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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Correct gear mesh: Spectra-G Main Gear/Pinion.
03-29-2010 05:18 AM  10 years ago
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Justin Stuart (RIP)

rrMaster - Plano, Texas MyPosts All  Forum  Topic

Correct gear mesh: Spectra-G Main Gear/Pinion.
Can you please give me your opinion on what the correct mesh is for a Spectra-G between the main gear and the pinion?

I am installing a Wally 30.5cc motor, and so I managed to obtain a 14T pinion to go with my 92T main gear to get a little bit lower gear ratio than before. I had Raja order me some custom clutch doubler plates to fit the 14T pinion/92T main gear. As you know, the MA Spectra clutch doubler plates do not really allow for much adjustment. I run a piece of regular notebook paper between the main gear and the pinion, and the paper gets an accordion shape to it, but it is by no means super "tight". I have heard that the new way of determining if the gear mesh is tight enough is to use Saran Wrap because notebook paper is too thick. I have grown accustomed to making the gear mesh on my electrics a little bit "loose" because it significantly decreases drag which allows for longer flight times, but maybe that is not a good idea here? The 30.5cc motor I will be using has a lot more torque than the 23cc motor the Spectra was designed for, and Wally thinks a metal main gear might be necessary with the 30.5cc motor.

How tight does the gear mesh need to be with a 30.5cc motor to keep the Delrin main gear from stripping? How loose it too loose? How tight is too tight?

Here is a piece of paper run through the gears:

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03-29-2010 02:58 PM  10 years ago
lejon

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Las Vegas, Nevada

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Justin , I've set mine using the notebook paper and noticed that it was silky smooth on the bench and then after a tank it was still smooth but had loosened up a bit. I would think that using saran wrap and then making sure that it is not binding on any high spots would work fine.

BTW I have the Wally 27 installed with the 14 tooth pinion.

Lejon
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03-29-2010 03:23 PM  10 years ago
rbort

rrProfessor

Franklin, MA - USA

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Gear mesh
I installed the 14 tooth Jewel plates on mine with the spare set that I got from Minair as well and there is a little slop between the main and the pinion but its the same feel as it was when I had the 13 tooth pinion and 92 or 93 main.

I think in general my Spectra always had a little slop between the main the the pinion and has never been an issue. I've never stripped out a main gear yet from this slop -- my first one I ran for 400 flights (93 tooth) until I replaced it with a 92 tooth to lower the GR some back then.

It seems to me that you could "close the gap" some on there, but basically what I'm trying to say is that the way the 14 tooth plates were drilled seems to work just fine for me.

-=>Raja.
MA 1005 Hanson 2703D, 4400 flts
Spectra 27 3DMax, 3460 flts
Whiplash V1-2 Hanson 300, 1995 flts
Whiplash V2 Hanson 300, 923 flts
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03-29-2010 04:03 PM  10 years ago
KopterKat

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New Jersey

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Who do I need to speak with to get this 14t pinion gear? I need one for my big bore engine.
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03-29-2010 04:07 PM  10 years ago
rbort

rrProfessor

Franklin, MA - USA

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Call Minair in Montana
I got the last one from Heliproz North, Jeff at Minair told me some more were in the works though you'll need to call and order for them to get it to you as it may not be a priority if there is no demand.

-=>Raja.
MA 1005 Hanson 2703D, 4400 flts
Spectra 27 3DMax, 3460 flts
Whiplash V1-2 Hanson 300, 1995 flts
Whiplash V2 Hanson 300, 923 flts
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03-29-2010 06:15 PM  10 years ago
CNCjunkie

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Kauai (The Garden Isle), Hawaii - USA

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Feel it
Justin, I only used paper once and found it to be more time consuming than to just set the lash according to feel.

At the tightest point, I set the lash so I can feel it but not really see it unless I look really close and with my reading glasses on. Hold the pinion stationary while rocking the main gear back and forth.

As long as there isn't any binding when you spin up the mainshaft by hand, you're good. The lash will increase slightly as you run the heli.

You can re-check and adjust if needed after a couple of flights.

Question about your gear ratio:

I was going to run the same and after just receiving my 27 upgraded to the 30.5, the instructions say to run as close to 6.4:1 as possible. I'll be working on the G this weekend and will install a 90 tooth main with the 14 tooth pinion I have.

I've been inundated at work lately, so the motor has been sitting for a couple of weeks looking at me.
Just another crappy day in Paradise....Aloha!
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03-29-2010 07:36 PM  10 years ago
Justin Stuart (RIP)

rrMaster

Plano, Texas

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I don't think you can run a generator if you run the 90T gear unless you move the AR bracket.

