A-10 JePe FastFoam Build Instructions

544Welcome to my build log of the new JePe FastFoam A-10 which is an extreme makeover of the LX-A10 kit with many JePe improvements in construction / Fan units / Retracts and Aerodynamics. With all respect to the original painted RTF-version this Jets now has become a high performance JePe FastFoam Jet. When 2 companies have spend so much time in this ‘2-stage design project’ than you can expect a very special kit.

Now on stock and ready to ship!

big model with about 3kg weight and 154cm wingspan ! 667Flaps and sharp balsawood trailing edges691

many JePe cnc plywood and epoxy construction parts are added to the kitSAM_4514

strong retracts mounting with Epoxy parts to reinforce the mechanics052

2 new JePe JET70-6s 7-blade! provide the Puch needed for a 3 kg FastFoam Jet70mm 1

scale detail still good visible after glassing with PU-EPS and 25 gramm glass tisseu. (Picture is of glassed wing that has even had a second coat of PU: ready for paint job!)  Because this model is so complex I advise to use only PU-EPS finish(not endless Epoxy mixing all the time..). PU-EPS Finish will save you really much time and weight on all these parts.694Kit with Pilot /decals/ rockets/bombs all in white EPS foam which is perfect for glassing! SAM_3456Modifications are already done in the JePe Atelier for you: below you see lowered angle of attack for mainwing (less drag / better inverted flight/ better speed)SAM_3968foam already removed by JePe so your wing will fit easy to new lifting angleSAM_3951

  the non scale “box shape” wheel fairings will be reduced for the 4 kg landing gear version by JePe into more scale wheel fairings were half wheels stick out (just like the real one). Also larger scale size wheels of 70mm are now possible(good for improved grass runway take-off). If you order the standard plastic LX landing gear with this kit than I will leave it like it is so original landing gear will fit the wheel bays.SAM_4038

A-10 material List of parts needed to finish a Jet like this:

  • PU-EPS glassing material with 3,3 m2  25 gr Glass
  • 6x digital metalgear mini 14gr Corona DS-929MG servo
  • 2x micro 6 gr servo (rudders)
  • 1x analog metalgear servo 14 gr Corona 929MG analog (nosegear steering)
  • 2x30cm servo extension leads for  flaps
  • 2x30cm servo extensions for the main retracts
  • 2x45cm servo extension leads ailerons
  • 2x Y-Cable 30cm for elevators and rudders
  • 2x 30cm servo extension leads for elevator and rudder function
  • 3x Suspension Leg ‘Off-set’ version 108mm long
  • 2x 70mm and 1x60mm light Foam Wheels drilled for 4mm shaft
  • 4kg version stronger retract mechanic set (best change the standard plastic LX retracts for a set of JePe cnc strong mounting plates to hold the stronger 4kg retract system)
  • 1x JePe A-10 retract mounting plate set for 4 kg mechanics (you can switch these for the LX Plastic retracts)
  • 2x70mm JePe Jet70-6s 7-blade (can run on just 5s pack(s)) or light outrunner Fans
  • 2x80Amp cotroller (2x YEP-80 Amps 6s on my prototype)


Let’s start with building!    Fuselage:

Glue all extra cnc 4mm Plywood parts into place, best with PU-Glue (use some needles and scotchtape)SAM_3696part most on left is thicker 5mm balsawood SAM_3698some parts are doubled because of hight differences in FoamSAM_3704

Time to Glue both rear fuselage half together with only little PU-Glue and tape it together with some Scotchtape and needles for best possible join. Do NOT glue nose section to fuselage yet!(comes later)SAM_3713

the wing lift angle correction made from 4 cnc balsa formers (each 5mm thick)SAM_3930 there are 4 of these cnc corrections (2 glued next to each other)SAM_3938Glue this plywood front bulhead into place and than mark the holes onto your wingpanel (I used a drill to mark the positions of holes)SAM_3753drill 2 holes in wing and glue the 2 pins in place with some fast Epoxy , put wing in positions during hardening so the pins line-up with the holes in the plywood bulkhead (I used some PU later on to fill the holes around the pins a little but not do this as wing is still in position: the PU will expand and you can not remove your wing anymore..shit!)SAM_3760Next step is to bring the plywood battery extension tray into place with PU-Glue and glue also the nose onSAM_3727from below you see other end of the battery tray glued strong to the bulkhead that will hold the 2 carbon wing pinsSAM_3730


