PRINT. BUILD. FLY.
CHALLENGE:

Twin Micro Turbo-Prop Scale Model

RC

DOWNLOAD
Get the Free STL Files

& Print NOW

DESIGN & MODIFY
Use the Provided CAD Files
to Apply Your Strategy Further

PRINT & BUILD
Designed for Fast Printing
& Fast Assembly

FLY & SUBMIT

Follow the Rules Below

& Show Us What YOU Got!

Due to many on vacation, & asking for more time to order electronics, The Deadline has been extended to July 19th! LFG GUYS!!!

DESIGNERS,

HOW GOOD ARE YOU? GOT MAD SKILLS?

WELL HERE'S A REALLY QUICK & DIRTY ONE FOR YOU:

GET THE PROVIDED 3D PRINTED PROPS TO SUSTAIN FLIGHT FOR THIS CRAZY TWIN MICRO AIRLINER & WIN. DASS IT!! IT'S A QUICK PRINT IN MOSTLY VASE MODE USING LW MATERIALS. WE GOT YOU MOST OF THE WAY THERE AND DROPPED THE FREE FILES BELOW! WE INCLUDED SOME SOLID CAD FILES SO YOU CAN TWEEK IT! INCLUDING THE PROPS & WINGS!

ADAPTATION IS REQUIRED. BUT IT'S NOT GONNA TAKE MUCH GUYS! REMEMBER, IT'S NOT ABOUT MAKING IT CRASH PROOF- IT'S ABOUT GETTING THE PROPULSION TO BE EFFECTIVE ..OR... BUILDING LIGHT ENOUGH TO MAKE IT WORK AS IS. OR BOTH.

YOU GOT THIS.

CHECK OUT HOW CLOSE WE GOT TO MAKING THIS THING FLY IN THE VIDEOS BELOW!

GOAL:

WINNER PRIZES

ALL HM3D DOWNLOADABLE FILES SITE WIDE FOREVER + ALL FUTURE UPDATES AUTOMATIC FOR LIFE

HM3D 74X RETRACT DRIVER BOARD (SHIPPED) | $44 Value

HM3D 74X REALISTIC LIGHTING ELECTRONICS BOARD (SHIPPED) | $25 Value

$99 REIMBURSEMENT OF FULL TWIN TURBO-PROP SOLID CAD FILE WHEN PURCHASED BELOW

NAME, VIDEO, & PICS POSTED ON SITE HOME PAGE & SOCIAL MEDIA PAGES

VIEW 74X PAGE

TEST FLIGHT AT 8oz AUW & 50% THRUST TO WEIGHT COMPLETED

Goal Within Reach

RULES

No scaling, lengthening, or chopping of aircraft sections, except for aerodynamic purposes. Example- Increasing or decreasing wing panels for added lift or aerodynamic improvement is allowed. The aircraft must remain in the given scale, however.
Maximum Flight Weight - 9 oz (255 g).
The wings, fuselage, horizontal stabilizer, vertical stabilizer, nacelles, and other primary airframe components must be 3D printed.
The aircraft must use 3D printed six-blade 100mm - 105mm diameter propellers for propulsion. Scale-looking & functional propellers are the goal.
You may redesign or modify any supplied STL or STEP files. Competitors are encouraged to modify the supplied propellers, wing panels, & "Fuselage B" to improve performance.
If you purchase the full Solid CAD file for modification, you may use it to modify any parts that are not available in the FREE STL file package download such as, Landing Gear, Horizontal & Vertical stabilizers, or Fuselage sections for the purpose of component installation. HM3D will judge based on the amount of modification to the airframe outline & decide winners based on efforts to maintain scale features and dimensions.
You may use any electronics, hardware, adhesives, reinforcement materials, landing gear, bearings, carbon fiber, or construction methods you believe will improve performance while complying with the challenge rules.
Builders are encouraged to reduce weight wherever practical while maintaining structural integrity.
You may use the recommended BOM or any alternative electronics of your choice.

To be considered a successful completion, your aircraft must:

Utilize & demonstrate Nose Wheel Steering.
Display video of working Rudder (ground footage okay).
Take off from the ground under its own power.
Demonstrate stable, sustained flight.
Perform turns.
Demonstrate climbs and descents.
Return to the original takeoff area.
Complete a safe landing.

Submission Requirements:

Before midnight (local time) on Sunday, July 19, submit:

A video link showing the flight.
A complete list of electronics used.
A summary of any design or airframe modifications.
A brief explanation of your control setup and aircraft configuration.
Email submissions to: FlyHM3D@gmail.com

Winner Selection:

The first priority is a successful flight meeting all requirements above.
If no entrant completes every requirement, the best overall demonstration will be selected by HM3D up to one winner.
Up to 3 Winners- If multiple contestants achieve the goal, the TOP 3, chosen by HM3D, will be considered the Winners, & all 3 will receive the winner prizes.

FREE STARTER FILES

updated 7-3-26 0600
reloaded "cowl C.stl"

STL & SELECT STP AIRCRAFT FILES

STARTER PRINT FILES FOR HM3D CHALLENGE (ROUGH TEST MODEL)
FULL FLYING HORIZONTAL STAB
OPTIMIZED HIGH LIFT WING AIRFOIL & FLAP PANELS (ADDED AFTER LAST TEST)
SPAN: 735mm | 29"
LENGTH: 840mm | 33"
8 OZ FLIGHT WEIGHT & 50% THRUST TO WEIGHT RATIO (FROM LATEST TEST WHICH WAS NEARLY SUCCESSFUL)
NOSE STEERING
PRINT MOST SECTIONS IN VASE MODE WITH LW-PLA & 2 SOLID BOTTOM LAYERS
PRINT PROPS IN VASE MODE WITH SOLID BOTTOM LAYERS UP TO & BEYOND BLADE ROOT (up to 22 solid bottom layers depending on layer height)
USE SELECT .STP FILES TO MODIFY PROPS, WINGS, & "FUSE B" AS NEEDED

GET AN EDGE ON THE DESIGN & WIN

TWIN TURBO-PROP COMMUTER

$99

FULL SOLID CAD MODEL (.STP)

WIN. GET REIMBURSED $99

INSTANT DOWNLOAD
SCALE FEATURES
SEPARATED FLAP, AILERON, & RUDDER
FULL FLYING HORIZONTAL STAB
OPTIMIZED HIGH LIFT WING AIRFOIL
WIN CHALLENGE & GET REIMBURSED $99
PURCHASE UNLOCKS ACCESS TO ALL OFFICIAL FILES AT THE TIME OF RELEASE FOR THIS AIRCRAFT (INCLUDING SOLID CAD FILE & ALL FUTURE VARIANTS INCLUDING LARGER SCALE)
PRICE WILL INCREASE AFTER OFFICIAL AIRCRAFT RELEASE
CURRENTLY ONLY AVAILABLE DURING CHALLENGE