JLT_GTI's blog View Details
Posted by JLT_GTI | Nov 16, 2018 @ 06:16 AM | 5,342 Views
Last spring there were the seasonal classic Lidl hand tosen glider for just 10€ .. so i decided to pick a couple of them and go the full road moding not just for RC flight.. but also for fun FPV.. to do something like a poor man's "wraith micro" mini fun plane..

I was going first to build it simple with 2/3 servos (single aileron servo) and a 1806 motor in the front.. but again i changed my mind and decided to use the "more complex but simpler" solution of using separated servos in the wings..and making it a twin motor with 2 1806 motors.. i have made allready some twin motors so the increased thrust and deleting torque ..as well as placing the motor in a more near the CG position were quite attractive.

Also i flattened the wing dihedral and inserted a carbon rod in the wing.. tail feather and fuselage belly..ailerons go in the outer part of the wing.. i saw guys doing the RC mod , not removing the dihedral and putting the ailerons in the inner flat part of the wing and the results werent much good (unless you are ok with a slow roll rate) and i wanted a fast roll

So ended up using 3 HXT500 5g servos ..2 12A ESCs with 2A bec (using only one BEC) and 2 DYS 1806-2300kv motors and using normally a 1300/1400 3S (but it will take a 1300 4S as well)

For FPV i used one Eachine TX526 i had arround doing nothing (broken connector, so resoldered another) and a runcam micro Swift2 wich has built-in OSD very helpfull to check voltage and time

after a messy maiden (due to inverted trims due to mistakes made my me during programming) once trimmed to my surprise the plane flies amazingly good .. its more stable than a wing .. trackes better .. is so much fun and maneovrable (had to dial expo for the roll).. its allready a fav for fast low altitute FPV fun

Lidl Chuck glider FPV (4 min 34 sec)

Posted by JLT_GTI | Oct 27, 2018 @ 12:22 PM | 4,205 Views
Posted by JLT_GTI | Oct 28, 2017 @ 07:56 PM | 5,020 Views
Finally finished my APM based FPV plane wich is built temporally on my experimental Kondor Depron scratchbuilt plane..

once fixed the GPS module problems i finally maidened it and to my surprise everything worked .. the OSD (MinimOSD) stucks a bit from time to time but on the APM part (the important stuff) everything worked beautifully even being the first flight and using stock PIDs..
tried STAB mode , Loiter mode and a RTL .. you can see all here

APM maiden flight. Testing modes STAB, LOIT and RTL. KondorFPV (8 min 19 sec)

Posted by JLT_GTI | Oct 23, 2017 @ 08:20 AM | 4,878 Views
it really works very nice

Runcam Swift low light run (3 min 55 sec)

Posted by JLT_GTI | Jul 28, 2017 @ 07:46 AM | 5,500 Views
This is those wings 3rd "life" .. after i made the mk1 years ago the poor guy had a troubled (unrelated to itself) life until it met its end in the roof after i ran out of Lipo (stupid me) and wind drifted it until it pefectly landed on a 3rd floor roof.. (the landing was perfect.. the rescue operation however killed it)
The wings were intact however so time later i tried doing a Bobcat out of them (enters the mk2) with a rear motor, twin boombs and a short pointy fuselage.. it was pretty but a failure as a flying machine..it flew (and never crashed..ironically) but it was an utterly bad flying machine.. slipery..unstable .. pulling elevator made it bank during climb or loop.. imposible to do anything aerobatic save rolls.. quite unpleasant to fly. i tried lowering the CG by putting the Lipo bellow the wing.. making the tail stiffer.. but nothing worked.. so i forgot about it for some time until recently i decided either i redo it again for a third (and final) time or i throw it into the bin

Of course i had to have a third go.. i had 5 Cobra 12A ESCs laying arround ..not good for miniquads .. but it meant i had plenty small ESCs arround.. so 2 Racestar cheap motors and 1 UBEC (i dont trust a 1A bec to handle 3 servos) and a bit of more depron later ... born the mk3!

and now it finally flew properly..beautifully and for now free of trouble..

