be a 9254 or even better 8900G.

Dave Williams
Team Align

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09-08-2009 03:55 AM  8 years agoPost 7
Thumpernator

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Senoia, Georgia, USA

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For what size heli?
Raptor 50 Titan

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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09-08-2009 12:45 PM  8 years agoPost 8
DWS6rrKey Veteran - Newark,DE - My Posts: All  Forum  Topic

The 3500g is a mini servo and would be to small for a 50 size bird as you get better. You need a full size rudder servo. A 9254, 9253 (if you can find one), or a 8900g. You can't go wrong with any of these. You could also use an Align 620 or the new 650 which should be ouT soon.

Dave Williams
Team Align

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09-09-2009 04:34 AM  8 years agoPost 9
Thumpernator

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Senoia, Georgia, USA

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Thanks, Dave. BTW,,,,great name

Ok, I bought the G370 to use in my Raptor 50 Titan using a JR X9303. I've got the radio set up per the instructions and plan to fly in the morning. The instructions say to set the D/R to 100% and that it is used to set the piro rate. I'm assuming that the 100% setting is for the quickest piro rate.

But since my skill level is just approaching flying my first circuit, I don't want the fastest piro rate. What setting would you guys recommend? BTW, I've set the Expo to 50% and the Gain to 73% as per the instructions for a Trex 500 belt, since this is the closest example given in the instructions to the Raptor.

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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09-09-2009 12:59 PM  8 years agoPost 10
DWS6

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Newark,DE

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Thanks Dave!

If the setup is the same as a 770 which I bet it is then make sure the ATV is at 150 on the rudder. Then bring your D/R down to about 50-55. That should give you a nice managable piro rate. Expo at 50 should give about a 10% Expo feel so that's good.

Dave Williams
Team Align

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09-09-2009 03:44 PM  8 years agoPost 11
wtupman

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marrero,la-usa

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the atv settings are diffrent on the v370. set them at 110. also make sure that the arm lendth is at 14mm. all else sounds good. the 370 is somewhat diffrent than the 770 on setup follow the instructions and wou should have no problems

DONT TRASH WHAT THE OTHER GUY IS FLYING OR FLYING WITH. AT LEAST HE IS FLYING!!!

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09-09-2009 03:48 PM  8 years agoPost 12
DS 8717

rrProfessor

Here wishing i was somewhere else

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Lowering the dual rate and atv does the same exact thing.just leave the dual rates alone and turn down the ATV untill it has the speed you want,i would guess 70 or 80% would be where you would end up.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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09-09-2009 04:19 PM  8 years agoPost 13
DWS6

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Newark,DE

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Dave,

You will get 100 different ways on gyro setup 90 of them will be wrong. Follow the instructions that came with the gyro. If it says ATV's at 110 then set it there and use the D/R as suggested. I have setup 30 or so 770's and have followed the book as a reference. Everyone of them hold like a rock in every aspect of flight.

I can't speak for the 370 but the suggested arm lengths for the 770 were not correct and needed to be tweaked a bit to get perfect performance. Start with what they say and let me know if you have any weird tendencies and I will direct you from there.

Dave Williams
Team Align

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09-09-2009 04:34 PM  8 years agoPost 14
DS 8717

rrProfessor

Here wishing i was somewhere else

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The ONLY reason you would NEED to use DR is if you want different piro rates in different flight modes.ATV and dual rates do the same exact thing. Since your just learning you dont need dual rate on your TR.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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09-09-2009 07:30 PM  8 years agoPost 15
Thumpernator

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Senoia, Georgia, USA

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Test flew it this morning, with the setup like the instructions. The tail oscillated and also wanted to drift to the left. I tried lowering the gain, increasing the gain, changing the D/R, and the Travel Adj and could not get rid of the oscillations.

This was with the original S9254 servo that came with the 401 gyro. I'm now thinking that the servo may have a dead band around the center position. The only other servo I have is the new 3500G that came with the G370. If I want to try it out, I'll have to either buy a micro to 'normal' size adapter or make one. Or, should I just buy a different servo?

