HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Oct 21, 2011, 07:19 AM
Registered User
how much's Avatar
United Kingdom, England, Wigan
Joined Jul 2011
756 Posts
Build Log
"WOT NEXT" a 34" span depron Aileron trainer/sport model

All

after trawling through nearly all the designs in the scratchbuilt foamies section i couldnt really find what i was looking for...

"what next?" after a sea BB or any other rudder/elevator/throttle trainer for the guys i am teaching to fly at the minute? so i threw this design together in an afternoon

its a 34" span 6mm depron 4 function model, very quick to build out of just one sheet of 6mm depron, and using the cheapest 1800kv brushless and 30a esc on a 1000ma 25 3cell lipo.. it flies way better than it should and has a very soft stall, it wont tip stall either, its a peach to fly.
the video is its 3rd flight over on a regular uk football pitch and needs no more room. its small enought to throw in my MX-5 sports car yet big enough to fly in a breeze without fuss. its a two piece model the wing is held on with 2 bands. and it pootles round on a wiff of throttle, the launch in the video was at half power







"WOT NEXT" a 34" span own design aeileron trainer/sport rc depron model (3 min 26 sec)



what do you think? is it worth me putting a set of drawings and a build log up?

David
how much is offline Find More Posts by how much
Reply With Quote
Sign up now
to remove ads between posts
Old Oct 21, 2011, 08:34 AM
Foam Av8r
RogueTitan's Avatar
In Teh Garage (Rossville, GA. USA)
Joined Sep 2008
3,351 Posts
Nice little plane!

I think so
RogueTitan is offline Find More Posts by RogueTitan
Reply With Quote
Old Oct 21, 2011, 09:30 AM
Registered User
United States, KY, Louisville
Joined Feb 2011
63 Posts
How does it fly?

I would like to see the plans, I love seeing how everyone builds their fuselages.
If you posted the plans I would build one.
MunkyMo is offline Find More Posts by MunkyMo
Reply With Quote
Old Oct 21, 2011, 11:24 AM
Registered User
Joined Aug 2011
2 Posts
Quote:
Originally Posted by how much View Post
is it worth me putting a set of drawings and a build log up?
Yup. This is just what I've been looking for.
pull2eject is offline Find More Posts by pull2eject
Reply With Quote
Old Oct 21, 2011, 12:55 PM
ExPat
Aero Andy's Avatar
Spain, Murcia, Mazarrón
Joined Apr 2010
1,600 Posts
David

Well "WOT" can I say, very nice indeed, I think you should post the plans so we can all have a go with a "WOT NEXT". Thanks for the video, she looks great and flies great.
Well done on a good build.
Andy
Aero Andy is offline Find More Posts by Aero Andy
RCG Plus Member
Latest blog entry: Phoenix 2000
Reply With Quote
Old Oct 21, 2011, 01:17 PM
Registered User
United Kingdom, England, Nottingham
Joined Sep 2011
4 Posts
Quote:
Originally Posted by how much View Post
is it worth me putting a set of drawings and a build log up?
I'm in
Jeekay56 is offline Find More Posts by Jeekay56
Reply With Quote
Old Oct 22, 2011, 04:23 AM
Registered User
how much's Avatar
United Kingdom, England, Wigan
Joined Jul 2011
756 Posts
OK then

five interested persons, looks like i will have to post some plans and build tips.
i will detail most of the build for people new to depron... sorry if you already know better!

Materials list

1 x sheet 6mm Depron (1000x700mm)
1 x 4ft length of 6mm dia dowel
1 x 1metre length 3x0.5mm carbon fibre strip
1 x piece 1/16 ply about 6" square
1 x piece 2"x 1/4 square wood for batterry hatch screw

adhesives.. tube of UHU POR contact adhesive, and some foam safe cyno

running gear...

3 x 9g servos
1 x 2208 1800kv brushless motor (should fly on quite a range of motors
1100-2200kv)
1 x 30a esc

3 cell lipo 1000-1200ma


Cutting list


1 x wing panel 34" x 8.1/8"
2 x fuselage sides 26" x 3"
1 x servo tray and fus formers 26" x 2"
1 x fuselage bottom 26" x 2.9/16"
1 x fuselage top 20" x 2.9/16"
1 x tailplane (incl elevator) 14" x 5.1/2"
1 x tail fin 6" x 4.3/4"
1 x rudder 7.3/8" x 3"

1 x 3" x 2" x 1/16"thk ply motor bulkhead


Plans

no need for fancy cad designs on this one, and as you can see from the cutting list its a very simple design to cut out. its basically cut 8 rectangles then trim each rectangle to make the part.
seriously... its that easy.. you dont need a computer or laser or anything else fancy! its "old skool" all you need is a steel rule, a knife and sanding block.. you will end up with a wot-next

if however you feel you cannot cut 8 rectangles from a piece of depron without the aid of a computer...
RCGroups user Potshot has drawn it up for you as a cad file here..