enlarging the tail surfaces (elevator.. as vertical stab has actually half than before with the twin boom.....Continue Reading
Posted by JLT_GTI | Oct 19, 2016 @ 08:50 AM | 7,491 Views
maidening this little fella

Eachine QX90 first flight (1 min 31 sec)

could use more expo or lower rates as it comes stock is unflyable indoors in acro mode.. angle mode is fine tought and video works really good
Posted by JLT_GTI | Jun 06, 2016 @ 08:51 PM | 8,043 Views
So... you are flying some FPV nice and calm ..ejoying the views out in the coast.. then you notice its droping rain over you (and your electronics) ... then instantly see rain throught the FPV camera...

so "emergency" return ensues

FPV expedite landing... is that rain? (0 min 58 sec)

Posted by JLT_GTI | Dec 25, 2015 @ 02:42 PM | 9,069 Views
a few weeks ago we gathered (by chance) 3 FPV planes and 2 FPV quads flying at the same time (plus others non-FPV players) ... i had my Elektro Rookie adapted for simple FPV (basic Hobbyking OSD but no RTH or LRS or any fancy stuff) and we had a lot of fun trying (not very sucesfully) formation flying and chase each other.. This is one of those moments when you really have fun on FPV instead of fearing something failing, losing video or losing radio link...

Fun FPV flying in group G-OSD2 w GPS (10 min 59 sec)

Posted by JLT_GTI | Jun 07, 2015 @ 12:27 PM | 9,590 Views
Posted by JLT_GTI | Dec 18, 2014 @ 07:40 AM | 11,515 Views
Finally after months of waiting parts... building .. trying... burning out a camera with an accidental short ..waiting for burned camera replacement... and so ... finally i managed to put it together with FPV gear working

Its a ZMR 250 chasis with OverCraft's PDB..


-Cobra 2300Kv motors with Cobra 12A ESCs and 5030 HQ props
-FrSky D4R-II Rx in PPM mode
-Flip32 controller board (AcroNaze32 cousin)
-Boscam TS353 400mW 5.8Ghz video Tx
-Sony Effio-V 800VTL camera

It flew very nice (my first multicopter, so nothing to compare it with but it just flew sweet and easy with no trouble at all) without FPV gear...so now it remains to see how she flies WITH FPV gear on
Posted by JLT_GTI | Dec 23, 2013 @ 04:44 AM | 12,844 Views
This is the relativy known GuanLi CL-415 1390mm wingspan..

A kit that can be obtained at hobbyking (tought with diferent white-red livery now) and other chinese stores..

Its a quite detailed kit for the price , but nothing is free.. kit came with some defects (broken wing support, twisted parts.. ) and then there is the problems of the kit itself (no channels for wires in the wings .. they asume you have to just tape them under the wings) wings lack a spar and are suposed to go with struts.. and its made from EPS wich is soft and brittle as butter.. but its a beutifull seaplane.

My unit was an empty kit completed with

-2X D2830-1000 motors
-2X 25A Turnigy Plush ESCs
-4X HXT900 9g servos
-FrSky radio system with voltage sensor
-2X MasterAirScrew 8X6X3 counter-rotating propellers

mods to the kit from my part were:

-Relocation of motors using a new system
-Glassing the belly
-Opening 2 channels in each wing to root both servo and motor wires inside the wing
-Join and glue wings together to eliminate the need of struts (cleaner and faster to mount in the field), glued both wings with epoxy and then inserted a carbon rod from nacelle to nacelle

-Livery changed to the Spanish air force 43th Wing firefighting unit

...Continue Reading
Posted by JLT_GTI | Jun 27, 2013 @ 08:31 AM | 11,908 Views
I decided to take a shot of most of the fleet (2 planes missing in the photo as they are micros). Even tought its partially cheating as the CloudsFly (tail number 2) is tecnically dead.. only the rear and wings remains of one of the most rewarding planes i had

Posted by JLT_GTI | Apr 27, 2013 @ 07:01 AM | 12,278 Views

And so far this is the current form of the scratch foamy after some crashes and tweaks..

