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Trex 250 SE Flybarless: Updated 10/5/10

Posted 08-22-2010 at 09:26 AM by Silverexpress01
Updated 03-05-2013 at 03:15 PM by Silverexpress01

Follow down for updates:

Weight RTF:
Most current state is about 250-260 grams.

Mechanics
- Trex 250 SE Kit (No Electronics - Ebay $139.99 USD)
- KDE CNC Bottom Plate
- Boca Bearings for mainshaft
- Align 205mm carbon blades
- DIY carbon tail rotor push rod
- 15T pinion
- 120T main gear
- Microheli CNC side braces (from MH FBL head kit)
-37mm tail blades on very windy days
-40mm tail blades...
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Notes/Links/Etc on the Trex 250

Posted 06-16-2010 at 11:15 AM by Silverexpress01
Updated 06-24-2011 at 05:23 AM by Silverexpress01 (Just trying something new.)

Settings for Castle Creation's Pheonix 25 amp ESC:
http://www.helifreak.com/showthread.php?t=290375
http://helifreak.com/showthread.php?t=264278
http://helifreak.com/showthread.php?p=2429481
http://www.helifreak.com/showthread.php?t=290679

Fixing a warped main gear:
http://www.helifreak.com/showthread.php?t=294375

Balancing your Heli:
http://www.helifreak.com/showthread.php?t=304630

Gyro's on Real Helis:
http://www.rcuniverse.com/forum/m_79.../tm.htm#790697...
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Old

The Gaui Hurricane FBL

Posted 06-12-2010 at 09:54 AM by Silverexpress01
Updated 05-05-2011 at 09:16 PM by Silverexpress01 (Updated with new faster and stronger servos)

Weight RTF:
302 grams

Electronics:
MKS DS470 cyclic servos @ 5v using 25amp ESC/BEC
JR DS290g tail servo @ 5v using CC 25amp ESC/BEC
Castle Creations 25amp ESC (using Governer set rpm)
Skookum SK-720

Mechanics:
Stock Hurricane 200v2 FES with belt tail rotor
Align 205m Carbon Blades
Gaui Carbon tail rotor push rod
Align Trex 250 landing gear struts

Comments:
Simplicity.
Replaced the slow but...
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What I've done with Tail Gyros

Posted 06-02-2010 at 03:05 PM by Silverexpress01
Updated 03-12-2011 at 06:55 PM by Silverexpress01 (Misc Info)

Had a few tail gyros on hand after I switched to FBL's. So I installed them into this plane.


Note: A gyro won't save you from a crash since all it does is "dampen" unwanted drifting - in an airplane this is represented as unwanted roll, pitch, and yaw. Also, it will not self level the plane. Because it dampens drift, it will in essence make your tiny parkflyer fly like it had more mass - an object that is tough to push...
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Turning the Trex 250 SE into a Weight Weenie - For Performance

Posted 03-02-2010 at 09:30 AM by Silverexpress01
Updated 04-23-2011 at 09:03 AM by Silverexpress01 (Changed Topic)

Starting weight as noted above: 344 grams

Removal of Lights and RPM sensor: 314 grams

KDE Plate w/side screws = 6.40 g vs OEM Plastic w/side screws = 3.57 g

Hi-tec HS-5065 metal gears = 2.70g vs Hs-65 carbon = 1.31g

Metal tail slider = 72 g vs Plastic tail slider = 52 g

Extreme Metal and Carbon Swashplate Anti-rotation bracket = 2.30 gr vs
Align plastic = 1.39 g
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