Wing Bolts:

take out the rear plastic wing bolts holdersSAM_3779use your sander to shorten the topsideSAM_3794Use your dremel tool to fit the holes for the bigger Plywood washers and use some Epoxy to push the parts back in place. 2 longer M3x60mm Bolts are in the extra parts kit (these longer bolts make it easier to put your model together on the flying field)SAM_3799

building the main Wing:

first we need a cutting line to remove some foamSAM_3641at wingtip you must cut-off full 15mm (like the balsawood 15mm trailing edge)SAM_3640at middle were the 2 wingpanels meet it is only half of this 15mm (half of balsa trailing edge)SAM_3658use some help to make the cut under 90 degree of the centre line of wingprofileSAM_3650

you can see: more foam removed at wingtip than from middle of wingSAM_3642again some Scotch tape and needles to keep things in place (keep nice in line with centreline of wing profile)SAM_3644trimming the middle panel: cut again half from the 15mm wide trailing edgeSAM_3653SAM_3661afterwards you can do sanding with a block and some 150 grain sanding paper SAM_3735some Easy-Foam Filler and a blade of a knife to make it perfect smoothSAM_3740now we cut the wheel fairing complete off !! use a fresh blade SAM_3808don’t be so shocked: “its only a TOY “SAM_3809

Joining the wing panels:

first you do light sanding of the contact surface between the wing panels so your glue can do good bonding. Use some Scotchtape annd needles to keep the wingpanel in position. Inside is a alluminium tube connection from the standard kit: check this tube on right angle (6cm from picture further below). You can sand the tubes from the outside and glue them with some PU-GlueSAM_3860

than you level out the main wing panel on a table, use same hight of spacers under the wing so it is 100% level with the table.SAM_3854

    both Wingtips must rise 6cm (scale!) no not Inches!SAM_3858  let it rest like thisSAM_3869Next day you can put in the Epoxy Rudderhorns that are drilled for 1,7mm  these fit perfect for Kwiklink steering (use Epoxy to glue these in place)SAM_3912

main Landing gear Plywood mounting for optional 4 kg retracts:

this is optional JePe cnc 4kg mounting set. You can swap this complete parts set in our shop for the standard plastic LX landing gear (no extra charge / no discount)1044

clear this pocket so the plywood part fits in niceSAM_3837

 use Dremel to deepen the pocket. Go deeper untill you hit the aluminium tubingSAM_3840than you make 2 sleeves so you can put in the 11cm long carbon strips. These 2 strips will make a strong bridge over the weaker retract openingSAM_3883the strips must be just under the plywood part so it can rest and glued to themSAM_3897on top come the other 2 Plywood parts, use epoxy or PU-Glue to put it all together and make good contact with the foam. Also you can stick a steelwire in the holes to keep them inline(pull wire out before it starts to harden!). Also keep holes clean because I already drilled M3 thread in for you (put a little tape on the M3-nut)SAM_392210511073once epoxy has hardened you can drill 4mm holes under an angle, drill deep! into the foamSAM_4142fill holes with Epoxy glue and drive in the 4mm carbon pinsSAM_4144the 4 pins glued under an angle will be good anchors deep into the foamSAM_4151use a raw file or 80 grain sanding paper to deepen the large 70mm Wheel baySAM_4033note my cutter: you need one as real FastFoamer!SAM_4030wheel fairing in place with some PU-GlueSAM_4159difficult to find some scale pictures but the fairings look a little like this:SAM_4219use some 120-150 sanding paper and a block to round the wheel fairings, find pictures of full scale version to give them a nice shapeSAM_4221

Suspension Legs:

Main Gear: use 2 x 108mm suspension leg with off-set and large 70mm wheels(the strong&light Foam wheels from my shop fit and have also 4mm shaft hole). The suspension legs need to be modified a little so they move absolute free from the mechanic. Use a flat File to take some material off and check if you can see ‘light’ between the leg and the mechanic (when it is in up position)SAM_3824

 my 4 kg mechanic versions come with 5mm hardened steel connection pin but you must cut 5mm off (sorry just a little too long..)SAM_4005wing of the A-10 is already heavy (many servo’s / cables / retracts..) so I changed the metal trunnion and used the much lighter Nylon version (you save 45 gram! on 3 of these) For model upto 3,2 kg these nylon version work just fine: no problem!SAM_4010you must see ‘the light’ between leg and mechanic (it should not block for reliable use)SAM_4015