With the original 401, I didn't have the tail oscillations, just the slow drift to the left. Tell me if my thinking is off track. I'm thinking that since the G370 is a more sensitive gyro, and assuming the servo has a dead zone, it's trying to correct more and thus the oscillations. Lowering the Gain, as per the instrucions, did not get rid of it, nor did it seem to change it much. I tried increments of 5% all the from 55 to 95.

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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09-09-2009 07:55 PM  8 years agoPost 16
JEEPWORLD2002

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BLUEBELL PA USA

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i am thinking you need to follow the direction for the 600n rather then the trex500. and just to check you moved the dip switch to nitro ? now i would recomend using the 8900g on the tail for a 50 size the 3500 is great servo but dont think it will cutt it when it come to the power n tr size. the 9254 will work with the 370 first what horn are u using on the tr servo ? what is the distance from cntr to ball on the horn ? i think the it calls for 10-12mm did you set the tail for no drift in rate mode ? so go into ur gyro sense set the gain for 48% and take off but be quick on the stick as rate will move around set the linkage to cancel the drift then switch into hh set the gain 65% (jrtx so hh 15-25% ) ok no try to hover, does it wag ? yes lower the gain/ No do a pitch pump sis tail move ? yes add gain. some will say adj gain till it wag then back off. can be done either way.

Trex600n Trex500 Mikado LoGo5003d// Hacker, CastleCreations,Ys 50, JR 7703d/8900, Radix

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09-09-2009 08:16 PM  8 years agoPost 17
DWS6

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Newark,DE

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Yes, excellent advice Jeepworld!

Sounds like you need to reduce mechanical gain (ball needs to go in on the servo horn, or closer to center). This should allow you to run a higher electronic gain with out the wag. If your to far out the gyro sort of chases itself.

It is critical to trim the tail mechanically in rate mode.

Dave Williams
Team Align

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09-09-2009 10:17 PM  8 years agoPost 18
fast400

rrApprentice

shelby twp. michigan

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ok guy`s try this.
i have the 370/3500 as well, in normal mode of flight it work`s great.
i hit idleup, my tail wag`s so bad the case turned.

i have lowered my gain but am affraid to try idleup again, if the case turn`s again this time i may not be so lucky and save it.
in rate im running 25%, anything higher and the tail act`s like HH. in HH im at 62%, but again i was at 65% when the above described happened.

this is on a blade400 with the align 35g and the stock 420 motor with a 11t pinion.
i have no drift in rate or hold, it`s just when i hit idleup the tail wag`s badly. like i said it actually spun the tailcase.

crash`s come easy patience`s doesnt

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09-10-2009 12:27 AM  8 years agoPost 19
Thumpernator

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Senoia, Georgia, USA

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I have adjusted the mechanical center. Flew in Rate, trimmed, then adjusted rod to take out the trim. But it still wags. I was at 11mm Arm Length. Increased Arm Length to 14mm and it seemed to tame it down some, but the wag is still there. I've tried using gains of 55 all the way up to 90, using various Travel Adj. settings. Just can't get rid of the wag in either Rate or HH.

Rechecked the linkage and it is free with no binding. Head speed is Governed to 1800 and confirmed with a rotor tach. Very frustrating, as it's not flyable the way it is now. With the 401, I got no wag, it just drifted very slowly to the left.

I may just pack up my stuff and go down to Mac Hodges Hobby shop and see if they can help figure it out. At least if I need a part, they have about everything on the shelf.

I'm running out of hair.

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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09-10-2009 01:27 AM  8 years agoPost 20
DWS6

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Newark,DE

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Dave,

I find it odd that going out On the horn helped as this would increase mechanical gain causing the electronic gain on your menu to overdrive and wag like crazy.

For an experiment turn your gain down excessively low just to see of it stops. Something like 55 down to 30. It is wierd that it does it in rate also unless it's not truely in rate. Do the tail blades always snap to center (5 degrees tail pitch) or does it stick to one side as this would indicate HH. Also what menu are you using for your gain? Gyro sense menu channel 7 would yield much higher numbers (60-70) then channel 5 gear. With the gear ATV your values will be around 30-35 as negative numbers are rate positive are HH. In gyro sense menu above 50 is HH and below is rate.

Dave Williams
Team Align

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HelicopterRadio - Servo - Gyro - Gov - Batt › Verdict on the JR 370 3D gyro
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