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JLT_GTI's blog
Posted by JLT_GTI | Dec 23, 2013 @ 03:44 AM | 2,373 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 | 2,290 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 | 2,849 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 | 3,934 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 | 3,429 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 | 3,400 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 Peņas slope in Asturias and did a bye summer slope day





...Continue Reading
Posted by JLT_GTI | Sep 14, 2012 @ 09:37 AM | 3,517 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 | 4,071 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 | 3,933 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 | 4,062 Views


Its a start....
Posted by JLT_GTI | Mar 22, 2012 @ 06:39 PM | 4,167 Views
Well.. this is it.. after 2 years of thinking , planing and mental works its time to finally begin the FPV project wich i considerate the ultimate goal in RC flying

After considering several planes (HK FPV plane, Bixler , SkyWalker.. ) i finally decided to once again use my very first RC plane , the good old Modelhob Escuela..

Several reasons came to this.. first i allready have one flying (toght i had installed the motor in the front and now i had to move it to a pod over the wings) , second its 3 chanel with motor ..wich means i have a plus spare chanel that i can use to control the camera pan easier, third it uses Clark-Y airfoil and its 2m wide.. wich means it can carry quite a payload and while not great for speed it still has a lot of glide and floating even in slow conditions and finally it has polidihedral since it only uses the rudder to steer so its quite self-stabilizing..

Many spaniard guys are using Escuelas as FPV ships all arround the country with many even refurbishing old worn out ones for it.. and all of them report happy so i guess its better for starting than some choices i had..

Ironically i had converted this bird from pure glider to motorglider last summer and mounted the motor in the nose and now i wanted the nose free (camera) and also as much internal space as possible...so i had to move it to a scratch built plywood pod over the wings.. also swaped the motor for one way more powerfull and moved the standard servos in the front...Continue Reading
Posted by JLT_GTI | Nov 15, 2011 @ 02:07 PM | 4,880 Views
My latest adition to the fleet its this HawkSky wich after doing some trials and "corrections" was finally upgraded and moded to HawkFighter (a HawkSky variant developed and sold by KillerPlanes site)





Actually is not actually quite the same as the HawkFighter .. the Hawkfighter apart from the mods i did its quite reinforced to make it practically crash proof.. i havent yet reinforced any area.

The mod is simple.. chop the wings at arround 17cms from the edge wich lefts the winspan at 104cm from the original 140 .. added a couple of wintip fins or winglets flat and downward wich are suposed to help the airflow in the wing edge and make the plane to be more stall resistant in low speeds..

Havent tried the plane without the fins so cant tell if they are working or not.. but the plane really is quite stable in slow aproaches and passes and it has to be practically stoped to tipstall and so far i havent got any tipstalls yet so i guess something is working there..

This mod changed the plane so much that its hard to believe it, specially when you hold the 17cm choped wingtips in your hand wich seem so small that you cant believe removing them makes the plane so different..

The plane now is awesomly aerobatic... the standard didnt wanted to roll at all .. rolls were hideously slow and nasty (it wanted to go in a diferent direction during the roll, even with aileron differential dialed) and that was with the wingtips flat (cortesy of the previous...Continue Reading
Posted by JLT_GTI | Aug 23, 2011 @ 06:22 PM | 5,197 Views
My good old (can you call old a 15 month plane?) Clouds Fly (aka AXN Floater) has had a lucky life so far.. it has had it share of crashes but really so far nothing too serious (i have seen pics of AXNs splited in half, broken wings, motor mount separated, nose broken off or totally smashed/splited, burned to a crisp.. you name it).. it has hit a tree (twice) it has smashed head-on on the ground after a loop dive, it has smashed into the side of a small hill landing..

Last week some weird low altitude mistake/glitch ended in a pretty mucho nose down smash against the ground.. still nothing to much serious but the nose was really bent this time.. i have had the CloudsFly nose repaired several times but the nose has been a bit "compressed" for a lot of its life actually ..

Not anymore.. i made my mind and decided to try on the AXN the famous "Elapor soup" wich consists in basically boil a big pot of water (as big to at least get the affected part in) and just when its about to boil (or if its boiling switch off the kitchen and let it get below boiling) and sumerge the affected part for some minutes..

And it works.. actually it worked so well that the nose recovered the shape of the original nose lost more than one year ago.. only "minus" its the EPO/EPP "bubbles" expanding but that can be mostly diminished using a spoon to "smooth" the surface "bruishing" it before the EPO colds down..

since one image is...Continue Reading
Posted by JLT_GTI | Jul 19, 2011 @ 10:38 AM | 7,955 Views




Well .. yesterday i got the landing gear and finished the conversion..