Carbon Roving Spar:

deepen the servo leads canals so all the servo wires do fit in easy and tere is some room left on top of the wires. Do not forget to put an extra pair of wire for the retract mechanics!237Here you see my succesfull experiment: I simply use PU-Glue to impregnate the carbon rovings (nice wet). Than I put a layer of wet EasyFoamFiller over my servo leads: just enough to cover the wire up.236Put the wet Carbon Rovings over the servo leads and let it rest for 15-25 minutes 242I put in double rovings in the middle part of wing and 1 roving on outboard servo canals240Than when it is still very sticky you must finish it off with some more EasyFoamFiller.     249If you do the Foam filler on top you must watch every 10-15 minutes for Gas bubbles (the water from the EasyFoamFiller works as activator for the PU-Glue). It is very easy to push out the gas but you must check a couple of times during the first hour of hardening

Back to the Fuselage:

make the plywood sideskirts nice sharp with some sanding block.SAM_4376

bring the parts in position (check with wing) and glue with PU127

clean up the hole (original Depron Skirts a way too big)138

you have to remove some foam from the wing so it fits between the skirts226

use some Scotchtape to protect the foam from sandingpaper, use some easyFoamFiller here to make surface back nice smooth227

than there is an extra Cockpit lock that fits nice flush with nose radius (original has magnets but you do not want that for your FastFoam project). I am also not going to use (or is it: going to risk?) the servo canopy opening system, besides that I do not have enough chanels to use this gadget.SAM_3874

The nose gear:

this is optional 4kg nose gear plywood mountingset (comes together with the maingear mounting plates)052

Take some foam out on the right side so you can get in the plywood parts.001

the 7-layer bottom plate is not symmetrical so you must check position of Mechanic holes before you glue! 004

than you can glue back the foam part on the side005  plenty of room to sink your steering servo in front of the mechanic into the foam (best use an analog metalgear servo for steering)076

Nose Gear: use an off-set 108mm long suspension leg with large 60mm light Foam wheel for the nose gear


cut 7mm foam off from elevatorsSAM_3666same job as on the main wingSAM_3668vertical tail panels at 90 degreeSAM_3744use smaller servo’s for the thin rudder panels: 6 gramms on my A-10. The steering is from innerside of the vertical fins. You can use same servo’s(servo’s run in same direction) and connect over a Y-Cable to only 1 channel of your receiverSAM_3746NOTE: the elevator servo’s are now heading in same direction so you can use same type servo’s and still connect with Y-cable to 1 chanal of your receiver. (original has 1 reversed servo used but I do not have these so just flip one servo over)SAM_4715I used 2 extension cables just to pull the Y-cables back into the tail end. Than disconnect the long extensions and plug the Y-cable to your servo’s. From receiver to the start of Y-cables you will need a 30cm extension cable (1 for rudder and 1 for elevator)SAM_4712

cut small sleeves forEpoxy rudderhorns with your Dremel and glue them into position with Epoxy. The Epoxy horns must be 100% same lenght (look close at the rudderhorns and you will see I made an easy shape to get them at same height). If you have 2 different lenghts in the rudder horns it could be very well possible that your model will start to roll in a looping…and you do not want that!SAM_4726

cover the servo leads up with EasyFoamFillerSAM_4733there is often some expanded foam glue coming out on difficult locations: use dremel to cut it out and than use a fingertip with EasyFoamFiller to fill the sharp join so you have a small radius of FoamFiller (this is also good for easy glassing later)

Jet Fairing:

I used 2 scratch pieces of 7-layer plywood and glued them together with the bottomside of the Jet-fairing (bottomside of the fairing is already glued to fuselage)SAM_4680

use the 2 plywood washers and glue them behind and 1 in front of the vetilation scoop (sink them with your Dremel). SAM_4739

Than drill 2-2,3mm hole and put M3 thread right through it (or use just screws..)SAM_4740

on outside of the Fairing I use the original connection parts (just did glue them to one side so I can not lose parts)SAM_4708


