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SFS 31 Milan

Fans and Thermals.
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Noël Rumers
Posts: 261
Joined: 20 Mar 2015, 10:29
Location: Hoboken Antwerp

Re: SFS 31 Milan

Post by Noël Rumers » 17 Oct 2015, 15:30

Hi guys,

the 1/4 scale one looks great to me but a bit small.
I like them a bit bigger, they fly better and the best part, they soar much better too.
At this very moment I have the 1/3 scaled drawing ready. This needs a few changes due to minor mistakes that got into designed parts.
I almost know all that needs to be changed. All will be altered as soon as the last bits are glued onto the fuselage.

The Milan was based on the RF4 fuselage, "BUT"...it isn't the same, specially on the wing joiner area.
All was measured by the owner of the G-KORE for me and with the help of a lot of good pictures the RF4 design was altered to make it into the SFS 31 Milan.
I will have the drawings ready very soon, scan them into PDF and make them available for free.
The wing was tested twice yet. One time on a 1/3 not to scale fuselage, by my good friend and once on a 1/2.5 scaled altered RF4 from German ARF kit.
Due to being an over 20 kg model for the last one, all was tested due to regulations with help of the LMA.
MW in July I was able to see it the first time fly and was happy to soar together with Bob's very nice make over.
The original airfoils are used for his and our design. The same airfoil as on my SF27 B M on building thread in this site.
More on the Milan wing, elevator and rudder will follow very soon now, so just see what comes next... ;)
I will do a cowl and canopy for it with the possibility to reproduce them. Have bought the Mick Reeves 1/3 scaled cowl and canopy, but due to a cowling change and higher canopy, no good...
If someone want these to build the M.R. RF4...available for half price.

See the cowl of the D-KORE before and after the change...and the RF4...
See also the difference on the canopy and the turtle back behind it, the first two formers are lifted a bit...
See also the bottom on the RF4, the spruce skids, on the RF4 they are straight, on the Milan they have a very good curve and they are lowered in the centre as wide as the retract bay...On the RF4, the wing is in one piece, the Milan has two parts, one LH and one RH, joined like glider wings to the fuselage. Our model will have four parts for easy transport with a removable rudder and elevator too.
More on these differences later on.
Noël
Attachments
1472873.jpg
D-KORE 2.jpg
D-KORE 7.jpg
Blanik_L13_054_Model_builder_1981.jpg
DSCF7663.JPG
0870001parts milling.JPG
DSCF7675.JPG

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Noël Rumers
Posts: 261
Joined: 20 Mar 2015, 10:29
Location: Hoboken Antwerp

Re: SFS 31 Milan

Post by Noël Rumers » 19 Oct 2015, 14:13

The servo and fuel tank trays are in now.
The tray of the fuel tank must be cut to length later on when I know where the instrument panel will go.
Both servos for throttle and starter/choke are installed and a 3 mm push rod tube is glued in to guide the cables that will be connected between the carburetor and these servos.
The cables are on the carburetor and cut off long enough so that later on, when all is finished and the engine can stay on, these two cables can be connect on the servos to the required lengths.
I always use these cables, in fact fishing lines, cheaper than you get them in a model shop sometimes, to connect the carburetor with the servos, this way no or less stress comes to these servo... ;). See also how the servo for the starter/choke works.
To connect the line on, both the carburetor and servo wheels or arms, the same few bits are used.
Two cut rings of fuel tube, an 6 mm long push rod guiding tube, a bold, nut and washer, M2 and "NO" glue. The small rings slip over the tube and press them either end so the cable will fit in between. Easy not? You need of both the choke and throttle a spring on your carburetor...see before...
At last you need a 3 pos. switch on the TX. One end is the big wheel with connecting shaft, is place so that is not pulling anything. Mid pos. the starter will go due to, see the small white angled disk, it presses the contact switch to run the starter.
If the engine has been standing, e.g. one week or longer, there is no fuel in the carburetor. You need a finger in the carburetor and turn, some do that...to get fuel up front. With the starter, you do it otherwise. Now you open up your throttle first, fully!!! The other end of the 3 pos. switch will turn the wheel even more, so the cable will pull the choke valve fully closed, while the starter still is running, see the disk still pressing the switch.
The moment the engine wants to go, if you are fast enough, closing the throttle and switching at the same time the 3 pos. switch to its zero position, the engine will run. If not just restart and running!!!
The trim of the throttle is for starting always so far open that the engine will run on the low RPM setting, so the model stands, and for safety I put my leg(s) in front of the elevator.
The tail wheel shaft is also drilled and mounted on now...
Now the servo motor to control the main gear will be installed.