Left is thinking a way to fit a removable landing gear wich doesnt collapse or rip off the foam in hardish landings..
Posted by JLT_GTI | Apr 26, 2013 @ 05:26 AM | 17,964 Views
So we have had (and still is not over since its raning) one of the longest raining seasons i can renember..its been esentially beeing raining almost non stop since november to april with maybe 2 day breaks during wich wind was unbearable).

So last febreaury while bored at home due to the mandatori grounding, since i still had some 3mm depron arround i decided to give it a try and make my first 100% scratch and "i made it as i go along" plane..

Now it would been way easier to make if i had gone the profile way.. but for some reason i decided to go the inmenselly harder way and make an actual fuselage box

The plane is made from depron , wing uses a KF2 airfoil , a CF spar for the wing and a couple in the fuselage for structural integrity.. I would prefered a dihedral wing but thats quite more complicated to build than a straight.. specially from a structural point of view

As for electronics i used the old original motor+ESC combo from my now defunct CloudsFly , a 2200Kv motor and a 20A ESC... not the best sollution for a foamie wich is not intented to go fast.. but since i just wanted to make something that flies i just put it in a 6X3 prop so drain keeps under control.. 2 HXT900 and 1 HXT500 servos i had arround and an Orange Rx i had

...Continue Reading
Posted by JLT_GTI | Oct 26, 2012 @ 06:51 AM | 12,850 Views
FPV Escuela con Ikarus OSD. Pruebas 3 (14 min 12 sec)

Yeah i know its lame for FPV but was an achievement for me in the video only shows 950m but we did a 1150 one next.. unfortunatelly i accidentally deleted it
Posted by JLT_GTI | Sep 17, 2012 @ 03:55 PM | 12,866 Views
So its bye bye summer , days are allready getting shorter and now here comes the autum where usually no much sloping can be done until practically winter..

So we went to our lovely Cabo Peñas slope in Asturias and did a bye summer slope day

...Continue Reading
Posted by JLT_GTI | Sep 14, 2012 @ 09:37 AM | 12,940 Views

Still have to fix some fidling in the radio.. but so far lookin good step by step..

About eficiency.. it made 11kms with 1.450mAh in a no-thermal no-wind no-slope lift day in 20m ...seems quite reasonable

Posted by JLT_GTI | Sep 07, 2012 @ 01:43 PM | 13,511 Views
FPV Modelhob Escuela Ikarus OSD 2 (13 min 1 sec)

Well , the video is 1 month old but at least is working..

Thinks look good except for the catastrofic (and scary) loss of singal that can be noticed in the video (RSSI signal is top right corner.. you can see how it falls to 0 sometimes)..
We believe the problem is the receiver , an old FM Futaba R137F (i tought i was going to be good since its original futaba and even today is quite expensive) but conversations with guys who are into the FPV stuff revealed that old FM Futaba Rxs are not any good for FPV and are particulary bad if modded to get RSSI out like mine was ...

Well we replaced what we believe is the problem for a proven Corona RP8D1 wich is famous in FPV world and everyone agrees that is very reliable..

Lookin forward to next flights to see if thats fixed.. if not i can allways go to 2,4Ghz FrSky with those sweet Rx with PPM and RSSI signal allready out since i allready own a FlySky 9X radio..

So far numbers look good.. plane was carrying 2 batteries, one 1000mAh for FPV stuff (OSD, videoTx, GPS) and a 2200mAh for the motor/servos ... acording to the OSD it did 11km overall in half hour (plenty of gliding since the Escuela is really good at it) with what turned out to be 1250mAh .. plane compartments was designed to carry up to 2X2200 so range shouldnt be a problem.. actually its the video Tx what limits more now the range since the FPV system drains overall 1A so the 1000mAh batt means 1 hour maximun from switching on to safe in ground.. still in the rear compartment a 1600mAh fits so 1:30h should be easy and doubt flights will be that long
Posted by JLT_GTI | Jul 06, 2012 @ 08:17 AM | 14,045 Views
After months of planning, building, learning, understanding, trial and error and so finally the FPV plane is ready to go..

now to find a nice day/place for testing

...Continue Reading
Posted by JLT_GTI | Apr 09, 2012 @ 11:13 AM | 13,615 Views

Its a start....