Goblin helicopters technical support thread

[scoti333]

Originally Posted by SynergyAero

So I received an email today from SAB, explaining the delay in shipment of Goblin 700's. It contained the following excerpt:

"To offer the best performance that can be attained, we have chosen a new gear technology that will allow the SAB Goblin to harness the most brutal brushless power systems available, allowing you to push the Goblin harder & faster than ever thought possible."

Can you (goblinhelicopter) explain what exactly the difference is, and how it affects performance?

Curious what has changed, and if it may impact what equipment I have chosen and purchased for my 700.

Grazie!
Cris

Id like to know this too... Also, is this why the release of the manual was delayed as well??

[Thunder Fighter]

A question on the main blade grips and thrust races.

When I look at the exploded view of the head it shows the thrust raced placed on the outside of the bearing of the blade grip. But when I look at the cut away view on the next page it appears that the thrust bearing is on the inside, i.e. between the two bearings.

Which is the correct setup?

//Dennis.

[ola.c]

I'd say between the bearings.

[Thunder Fighter]

Originally Posted by ola.c

I'd say between the bearings.

Hej Ola, I would agree, but at least they know one of the views needs to be updated now.

//Dennis.

[goblinhelicopter]

The new gear has new materials and new building systems.
The concept does not change.
The thrust bearing is at the center of the two bearings.
Sorry, I will immediately correct the exploded view of the head.

[worldofmaya]

Is it possible to set mesh between gears in second stage?
That was one of the main issues with powercrocos in the second stage of my TDR.
-Klaus

[Sao]

Originally Posted by goblinhelicopter

The new gear has new materials and new building systems.
The concept does not change.
The thrust bearing is at the center of the two bearings.
Sorry, I will immediately correct the exploded view of the head.

So are you moving away from the metal main gear?
I hope not that was a real nice feature and something not seen before in RC helis, usually we have to put up with warped plastics that never run true.

[McCollister911]

Please no warped plastic gears, that's all align can make! That would be a disappointment on a heli with this much hype surrounding it! Considering all the beautiful pictures, the unique drivetrain!
Those videos of tareq and Bert had the gear I want

[goblinhelicopter]

Originally Posted by worldofmaya

Is it possible to set mesh between gears in second stage?
That was one of the main issues with powercrocos in the second stage of my TDR.
-Klaus

You can not adjust the distance in the second stage.
On the Goblin use gears with very low tolerance. You do not need adjustment.

[geekindenial]

So could goblinhelicopter please confirm what is the final material used for the main gear if not metal?

[bobloblaw]

Trying to find where a metal main gear is mentioned for the Goblin. All the current pics look like a metal hub with a black plastic main gear.

[scoti333]

The pinion that drives the main gear is metal.

[Vom Feinsten]

The litle gear will always be in metal-the goblin one looks to be alloy which make sence if the maingear is steel....

On this picture I dont think the maingear is an alloy hub and a plastik maingear.....

[worldofmaya]

Originally Posted by goblinhelicopter

You can not adjust the distance in the second stage.
On the Goblin use gears with very low tolerance. You do not need adjustment.

Even a M3 hole (for frame screws) is enough to allow a little bit of movement / distance changes which can cause serious problems when using high-power motors.
-Klaus.

[Scottyb410]

The main gear looks like delrin..

[desertstalker]

Originally Posted by worldofmaya

Even a M3 hole (for frame screws) is enough to allow a little bit of movement / distance changes which can cause serious problems when using high-power motors.
-Klaus.

Except that the two gears are both mounted to the same metal plates (looking at the exploded views), so there should be no misalignment issues due to screw holes. Tolerances for high-end CNC are easily capable of setting accurate gear mesh.

[Sao]

Here's a pic a friend took at the flyin where Bert crashed, friend said it was a metal main gear. He will get some more shots and investigate more at the orlando flyin.

[bobloblaw]

If that main gear is metal I will eat my hat.
However, it is obvious that both the pinion and first stage gear is metal.

[desertstalker]

Originally Posted by bobloblaw

If that main gear is metal I will eat my hat.
However, it is obvious that both the pinion and first stage gear is metal.

Certainly looks plastic, besides I wouldn't want a metal gear, the wear issues would be significant. You need lubrication on metal-metal gears, which is difficult on exposed gears, most metal geartrains use a semi submerged sealed system to provide adequate lubrication.

A high quality (which i am sure it is) gear will provide a much longer lifespan than a metal gear, which will wear and develop slop quite rapidly (look at all MG servos, they are in a case with grease and still generally develop slop faster than those with plastic (or composite) gears in them).

[Thunder Fighter]

I would prefer a metal (alloy or Steel) interfacing to a composite gear as with some of the new plastic/composites you can have them self lubricating and get a very low wear, low friction interface while still maintaining a high strength.

The one from the earlier picture looks like it has been machined, if that is what they do for the production you should find there won't be any warped or out of round gears as they should be as accurate as a metal machined gear.

//Dennis.