japim's blog View Details
Posted by japim | Feb 19, 2019 @ 05:07 AM | 2,030 Views
Here is another iteration (rev 8 actually) of the scale look a like of propeller for P-61 Black Widow.

This time fixed prop.
Bolted hub with 4 x M2 screws.
To maintain the best print orientation for strength the blades are printed on the back edge. But a clever support was needed to account for blade curvature.

This time parts are printed in ABS so I can achieve better surface quality after sanding.
I achieved 305g of thrust @ 94W that makes 3.24g/W.

Basically it is the best result among all tested propellers so far on this motor (Cobra 2208- 2000kV @ 2S) - including commercially available propellers.
I have not compared it to GWS props yet.

You can also see what is the difference between sanded and non sanded version: almost 25% in case of rev. 7
Posted by japim | Jan 31, 2019 @ 04:30 AM | 16,546 Views
I am slowly finishing printing of my own designed F8F Bearcat in 1:12 scale (ACES WWII R/C Combat class compatible).

One year of design process... I know I know - this could be faster, but I have had other things to do

Model is build in "conventional" way - not fully utilizing the benefits of organic style 3D printed internal supports.

Wings construction:
45 deg angled internal ribs
CF rods (1 x 6mm + 2 x 1.8mm) to be used as main strength members.
Segments attached with small tabs.
Due to wing chord length I had to split the segment in half way to fit on ordinary printer.

Fuselage construction:
Slices that have the channels for 6 CF rods 2mm diameter.
Each slice has "semi" stiffening formers that bind the channels for CF tubes at each slice end.
It works really well as even in a case of small wall fracture the fuse is still kept integral due to these stiffeners.
The fuse has separate belly.
Motor cowling is removable.
Motor mount attached to fuse & the CF rods glued joints.
Wings to be attached the RC combat style - alignment tab @ leading edge + 2 x 6mm aluminum tubes crossing the fuse + rubber bands.

Currently designed for 3536 motor 1200kV & 4S setup but 4108 600kV & 6S setup (3D lab print style) is also feasible due to removable/adjustable motor mount.

Fuselage has been 100% printed but not glued - just missing internals to mount servos and pack.
Wings are 85% ready - I am printing final pieces.

Model has not been weighted yet. I'll do that before I start final assembly.

Model is solid body type and the shell/reinforcement bodies are exclusively designed for Slic3r. I really disliked the way Cura 2.x was operating long time ago when I started the design process.
Posted by japim | Jan 15, 2019 @ 04:03 AM | 2,541 Views
During the Christmas break my son (17yrs) designed on his own a frame that combines all the best technical solutions from all the frames he has been flying over past 2 years.

Basic data: size: 5 - 5.2"
Frame weight (as pictured, w/o pack): 255g
FC/ESC - Kiss CC
Motors: Wildfire 2205 2666kV by DemonRC.eu
Cam: Caddx Turbo EOS2
VTX: TBS Unify Pro Nano
Antenna: Gem 5.8GHz by Actuna
RX: TBS Crossfire Nano with XF Race antenna
Props: 5x4.5 HQprop
3D prints: hobbyking flexible TPU filament.
Posted by japim | Dec 10, 2018 @ 10:48 AM | 2,181 Views
A friend of mine finished his Me 109 model from 3D Lab Print.
He was a very good R/C Combat flier, but haven't flown for couple years already.
Me 109 from 3D LabPrint was supposed to be his come back.
Weather was very bad for flying - rain + wind. White model on grey sky.
But he was very determined to make the maiden flight either way.

Maiden was OK.
Second flight was not so much OK...
3D LABPrint Me109 maiden + crash (3 min 4 sec)

Posted by japim | Nov 26, 2018 @ 04:16 AM | 4,734 Views
Development of my EPP P-61 Black Widow is in process (https://www.rcgroups.com/forums/show...plans-included)
This time I designed a folded 4 bladed, scale propellers.
Posted by japim | Oct 29, 2018 @ 05:28 AM | 3,069 Views
This time something different.
Something at the edge of engineering/modelling/3D printing and FPV.
A short movie showing and discussing the Runcam Sparrow Micro reinforced case and the 2 tricky parts: 1. hot soldering iron brass insert installation & 2. lens thread tapping.

Runcam FPV camera reinforced case with brass inserts and thread (14 min 20 sec)

Posted by japim | Oct 15, 2018 @ 02:15 AM | 2,963 Views
Again an excellent skills of my son - this time in the middle of R/C combat fight:

Racing Drone vs Aircombat (4 min 59 sec)

Posted by japim | Sep 18, 2018 @ 02:54 AM | 3,305 Views
I just love this plane. It flies so well and I have lots of fun + it looks just awesome in the air. Maybe one day I will build a bigger version.

Follow me - flying behind P61 Black Widow (4 min 51 sec)

Posted by japim | May 29, 2018 @ 08:02 AM | 3,491 Views
R/C Aircombat is always a fun - better than FPV:

I Bitwa o Zalesie ESA 2018 best cuts, best moments, best crashes (4 min 48 sec)

Posted by japim | Jan 22, 2018 @ 03:26 AM | 15,961 Views
Exactly 2 years have passed since the P-61 Black Widow profile has been designed.
Yet another flying in winter time in Poland:
P61 winter time 2018 (4 min 56 sec)

Posted by japim | Jan 15, 2018 @ 02:03 AM | 4,157 Views
Fast & low - another P-61 FPV crash (3 min 20 sec)


One more crash and she will be completely re-build - at least the center fuse.
Posted by japim | Jan 04, 2018 @ 06:28 AM | 9,212 Views
After last crash I had to make a re-match with my soccer field

P-61 FPV rematch (5 min 23 sec)

Posted by japim | Dec 29, 2017 @ 03:33 AM | 4,941 Views
Some FPV flying with P-61 and a crash at the end...
P-61 FPV crash (4 min 59 sec)

Posted by japim | Aug 08, 2017 @ 12:09 PM | 4,376 Views
First fight of the EPP version:
P61 EPP version - maiden + first ESA combat fight (3 min 35 sec)

Posted by japim | Nov 15, 2016 @ 09:25 AM | 4,587 Views
My maiden FPV flight (I am flying P61, my son is chasing me with his Lisam 210 race copter):
FPV Gate challenge (4 min 1 sec)