http://www.rcgroups.com/forums/showp...&postcount=128

thanks Potshot.



wing

wing

tailplane


fin/rudder


fuselage side

fuselage side... note! F2 is 5" from the front of the fuselage.. not 5" from F1





ok next we build the wing

David
how much is offline Find More Posts by how much
Last edited by how much; Oct 03, 2012 at 01:57 AM. Reason: link to cad file added
Reply With Quote
Old Oct 22, 2011, 05:42 AM
Registered User
how much's Avatar
United Kingdom, England, Wigan
Joined Jul 2011
756 Posts
Building the wing..

all photos are the underside of the wing..

mark out your 34" x 8.1/8" panel as below.. note the extra 1/8" width at the aft centre section so mark the centre line then the 3.1/2" wide centre.

trim 1/8" off the trailing edge of the ailerons, this is to allow for the rebating of the 1/4" dowel into the trailing edge.

just so you dont cut right throught the trailing edge...you may find it easier to cut the ailerons free from the wing then trim the 1/8" off the ailerons.. then butt them back into position into the wing to cut the radiuses at the tip.


mark the 1" radius on each edge of the aileron and strike a line forward to shape the tip, again another 1" radius to finish.
for the radius i marked and cut round a roll of solder that just happened to be 2" diameter. if you havent got anything then it will be worth cutting a disc of ply or similar to speed up marking out and cutting as the same radius is used throughout the build.


next cut the ailerons from the wing

cut a groove in the underside of the wing to accept the carbon spar 29" long
cut 3mm deep (not through) with a scalpel then using a piece o carbon spar re-cut the groove with the carbon to open it up.


then press the spar flush with the underside of the wing using the flat of a steel rule


once the spar is in, gently bend the gap around the spar open over the edge of the table and run a line of foam safe cyno along the spar and press flat onto the bench and zap with cyno accelerator

front spar.. a 29" length of 6mm dowel and short rear spar on te.. 3.1/2" of 6mm dowel
using a 1/4" round file runit along the edges of the leading edge to form a groove for the dowel



glue the dowels with por contact adhesive, put glue on the wing edge and the dowel then leave them to dry for 15minutes
place the wing on a flat surface before pressing the dowel spars onto the wing so as not to induce any curve to the wing


Ailerons
sand the hinge edge of each aileron at about 45degrees using a sanding block. leave a vertical flat edge of just over a 1/16" (2mm)



apply a narrow bead of por adhesive to the 2mm edge of the aileron and to the upper edge of the aileron cutout (the V shaped bevel edge of the ailerons is on the underside of the wing) and leave to dry for 20 minutes


place the wing on the flat surface, use a scrap of 1/16 ply as a spacer, place the ailerons flat on the table and bring together (correct way up)


leave to dry for a couple of hours before waggling them up and down

next cut the hole for your aileron servo and glue a couple of scraps of 1/16" ply on for the servo screws..


a quick sand round the edges, taper the leading edge dowels down to nothing at the tip..



wing done


the same methods are used for fitting the carbon spar in the tail and for hinging the elevator and rudder

David
how much is offline Find More Posts by how much
Last edited by how much; Dec 20, 2011 at 02:10 PM. Reason: extra instruction added as a result of p.m.
Reply With Quote
Old Oct 22, 2011, 06:00 AM
Registered User
how much's Avatar
United Kingdom, England, Wigan
Joined Jul 2011
756 Posts
Tailplane, Fin, and Rudder

ok
the tailplane, same construction as the wing but without the 1/4" dowel


the 3 x 0.5mm carbon spar is the 10" you cut off the wing spar (providing you bought a 1metre/39" length) insert on underside of tail as per wing

cut the elevator off, leave it full width, do not cut the v out of the middle yet, as this will help keep everything straight.
sand the bevel edge and glue the hinge line as per the wing using por



now add the 5.1/2" x 3/8" 1/16" ply stiffener to the elevator using por


now cut the v out of the back of the elevator when its assembled


tailplane done!

cut out the fin and rudder so they are ready for fitting



right i have got to go and make the fuselage...

back in a bit


David
how much is offline Find More Posts by how much
Reply With Quote
Old Oct 22, 2011, 06:08 AM
Registered User
how much's Avatar
United Kingdom, England, Wigan
Joined Jul 2011
756 Posts
wow! writing that lot up took me longer than it did to make the wing/tail and fin

hope i have put enough but not too much information on the blog?

David
how much is offline Find More Posts by how much
Reply With Quote
Old Oct 22, 2011, 06:19 AM
TonyS
United States, AR
Joined May 2010
595 Posts
David,

You offer an interesting plane. Thanks for sharing it and your excellent plans-via-build log!

