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HomeScale✈️AircraftScale HeliRoban Scale Helicopters › ROBAN 412 800size BUILD THREAD
06-06-2020 05:28 PM  10 months ago
Girard Ibanez

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Tucson, Arizona (formally from Guam)

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Spookyeng
droneproz
Girard Ibanez @droneproz,

I'm building a Roban AS350 and Huey. I'm having issues with a Scorpion 560kv in particular the motor mounting holes and bearing support.

Can you share some light on this subject? Perhaps a picture of the motor section.

Thanks.
Yes the scorpion holes DO NOT LINE UP, its crazy bc its what's recommended. Thats why I went with EGO DRIFT as they were specifically designed for these heels and fit right in
I do have quick question on the motor, if you don't mind. I currently have the Scorpion HKIV 4035-450KV and like you have mentioned, it certainly will not work with the belt tension plate or main plate for that matter. The plate mounting holes are 30mm diameter spacing and the Scorpion is 25mm and 30mm diameter spacing as pictured. So I looked into the EGODRIFT 4035-460 as you have used and the technical drawing for the EGODRIFT is the same as the Scorpion on paper and is also 25mm and 30mm diameter spacing as pictured. So I am curious if the technical drawings are inaccurate on the EGODRIFT and they are actually 30mm diameter? Right now, I am not seeing a direct drop in, unless I have an older plate or something.

On another note, it also looks like the main plate for the motor mount is setup for 30mm diameter spacing as well and as you see pictured, with the 25mm spacing holes, there is no adjust-ability for the slider plate to move forward and aft to tighten and loosen the belt. Maybe I am missing something and this is a very noob question, just want to make sure before I order up the motor from EGODRIFT.

Additionally, I have some 6061 aluminum plate and can design and make a slider plate to work with the scorpion motors. However, with the main plate at 30mm spacing, there is no way for the slider plate to work with the 25mm diameter spacing holes. Unless you use two screws only, then it will work just fine. But, I would think you would want all four screws installed. Again, may be a noob question, but the only bad question, is one not asked? Thanks

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I did the same research on both motors hole spacing and found the Scorpion motor and the drawing of the EGODRIFT motor are the same.

Oblonging the motor sliding plate holes will work. The issue with using the 2 short spacing holes is tightening the screws. The pulley sits directly above the 2 bolts. It can be done, I've done it but later found that making a belt tension adjustment was a pain. In the end I used only 2 bolts to secure the motor.

I did not use the bearing block. I think having 2 bolts is useless and does not do any support without the 3rd bolt. This is a poor design.

What I did do was oblong the main motor mount plate so that the sliding plate had full travel in both directions. This allowed more room for the belt to fit over the pulley without having to "totally" revove the motor. Still a tight fit but doable. Even easier if you remove the motor pulley top hat. There's loc-tite on the 3 screws so heating the pulley to soften the screws will prevent stripping the hex socket.

Oblonging the main plate holes is not necessary but I did do it to get an idea if its worth doing.

What I found worth doing is drilling an acess hole on the top frame to get a direct angle on the motor pulley set screw. I found drilling a straight hole from the corner or ends of the frame. Then reposition the drill bit and angle the straight hole towards the motor shaft. This made it easier to get to the pulley set screw without the possibility of stripping the hex slot.

The middle drilled hole will NOT work if you have all 4 motor bolts installed. I found this out after the fact so I drilled another hole in the corner.

I also marked the top of the motor shaft with red nail polish to indicate the flat spot. The same on the motor pulley. Now by aligning the 2 red marks I can target the flat spot visually and easier.

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06-06-2020 06:28 PM  10 months ago
Spookyeng

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Meridian, ID USA

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Girard Ibanez I did the same research on both motors hole spacing and found the Scorpion motor and the drawing of the EGODRIFT motor are the same.

Oblonging the motor sliding plate holes will work. The issue with using the 2 short spacing holes is tightening the screws. The pulley sits directly above the 2 bolts. It can be done, I've done it but later found that making a belt tension adjustment was a pain. In the end I used only 2 bolts to secure the motor.