Noël
Attachments
2015 10 180001throttle and choke control.JPG
2015 10 180002throttle and choke control.JPG
2015 10 180003throttle and choke control.JPG
2015 10 180004throttle and choke control.JPG
2015 10 180005throttle and choke control.JPG
2015 10 180006throttle and choke control.JPG
2015 10 180007throttle and choke control.JPG
2015 10 180014throttle and choke control.JPG
2015 10 180015throttle and choke control.JPG

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Noël Rumers
Posts: 261
Joined: 20 Mar 2015, 10:29
Location: Hoboken Antwerp

Re: SFS 31 Milan

Post by Noël Rumers » 19 Oct 2015, 14:15

...more pictures...
Attachments
2015 10 180010throttle and choke control.JPG
2015 10 180011throttle and choke control.JPG
2015 10 180012throttle and choke control.JPG
2015 10 180013throttle and choke control.JPG
2015 10 180016throttle and choke control.JPG
2015 10 180017throttle and choke control.JPG
2015 10 180018throttle and choke control.JPG
2015 10 180001Milan tailwheel.JPG
2015 10 180003Milan tailwheel.JPG
2015 10 180004Milan tailwheel.JPG

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Noël Rumers
Posts: 261
Joined: 20 Mar 2015, 10:29
Location: Hoboken Antwerp

Re: SFS 31 Milan

Post by Noël Rumers » 20 Oct 2015, 22:17

2015 10 200005Retract servo installation.JPG
Today the retract servo from Mick Reeves was installed under the pilot seat.
Due to the forces that come on the arm, pulling and pushing, all was made a bit stronger.
A M4 threaded rod was used with the good connectors and as a bonus a steel tube will prevent any bending of the rod.
A 6 mm ply base plate was cut to fit the seat and landing gear box.
Test running was done several times without any problem.
Noël
Attachments
2015 10 200001Retract servo installation.JPG
2015 10 200002Retract servo installation.JPG
2015 10 200003Retract servo installation.JPG
2015 10 200006Retract servo installation.JPG
2015 10 200007Retract servo installation.JPG
2015 10 200008Retract servo installation.JPG
2015 10 200009Retract servo installation.JPG
2015 10 200010Retract servo installation.JPG

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Noël Rumers
Posts: 261
Joined: 20 Mar 2015, 10:29
Location: Hoboken Antwerp

Re: SFS 31 Milan

Post by Noël Rumers » 23 Oct 2015, 00:09

Today the servo gear box was opened to see why some play was on the disk that controlled the arm to the retract wheel.
I remember that on the K16 I had to Ag weld the outgoing gear wheel to the outgoing shaft.
This I have done again, so it will go without slipping over the knurled shaft...
After cleaning, greasing and putting it back together, it looked better when pulling in and out. Due to the big force needed an elastic from TC was installed so the wheel is hanging half way now, without the control arm connected. This way the sound the gear box makes is much nicer...no stress noise...
The small control servo with two switches for the retract servo was fitted too as well as the rudder servo.
The power box will be for later on.
Now the construction of the fuselage can be finished, finally!!!