First and only re-shaping of this model:

the original kit fairing has sadly the shape of a biscuit Tin..but easy to give more scale look! lets start with the airscoop: this should be more narrow:SAM_4668

like this after cutting with sharp knife blade and some sandingSAM_4669

than I see here another ugly straight section that is not scale:SAM_4704

After some sanding it should be curved: (also It made the rear exhaust flat and will paint this flat surface black later)SAM_4707

here below we have the “Biscuit Tin” view. The front section of the Fan housing is to long straight and should start to curve much earlierSAM_4671

you must work on first 5cm around the airintake, just sand it sharper and even a big flat around the sidesSAM_4670

same for last 7cm of the fairing: make almost it a little Flat ! all aroundSAM_4711


time for Glassing!!

first we have to prepare the model and cut all rudders off!   Don’t cry: we are going to replace them later by real FastFoam Hinges!

first check with a fingertip of EasyFoamFiller for sharp corners and fill them with small radius of filler. You will find them around the vertiacal fins, stabilazer to fuselage join and whell fairings (below)045 cut the trailing edges most easy with a lose blade from your steelsawSAM_4810

Cut all plastic hingesSAM_4813

  pull the them all out just like your dentist would do..SAM_4819before you can start glassing it is needed to sand complete model with 150 or even 180 sanding paper . Fold the paper double and sand with flat hand, after that you clean the model from dust.

now you can put on a sheet of 25 gramm glass and start painting over the glass with PU-EPS Finish ( I have made a headcam movie of glassing this wing that I will put online)SAM_4829push the thin glass also into the rocket fairing sleeves SAM_4830

cut it in at corners (like you do with oracover)SAM_4833

take it around the corners with your brush (all go’s very easy and quick with PU-EPS Finish and 25 gr glass)SAM_4836

do not spend much time on problems were to much glass foldes together: it is gone with a little sanding paper before you know(but let it dry first!)SAM_4844

do not spend time on balsa trailing edges: just let it hang over the edge (sand it off when dry)SAM_4847

    splitup the glassing sections when object is difficult. Because of wheel fairing I used 4 parts to cover the bottom wing sideSAM_4850cut it in with sharp scissorsSAM_4852now I make  one side of the rocket fairings wet with PU-Finish and bring them on the still wet fresh glassed wing. Push it in the pockets and use needles to keep them in position. the PU- will act like glue. Note: do this when underside of glassed wing is still wet and select all 6 fairings because they have all diffent size but also left- and rightwing angle! (best give them numbers before you start) SAM_4854   Next day you can sand the topside so you feel no start and finish af you glassing work from evening before. Useing PU-EPS Finish makes sanding very easy (much easier than Epoxy!) . Use dust mask if you do glass sanding (with all sanding but specially with glassfibre)

below you see how easy the 25 gramm glass is pulled around sharp edges: use only 25 gramm glass for light and easy workSAM_4868another example of 25 gr glass   SAM_4886next day I put a stripe of glass on top of the rocket fairing and pulled over the sides down on the wing. you can fold it around the front and leave it drying at the sharp rear SAM_4894

Putting Back the Rudders and Flaps:

make cut with fresh blade640

 press some glue in the cut (use knife blade and your finger to push some PU-Glue in)648yes: just PU-Glue on the hinges! this works very good!656

 push them in and clean what is sticking out. let it harden an hour before you are mounting to the other side650  after an hour you put some PU on (also in the other cut of wing panel). When rudder is pushed to position it is needed to wipe the excessive glue away with a folded piece of toilet paper 662


By this time your model should look like this, if not you must buy some reading glasses! (like me..) this twin 70mm jet is as big(or bigger) as many 90mm Jets686The fantastic new JePe JET70-6s 7-Blade will provide super power(also on only 5s) Current on 5s is only about 55Amp (max60) so you could use one big 5s 5500-6000mAh battery or 2 smaller 3300 30c packs. I have tested these new very dynamic Fans on only 5s in my big F-18 of 3,2 kg with 2 old 4500mAh/5s packs on board: plenty! of power even for a fighterjet like the F-18 (have a look in my shop at the JePe JET70-6s 7-Blade)

Like my old fiberglass A-10 it is possible that I need a little trustline correction to balance the high positioned Fans. If I need extra parts to tune this model than these will be shipped for free (the Fans are already tested and I will testfly the A-10 also soon: its sitting here with all servo’s ready installed…a matter of days now)