TonyS
tonystro is online now Find More Posts by tonystro
Reply With Quote
Old Oct 22, 2011, 09:20 AM
AKA Don
bz1mcr's Avatar
United States, MI, Houghton Lake
Joined Dec 2002
7,542 Posts
Veyr nice! Another 1 sheet'r.
Thanks for sharing it.
Don
bz1mcr is offline Find More Posts by bz1mcr
Reply With Quote
Old Oct 22, 2011, 12:43 PM
Registered User
how much's Avatar
United Kingdom, England, Wigan
Joined Jul 2011
756 Posts
Building the Fuselage

ok
on with the fuselage.....

the main consideration with the fuse is getting everything straight and true without any twists etc. so use centre-lines to get everything even and use a small engineers square to get everything at right angles to the top line of the fuse. the wing and tail incidence are zero degrees so is the thrust line of the motor... so use a square to get it right.

the drawings (edit note: F2 is 5" from the front of the fuselage... not 5" from F1 )




cut out the fuselage sides and mark out the position of the formers and servo tray


cut the formers and servo tray from the length of 2" wide depron


build up F1 with its 1/16" motor mounting plate, note the air cooling hole. and the 2"long piece of 1/4" square wood along the bottom.
EDIT.. make the cooling inlet hole smaller than shown, say 1"w x 3/4" high.. just so your lipo doesnt try to escape!


mark out the centre line of the motor its 3/4" from the top edge, and its best to drill the bulkhead ready to accept the motor before assembly



mark out the position of the servos on the tray



and build up the tray and formers nice and square


and fit to one side of the fuse


install F2 either side of the servo tray


if your battery is slightly longer than the 1000ma i am using.. move the lower half of F2 back to accomodate the bigger battery


install the 1" square doublers in the position shown, this strengthens the location of the wing fixing dowel in the fuse side

and


then the 3/4" deep doublers that reinforce the battery tray



sand a bevel on the inside face of the rear joint of the fuelage at the tail


glue the two halves together with the fuse resting on its top edge

then join the rear lining up all the centre lines so its even. draw the profile onto the top and bottom fuselage faces



glue the tailplane on


temporarily fit the upper rear deck and drop the wing in place, this will allow you to cut the forward upper deck to the finished length and fit



mark the position of the wing fixing dowels and carefully make holes with a screw driver for the dowels


cut the cooling holes in the fuse sides of the battery box using a bit of brass tube, note the esc is fitted in the battery tray as well


fuselage lower cover is 22" long from the rear of the fuse and extends forward of F2, it can now be fitted


make the hatch for the battery box as shown



its now time to fit the servos and pushrods etc before the upper rear deck is fitted




then fit upper rear deck and fin.. rudder is hinged as per aileron using por



a final sanding to smooth things up and its ready to apply some trim



and that is about the size of it!

centre of gravity is 1/3 wing chord from Leading edge and mine is fine with its 1000ma pack.

control throws.. lets assume you have installed the servos with "maximum throws" as shown in the photos with the pushrods at the ends of the servo horns... be warned... this is for experienced pilots only and the control response is very very quick.
for novice pilots considering this as a first aileron model use the dual rates on your transmitter...
start off with 60% throws on Aileron and Elevator, and 40% throw on rudder... it will transform the model into a very stable and easy to fly plane.
for most hand launch take offs... half power is usually enough to get it airborne (depending on motor)

wouldnt be difficult to fit a simple wire undercart with some lightweight wheels..

or how about a set of floats? now theres a thing

who will be first to build a "WOT NEXT" ???
how much is offline Find More Posts by how much
Last edited by how much; Oct 03, 2012 at 02:06 AM. Reason: note about control throws added
Reply With Quote
Old Oct 22, 2011, 01:05 PM
ExPat
Aero Andy's Avatar
Spain, Murcia, Mazarrón
Joined Apr 2010
1,600 Posts
Thanks David, the build log is fantastic
Andy
Aero Andy is offline Find More Posts by Aero Andy
RCG Plus Member
Latest blog entry: Phoenix 2000
Reply With Quote
Old Oct 22, 2011, 01:21 PM
Registered User
Joined Aug 2011
2 Posts
Wow! Great job with the write up. Thanks.
pull2eject is offline Find More Posts by pull2eject
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Wanted Wot Trainer St3v3 Aircraft - Fuel - Airplanes (FS/W) 0 Sep 29, 2011 08:06 AM
Discussion Trainer with aileron depron plan please... luconedj Beginner Training Area (Aircraft-Electric) 1 Apr 27, 2010 02:47 PM
Discussion Next model after aileron trainer? norite Beginner Training Area (Aircraft-Electric) 10 Jun 28, 2006 02:53 PM
Help! Next plane?....Need aileron trainer--- TurkeyTx Parkflyers 8 Feb 15, 2006 10:40 PM
Dandy Sport - aileron Trainer CoClimber Parkflyers 143 Apr 16, 2003 07:34 PM