Noël
Attachments
2015 10 200011Retract servo installation.JPG
2015 10 200014Retract servo installation.JPG
2015 10 200015Retract servo installation.JPG
2015 10 200016Retract servo installation.JPG
2015 10 200019Retract servo installation.JPG
2015 10 200020Retract servo installation.JPG
2015 10 200023Retract servo installation.JPG
2015 10 200024Retract servo installation.JPG
2015 10 200026Retract servo installation.JPG
2015 10 200027Retract servo installation.JPG

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Barry_Cole
Posts: 1267
Joined: 10 Mar 2015, 09:30
Location: Hampshire UK

Re: SFS 31 Milan

Post by Barry_Cole » 23 Oct 2015, 07:54

Blimey Noel, A retract servo from the Arc ???????????????

:lol: :lol: :lol: :lol:

BC

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Noël Rumers
Posts: 261
Joined: 20 Mar 2015, 10:29
Location: Hoboken Antwerp

Re: SFS 31 Milan

Post by Noël Rumers » 25 Oct 2015, 22:18

...the servo later... ;)
The finishing of the fuselage started now.
First the rear top and bottom part needed extra reinforcements. I have build in triangles to make it more stronger.
The rood rib needed to get a straight strip on so the gap to the fuselage could be filled. The spruce strip will be removed later when all is glued on.
The wheel bay doors have a kind of special hinges. These needed extra wood by gluing in 6x4 mm spruce parts.
Also to get to the retractable gear lower bolds, I decided to make a hatch at the bottom.
To be able to fit this in, one needs also hard wood strips glued in.
The bay behind the wing rood rib TE was filled with balsa block, sanded to shape and it looks OK for now.
Noël
Attachments
2015 10 200003Retract servo installation.JPG
2015 10 200006Retract servo installation.JPG
2015 10 200007Retract servo installation.JPG
2015 10 200008Retract servo installation.JPG
2015 10 200009Retract servo installation.JPG
2015 10 200010Retract servo installation.JPG
2015 10 200013Retract servo installation.JPG
2015 10 200015Retract servo installation.JPG
2015 10 200016Retract servo installation.JPG
2015 10 200018Retract servo installation.JPG

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Noël Rumers
Posts: 261
Joined: 20 Mar 2015, 10:29
Location: Hoboken Antwerp

Re: SFS 31 Milan

Post by Noël Rumers » 25 Oct 2015, 22:21

...and more...
Attachments
2015 10 200020Retract servo installation.JPG
2015 10 200022Retract servo installation.JPG
2015 10 200023Retract servo installation.JPG
2015 10 200025Retract servo installation.JPG
2015 10 200026Retract servo installation.JPG

Ken Sampson
Posts: 1
Joined: 17 Mar 2015, 23:33

Re: SFS 31 Milan

Post by Ken Sampson » 05 Nov 2015, 08:48

A u/c servo having 80psi force! Can't be many that could equal that...

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Noël Rumers
Posts: 261
Joined: 20 Mar 2015, 10:29
Location: Hoboken Antwerp

Re: SFS 31 Milan

Post by Noël Rumers » 13 Nov 2015, 23:40

Hi all,
Ken, indeed this is a very powerful servo. The mechanical way of controlling it is simple with 4 switches. It is also small to build in. See the MR site for more info.
Due to more important works that had to be taken care of first, the Milan was still close but untouched...
The gardens, new henhouse roof and a few other works are finished now, just a lot of leaves...container by container will be filled, but these will be solved in due time.
Back to the Milan at last!!!
The bottom of the fuselage is taken care of now. A 10 mm balsa block cut to shape was glued in to have a wider edge to glue the bottom sheeting panel onto.
My thinking was that this way when lifting and carrying the fuselage around, the ply would hold more firmly to the first former.
This would more or less be the point to put your hand for lifting under the fuselage...
Noël
Attachments
2015 11 110001sheeting reinforcement.JPG
2015 11 110002sheeting reinforcement.JPG
2015 11 110003sheeting reinforcement.JPG
2015 11 130001sheeting reinforcement.JPG
2015 11 130002sheeting reinforcement.JPG
2015 11 130003sheeting reinforcement.JPG
2015 11 130004sheeting reinforcement.JPG
2015 11 130005sheeting reinforcement.JPG

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