I did not use the bearing block. I think having 2 bolts is useless and does not do any support without the 3rd bolt. This is a poor design.

What I did do was oblong the main motor mount plate so that the sliding plate had full travel in both directions. This allowed more room for the belt to fit over the pulley without having to "totally" revove the motor. Still a tight fit but doable. Even easier if you remove the motor pulley top hat. There's loc-tite on the 3 screws so heating the pulley to soften the screws will prevent stripping the hex socket.

Oblonging the main plate holes is not necessary but I did do it to get an idea if its worth doing.

What I found worth doing is drilling an acess hole on the top frame to get a direct angle on the motor pulley set screw. I found drilling a straight hole from the corner or ends of the frame. Then reposition the drill bit and angle the straight hole towards the motor shaft. This made it easier to get to the pulley set screw without the possibility of stripping the hex slot.

The middle drilled hole will NOT work if you have all 4 motor bolts installed. I found this out after the fact so I drilled another hole in the corner.

I also marked the top of the motor shaft with red nail polish to indicate the flat spot. The same on the motor pulley. Now by aligning the 2 red marks I can target the flat spot visually and easier.
Two bolts are going to be all you can use, it would be great if the motor had 30mm spacing all around then it would be perfect. You could use four bolts and the bearing support. I will not be using the bearing support either, unless I want to design a plate... which I think would be a fun project. However, it might be the same as my servo re-location and bracket design, the effort might not make enough difference to be worth the time and material cost. However, I already have a design in mind! It also looks like our mechanics are slightly different, and I have access to tighten the set screws for the motor pulley.

I also removed the motor pulley top hat to fit the belt on during some dry fit I did last night. I did get mine out easily but, I did order some replacement screws though and will use new screws when I put the pulley back together.

I am also going to keep my assembly thread on the SRCH website and might do a thread here, just with the modifications I do along the way. I can never leave well enough alone and I think the funnest part is building and thinking up new stuff! Talk soon.
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01-30-2021 07:18 PM  79 days ago
wrench3

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winnipeg

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hello, I am new to the site, so I hope I'm doing this correctly. I noticed on your 412 la fire build, the swashplate setup you have is the 2 shaft type(looking from the side). We are building two helicopters from Roban. The 700 Seahawk and a 700 Bell 429. on my 429 I have a single shaft just like the manual shows having the three servo lengths 2x 81 mm and 1 at 112mm. On the Seahawk, it has the 2 shaft type like yours. The manual shows same length as mine but they clearly are not right. What was your three linkage lengths on the 412?
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01-31-2021 09:42 PM  78 days ago
Spookyeng

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Meridian, ID USA

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wrench3 hello, I am new to the site, so I hope I'm doing this correctly. I noticed on your 412 la fire build, the swashplate setup you have is the 2 shaft type(looking from the side). We are building two helicopters from Roban. The 700 Seahawk and a 700 Bell 429. on my 429 I have a single shaft just like the manual shows having the three servo lengths 2x 81 mm and 1 at 112mm. On the Seahawk, it has the 2 shaft type like yours. The manual shows same length as mine but they clearly are not right. What was your three linkage lengths on the 412?
Hello,

I don't have the upgraded lever set on my Bell 412 and have the single rod, so I will not be able to give you a measurement. I did do some modifications on my servo layout, but the servos are in the same location/distance, just turned 90 degrees. However, the only thing that I can offer, is that I don't go by the measurements in the manual. I get a rough measurement with all the levers at half stick/hover pitch and then fine tune the lengths to make sure everything is at 90. I am not sure if that helps or hurts and I know it does not answer your question with specific lengths, but I just make them the length to get the correct geometry at hover pitch.

I will be test flying mine, hopefully in the next couple of weeks Here is where mine is at now.

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HomeScale✈️AircraftScale HeliRoban Scale Helicopters › ROBAN 412 800size BUILD THREAD
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