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Posted by 3DeltaFly | Dec 11, 2011 @ 05:26 AM | 6,310 Views
How do you turn the 1.5 Buck into a 2.0 Buck? By modifying it from wire to carbon fiber main gear:

Wire to CF main gear conversion notes:

Once the landing gear bay is opened up, it is filled in with custom cut spacers made from 1/8" thick Lite-ply, each glued in place with 30 minute epoxy.

The first spacer is carefully sanded and shaped to rest plumb against the bay sides and most importantly nice and level on fuselage's CF torsion tubing (the CF tubes that extend from the firewall back to F4). The remaining Lite-ply spacers are then fitted, stacked, and epoxied one by one onto the first spacer (and glued to all 4 sides of the bay opening) thus producing a sturdy main gear mounting block just over 5/8" thick. An additional spacer made from 1/16 hardwood ply tops off the stack / gear mounting block. This last spacer (#6) was required to provide the CF gear to fuselage sides clearance, to avoid trimming the fuselage's sides at the bay opening.

Attachment of the 47/48 Vyper CF main gear to the Lite-ply landing gear block is made via 4-40 machine screws and blind-nuts.

Additionally, I used the standard 3DHS aluminum axle kit made for the Vyper CF main gear, and cut slots in the wheel pants extending up into the original axle hole to allow the pants to slide in place on the aluminum axles. Have a look at the Vyper or other 3DHS planes (manuals) for details on how the wheel pants are slotted.

This modification is very sturdy as proven by repeated gear plopping harrier landings. No signs of stress to the fuselage or gear in many many flights / landings since completing the "upgrade" in early October 2011.
Posted by 3DeltaFly | Oct 09, 2011 @ 01:06 PM | 4,553 Views
The Extra MX with Thrust 50 motor is typically powered via 6S LiPo. The battery tray accommodates using either a single 6S pack or a pair of 3S packs wired for 6S. Armed with a goodly amount of 3S packs I've been experimenting with a more convenient way to use the two 3S LiPo system. Additionally, I've been testing the use of 4mm banana connectors to see how they will hold up. Not a single continuity problem in over 300 connect/disconnect cycles on my test plane (PA Extra 260). Now I've moved on to testing the banana connectors on the MX; see photos. The 4mm banana connectors make for a quick 6S configuration of a pair of 3S packs without the need for an additional wiring harness.

As an added convenience feature for quick-change out of the packs on the MX, I've constructed a lite-ply aft LiPo pack support box and bolted it to the battery tray. The ends of the packs "plug-in" to foam lined square slots in the lite-ply support box, which eliminates the need for 2 of the rear position hook-N-loop battery straps; see photo. This has been working well, and the next step is to move from the lite-ply constructed prototype to CF materials.

On a cautionary note; I've found that there are lots of 4mm banana connectors available from different distributors. Quality varies widely, and on some connectors the gold plating is extremely thin. It goes without saying, especially for high current battery connection applications, use only the highest quality connectors available.
Posted by 3DeltaFly | Oct 02, 2011 @ 05:00 PM | 4,839 Views
Building and flying radio controlled model aircraft has got to be one of the most enjoyable hobbies around, and has been a favorite of mine for over 25 years. There are easily hundreds of companies engaged in on-line retailing of radio control model aircraft, aircraft kits, parts, accessories and radio control systems in the USA alone. Here are a few favorites from whom I've purchased electric flight related r/c items and planes.

Advantage Hobby, web site: http://www.advantagehobby.com

Authorized Spektrum / Horizon Hobby dealer + many others, extensive line of electric aircraft, accessories, hardware, and much more. Smooth web site navigation, good on-line ordering experiences, generally fast order processing and shipping. Register on-line through the web site and receive discounted pricing.

All-E-RC http://www.allerc.com

Nice offering of quality LiPo (Li-Polymer) battery packs and other electric flight products. This is my go to source for Hyperion LiPo packs.

Amain Hobbies, web site: http://www.amainhobbies.com

Authorized Spektrum / Horizon Hobby dealer + many others, smooth web site navigation, good on-line ordering experiences, generally fast order processing and shipping.

Price discount codes available via periodically e-mailed news letter. Visit AMain Hobbies website to sign up.

BP Hobbies, web site: http://www.bphobbies.com

Nice assortment of aircraft, servos, accessories, hardware, inexpensive building materials - i.e. Carbon Fiber, and much more. Smooth...Continue Reading