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09-15-2015, 04:25 AM | #1 (permalink) |
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Join Date: Apr 2015
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Velos 880 Building Tips
This is going to be sticky. We will post here some building tips and things that need our attention. Please do not reply to this thread in order to keep it short
First comes the larger tail spacer that was included in the first kits. Now this part has been replaced with the correct sized one and replacements have been sent to the owners. Please check the photo to see the difference between the correct spacer and the wrong one. In case someone does not have it, please contact us and we will sent replacements ASAP. |
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09-15-2015, 04:34 AM | #2 (permalink) |
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ESD avoidance Mod
ESD mod is a common and simple task that helps us avoid failure to our electronics during a flight. Following a few
simple steps we can insure that ESD will never happen in our heli. We need to use two wires. One of them connects the tail case with the boom. And the other connects the boom with the main plate. The holes in the boom are 2mm and we are fixing the wires there by using 3mm self‐tapping screws. You can split the wire that connects the boom with the main plate with a bullet connector in order to easily remove the boom from the frame if you need to. Our target is to have electrical continuity between the tail case and the main plate. We can verify that by using an ohm meter. This is not the only way to do it, you can use different ways to mount the wires. IMPORTANT Do not sand the boom in order to remove the clear coat and achieve continuity, use wires instead. |
09-24-2015, 10:04 AM | #3 (permalink) |
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Angled Bearings
For greasing the main angled bearings we can use the same type of grease used on the main gear or any other common bearing grease.
Usually water proof grease is stickier and lasts longer than other types of grease. (mostly on main gear and pinion) When disassembling for cleaning and re greasing make sure you are not forcing the angled bearings out from their core as angled bearings are easy to come apart and loose the balls. There are on purpose machined holes on the main plate and axle holder to make disassembly easier. You can use a 3mm punch tool through the holes, gently apply some force to the outer part of the bearings and push them out of their case. Last edited by Velos Rotors; 09-26-2015 at 12:37 PM.. |
09-27-2015, 05:55 PM | #4 (permalink) |
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ESCs SETUP and Velos 880
There are two options for configuring the ESC’s on the Velos 880.
The first option is to use the FBL unit’s internal governor (not the ESCs internal governor) and feed the throttle signal to both ESC’s via a Y lead. You need to connect an RPM sensor to the FBL unit that reads from one of the two motors, or if the ESCs you are using have a build in rpm sensor with an rpm output cable then you can use one of these to feed the FBL unit. The above method insures that the ESCs are perfectly matched and no further adjustments are required. Option two (using ESC’s governor): If the FBL unit does not support electric governor or if the ESCs do not support external governor, then: Follow the ESCs manual and activate the internal governor mode in both ESCs. In this case, it is advised to not use a Y lead to match the two ESCs together. Instead, connect one of them on the throttle channel, the other one on an Aux channel and then mix these two channels together. That way you can increase or decrease the throttle percentage of the one in relation to the other.This is useful in case you need to equalize the battery drain between the two motors. (Trim the Aux channel in relation with the throttle channel) For any of the above methods make sure to calibrate the throttle end-points to both ESCs with your TX. In addition, the setup parameters should be identical in both ESCs no matter which method you are following. |
01-18-2016, 05:44 AM | #5 (permalink) |
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SKOOKUM FBL SETUP SETTING
These are the settings we are using for the skookum 720 fbl unit. The same settings can be used for the skookum sk 540 fbl unit.
The following photo shows a 3D setup for the Velos 880 that we are using. Usually at 1800 rpms. Please note that the following setup is used with the balls on the swash servos 18mm away from their center and +- 11 degrees of pitch. The ball on the tail servo horn is placed 17.5mm away from the center. Gains: 50 for both cyclic and tail. (Maybe tail needs a little fine tuning). With the above settings you get a smooth and balanced behavior without any extreme tendencies. Note: If you have mount the servo balls at 20mm you need to get lower at the swash gain (about 40). It is not recommended to mount more than 21mm away the balls from the center of the swash servos. |
03-15-2016, 02:11 PM | #6 (permalink) |
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Velos 880 Gear ratios
Velos 880 Main Rotor gearing information:
Metal Main Gear: 72T Metal Pinion Gear: 19T Autorotation Pulley: 60T Stock Pinions: 22T Gear Ratio = (60/22) * (72/19) Gear Ratio = (60/22) * 3.79 Gear Ratio = 227.36/22 Gear Ratio = 10.33 (for the stock 22 pinion) Main rotor rotates 10.33 times slower than the motors. Or for any other pinion the gear ratio will be: 227.36 / (teeth of the pinion) Velos 880 Tail Rotor gearing information: Front Tail Pulley 37T Back Tail Pulley 25T Tail Gear Ratio (in relation to the main rotor): = (19/72) * (25/37) = 0.2638 * 0.6756 = 0.1782 The ratio number is less than one which means that the gearbox is not reducing but increasing the rpms to the tail rotor in relation to the main rotor. If we divide that number by 1 then we can get the most commonly used tail ratio number which in case of Velos is: Tail Gear Ratio = 1/0.1782 Tail Gear Ratio = 5.61 Tail rotor rotates 5.61 times faster than the main rotor. Tail Gear Ratio (in relation to the motors): = (60/22) * (72/19) * (19/72) * (25/37) = 2.727 * 3.789 * 0.264 * 0.676 = 1.84 Tail rotates 1.84 times slower than the motors For verification: The tail rotor rotates 5.6 times faster than the main rotor and 1.84 times slower than the motors. Then the main rotor gear ratio will be: 5.61 * 1.84 = 10.32 which matches the ratio we found in the beginning. |
07-23-2016, 08:50 AM | #7 (permalink) |
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Join Date: Nov 2009
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which swashplate configuration it uses? H-1 or H-4?
I have a Brain/Ikon Gyro, would that work? |
10-11-2017, 12:09 PM | #8 (permalink) |
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Join Date: Apr 2014
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How do you balance the swashplate . Is there any tool.
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10-16-2017, 06:22 PM | #9 (permalink) |
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Join Date: Dec 2012
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No tool...but with the swashplate links set the same length and the servo arms all set horizontally when at zero pitch the swashplate will be level.
Most important is to keep the servos happy and not binding against each other. If I find, after hooking up the last swash link, that I have a servo humming slightly I'll get into the servo setup portion of the Velos program and bump the servo a single step...if the hum got worse I know I went the wrong way so I bump the servo a couple steps the other direction. If the servos aren't binding they will be quiet through a complete actuation from full negative to full positive pitch and at the extremes of cyclic.
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