I'm not worried about the lash being too tight, I'm worried about it being too loose. How do you know if it is too loose?
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03-29-2010 09:00 PM  10 years ago
CNCjunkie

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Kauai (The Garden Isle), Hawaii - USA

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I have the 14 tooth pinion, so I'm thinking the Jewel should be at just about the same position as it was with the 13/92 gearing. I'll be able to report back on that after this weekend when I put the G back together.

If you set up the mesh on the tightest spot with very slight backlash, you should be good. As for how to tell if it's too lose, I would say if you are using the paper method and you have play with the paper in between the main and pinion, it's too lose.

If you're way too lose, you will probably stip the gear.
Just another crappy day in Paradise....Aloha!
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04-01-2010 07:14 PM  10 years ago
kogibankole

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albuquerque/ibadan

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If it were me I would mount it just like any regular motor mesh that you would use with a 3D max or some modified engine. Its not like the main gear is going to strip!...lolif im not blade bogging youll find me pack puffing
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04-01-2010 09:42 PM  10 years ago
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Seriously, nobody has ever stripped a main gear on one of these MA gassers with a modified motor?Avant RC
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04-01-2010 11:07 PM  10 years ago
smallplanes

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S.C. ,SSA

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I would not worry about the paper just push the gears tight leave the bolts on the motor a little lose and tightin it up. The high spot will wear down and you will be good to go. You might hear a little whinning nose but that will go away after the gears mate.
Spectra G 26cc
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04-02-2010 12:17 AM  10 years ago
helicenter

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Winter Haven Fl.

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stripped gears
I have seen stripped gears on MA with stock engines.

Doug
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04-02-2010 12:52 AM  10 years ago
Justin Stuart (RIP)

rrMaster

Plano, Texas

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The only way I have stripped a gear on a helicopter is in a crash, but then again I have never flown a Spectra with an engine which is considerably larger than is recommended.

Does the gear strip in flight if you give too much collective? Does it strip on spoolup if you give it too much gas too quickly? How can this be prevented (short of using a metal main gear)?
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04-02-2010 01:26 AM  10 years ago
helicenter

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Winter Haven Fl.

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gears
In my opinion stripped gears happen when----improper adjustment,
abuse like operating beyond design limits.

I think whats going to happen with these more powerfull engines the gears are going to have to be redesigned, like more surface area, different material.

We are cutting wider gears for the Vario machines to handle almost twice the weight they were designed to handle.

Doug
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04-02-2010 02:25 AM  10 years ago
Justin Stuart (RIP)

rrMaster

Plano, Texas

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There is enough room on the Spectra pinion and on the Spectra frame to almost double the width of the main gear. I wonder if one of the larger Ion-X gears would fit the Spectra?Avant RC
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04-02-2010 02:54 AM  10 years ago
rbort

rrProfessor

Franklin, MA - USA

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No problems with the Spectra main gear here
Never stripped one in flight or even in crashes -- I lost a tooth once from a crash but that's about it. The inner gear for the tail can more likely strip during a crash especially if you hit the tail, but the outside one is pretty bulletproof at least for me.

And I've used a variety of engines from a 231 all the way up to a 29cc.

Don't worry Justin, the gear will not strip on you,

-=>Raja.
MA 1005 Hanson 2703D, 4400 flts
Spectra 27 3DMax, 3460 flts
Whiplash V1-2 Hanson 300, 1995 flts
Whiplash V2 Hanson 300, 923 flts
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04-02-2010 03:42 AM  10 years ago
Justin Stuart (RIP)

rrMaster

Plano, Texas

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What about doing something like a pitch pump or even a tic-toc. Will this break anything?Avant RC
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04-02-2010 05:51 AM  10 years ago
Excalibur

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Destination: Earth

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I don't think you can run a generator if you run the 90T gear unless you move the AR bracket.
Yeah, you can. Remember about a year ago I changed my main gear and had to slot out everything and move my AR bracket? It's a little tricky but can be done. Let me know if you want to do it and I'll talk you through it.

Xcal
Camper Fuel: It's Not Just for Breakfast Anymore
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04-02-2010 11:44 AM  10 years ago
CNCjunkie

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Kauai (The Garden Isle), Hawaii - USA

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With the 14 tooth pinion, I don't think I'll have to go to those lengths, but I should know for sure this weekend.Just another crappy day in Paradise....Aloha!
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04-02-2010 03:00 PM  10 years ago
lejon

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Las Vegas, Nevada

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14 tooth
If you have the 93 tooth main and you install the 14 tooth pinion you have to move the motor, start shaft, clutch assembly (forward towards the nose) to get the right mesh. I have a set of fixed and slotted side plates that I use and they both work well

If the 90 tooth is smaller then it might be a wash when using the 14 tooth pinion.

Good luck

Lejon
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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Correct gear mesh: Spectra-G Main Gear/Pinion.
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