Now my Blade120SR its a Bell 412 Huey ... it even flies nice and all.. only drawback is it needs 60% power to hover rather than 40% as it needed before conversion.. (also its using now a bigger 850mAh battery rather than the previous 500 ones).. While this will make it more stable (more head speed) it will possible put more load on the electronics.. so i added 2 heatsinks to the motor (wich weight 10g between the 2...dont know if the sollution is worst than the problem)

total weight now is 140g.. it was 110g before conversion..

One advantage of this mod is that returning to stock configuration should be easy (unscrew landing gear, unscrew front fuselage support, extract main chasis, refit the tail boom , fit stock landing gear and fuselage and thats it, probably done in 15m)
Posted by JLT_GTI | Jun 25, 2011 @ 08:53 PM | 5,056 Views


Stupid of me i didnt showed that i added two yellow stripes in the bottom of the wings to distinguish when its upside down or straight.... since i was not clever enought to think about that when i applied a symetric decoration (and trust me... this thing looks the same from far away)
Posted by JLT_GTI | Jun 07, 2011 @ 05:30 AM | 5,210 Views
Well.. proyect is flying.. i would say complete but since i probably will change the motor covering and its using the spare motor i dont think its over..

Escuela de ModelHOB electrico volando ladera en la Campa Torres (10 min 41 sec)



Plane has a really marqued tendency to climb nose up when applying power.. cured by programing a mix so it gives elevator down when giving power...
Finally weight was maintained from the original, maybe 30g were gained...

It seems to be somehow nose heavy.. but so far it flies nice.. the video was recorded since i tought about adding the camera to the tail to see if that improved flight.. it flew as well.. maybe better... i think it can loss between 15 and 30g from the nose... or gain them on the tail.. the camera was 16g and it balanced it pretty well midway in the tail boom..





Also , probably its me, but it gave me the impression that it flew better than before in the past , even when just soaring with no power (as in the video where it only uses power to get out to the slope)
Posted by JLT_GTI | Jun 03, 2011 @ 09:20 AM | 5,199 Views
So i have this lovely good old 2 chanel glider sitting arround for more than a year by now:





its an Escuela from Modelhob (Spanish plane manufacturer) an almost 40 years old design quite popular arround as a first slope soarer.. its 2m wide and 2chan only, it weights arround 1200g , and has a Clark-Y airfoil, is meant to float and fly slow , and it does float nice arround...
Defects are , its quite slow with that profile, and it really doesnt like strong winds.. from 35km/h its grounded since at 25-30 its allready flying backwards, and adding weight is not much advisable since it has a nasty tendendy to break off the wings in strong lift/winds conditions..so its limited to 10-30km/h winds, under will not soar and over it will go backwards or risk structural damage.. Also being 2ch it has poor control in final aproach if you get caught in rotors or gusts

Since i allready got a slope soarer more fun , strong and better flying for windy days (Ninja) and other more fun and better flying for low-no wind days (CloudsFly) she was pretty much obsolete and not much usefull anymore.. so why not give her some use.. so i decide to power her up ..so it will be a 2m wide big plane for those no-wind days in the slope... a nice more classy alternative to the foamie CloudsFly (since the Escuela its an all wood old school plane)



...Continue Reading
Posted by JLT_GTI | Apr 27, 2011 @ 04:19 PM | 5,659 Views
Almost 2 weeks and i forgot to post the pics of the finished Ninja and of course the video of its maiden flight.


and here she is finally:



Here along another custom Ninja built from scratch based on the plans but with changes (reinforced overall, selig 6041 airfoil rather than E374 , slightly biger wing chord, bigger ailerons .. )



...Continue Reading
Posted by JLT_GTI | Apr 03, 2011 @ 07:21 PM | 6,813 Views
Curiously those were far easier than making the pushrods for the CloudsFly wich are made from far thinier wire with snap connectors..

Lookin for ideas i found a nice procedure of making snake-bend pushrods bends
here: http://www.flyrc.com/080851

As the Ninja has 4 threaded 1,5mm diameter wires..and since im using dual wing servos rather than a single servo i had 2 left.. so making the snake bend and cutting and they were ready... and the quick links from the kit make them easy to adjust afterwards if needed (unlike the snap conector ones wich require unscrewing a not so good quality screw)..

With this.. only "glueing" the servos in place and installing electronics is left apart from final covering.. wich will take more time to decide than make itself probably
Posted by JLT_GTI | Apr 03, 2011 @ 07:47 AM | 7,794 Views


Well.. not so..

Structural construction is complete.. "only" left installing electronics and covering