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Jul 14, 2013, 09:48 PM
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Quote:
Originally Posted by losthorizonmba
@KinTX, You're right, far too aft for LG and Klaus Neitzer's plans make no provision for LG. I'm just going to skip over the trapdoor. BTW, HobbyKing has come out with a bARF Storch.

Well, fuselage is upright for the first time. RFD900 radio modem (900 MHz) for telemetry will be installed on top of fuselage behind wings so heatsink will be exposed to slipstream.

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Work on wings will commence one I receive aramid kevlar tow and the new generation ultra nano servos and wing mount hardware from Akhibara, Japan. One each for spoilers perhaps two per flaperon since I'm avoiding the bell-crank option.
Maxford USA has one also, and the wings fold (hopefully not in flight!):

http://www.maxfordusa.com/fieselerfi-156cstorch.aspx
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Jul 14, 2013, 10:14 PM
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Fuselage: short tail moment


Progress thus far on fuselage. Short tail moment.
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WRT short tail moment, will be installing rudder and elevator ultra nano servos in the tail.

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Since this baby will be carrying a comprehensive FPV avionics suite, I have to forego magnets for canopy locks.
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Jul 15, 2013, 05:08 AM
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Ventral Trapdoor


Many thanks to Erik (Ka-6BR) WRT the ventral trapdoor which puzzled me "holds a drogue chute that attaches to the tail skid strut. There is a spring on it, and the latch is operated by a control cable from a servo as near as I can read from the plan."
Thanks Erik for the information. He adds: "the camouflage scheme... is inaccurate in most model kits and aircraft paintings.

"The DFS gliders that assaulted Fort Eben Emael and the three bridges in 1940 were light gray with side insignia painted out with a slightly darker gray.

"The swastika on the V-stab and crosses on the wings were not added until late in the war, as a glider was not considered an aircraft until then. I have found nothing on the squadron code letters & number codes on the fuselage sides.

"The late war 'C' model has the two doors on the fuselage left side and the MG-34 machine gun on the top. I don't know when the machine gun on the cockpit right side was first used. The pilot operated it by pulling a lanyard.
Jul 16, 2013, 05:02 AM
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Slow and steady


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Jul 16, 2013, 06:06 AM
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Daddy needs a new weighing scale


Did Father's Day just pass by? Girls, papa needs a new weighing scale with higher resolution than this old 5-gram increments one.
Bare fuselage is 65-grams. With added nose block and windscreen, I'll be under the target 75-grams.
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Without canopy:
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Just the canopy. I know, I should have gone with smaller locks but these are the only sizes I have at hand.
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So 5-grams is missing somewhere!
Jul 16, 2013, 11:28 AM
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Aileron and Spoiler/Airbrake Linkage


Many thanks again to Erik (KA-6BR) for the juggernaut of information on the original DFS-230.
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First of the avionics suite installed. Two antennas for the diversity radio modem.
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Jul 16, 2013, 07:46 PM
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DFS-230 at the Gran Sasso rescue of Mussolini


The photos are from the Deutsche Bundesarchiv.

Note that none have braking rockets in the nose. In several photos you can see the drogue chute compartment above the tail skid. Camouflage schemes vary and one registration number, LC + 1-8, can be seen. The left side front door identifies them as DFS-230C versions.

Despite it's widespread use and quantity built, the DFS-230 is not very well documented.
Jul 16, 2013, 08:34 PM
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Quote:
Originally Posted by Ka-6BR
The photos are from the Deutsche Bundesarchiv.

Note that none have braking rockets in the nose. In several photos you can see the drogue chute compartment above the tail skid. Camouflage schemes vary and one registration number, LC + 1-8, can be seen. The left side front door identifies them as DFS-230C versions.

Despite it's widespread use and quantity built, the DFS-230 is not very well documented.
I'd be very careful about making any assumptions about old wartime photos. The censors were well known for airbrush talents and altering things. Several of these look "posed". If the rocket brakes were used in the raid, it is highly unlikely the Germans would be stupid enough to take photos like this that could fall into Allied hands. It is more likely propaganda for home consumption.

The # 3 photo just as one example has been heavily retouched in several spots.
Some of the details in the background on these have a greater clarity and sharpness than things in the foreground, indicating an overlay or composite redo along with airbrush work.
Last edited by JKinTX; Jul 16, 2013 at 09:04 PM.
Jul 17, 2013, 12:11 AM
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Thanks Erik for the photos. I'm waiting for your FF version. Will build a couple of them, aerowtow to it Kanchenjuga, rapid descent with spoilers, controlled flight into terrain and take aerial shots similar to the one you've posted with snow peaks in BG.

The DFS-230 started out as a simple 4-channel analog 72Mhz build to match the Tante Ju mothership but when you put a bunch or retired EEs, well, you know what happens. Now it'll be open 433Mhz UHF openLRS (7-watt Tx) for RC which I've had good experience with. HobbyKing has come out with Orange version which I'm still waiting for. 1.5watt Mondo Extreme 5.8Ghz video downlink for FPV cameras, two in cockpit, one in wing, via 3-way video switcher. Flight stabilization is HK Orange or their APM2.5 clone. Then there's the 900Mhz telemetry for navigation and flight data, including temperature, pressure, airspeed sensors. I'm looking into coding the radio modem to include lost/downed aircraft locator beacon mode activated by magnetic switch. HK navigation strobe lights.
So much electronics: I hope I have enough energy storage onboard as I drew the line on solar panels on wing.
Kanchenjunga is to be our San Grasso/Eben Emael. Longest towline I've used is 150-feet. Will experiment with 100-meters after maiden so I always get higher FPV that tow tug.
It's monsoon here so no flying or even paragliding. Lots of time on my hands.
Only problem I foresee is that I am working off of Klaus Nietzer's plans which has undercambered wings as with the original. The Hawkins plans appear more simple build with flat-bottom (I think Cark Y) airfoils.
Started work on empennage. Both H- and V- stabilators have CF spar caps to avoid chance of flutter due to short tail moment.

Stole the youngest one's action figure. For static scale display, buddy will scale cockpit panels, controls, etc., and aircrew.
Jul 17, 2013, 07:15 AM
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Haha, a very good question. My previous 1.55-meter sailplane builds vary between 300 and 450 grams. This one will be heavier. Weights thus far:
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The battery is the biggest concern and I'll only know the smallest one I can carry after flight tests. I may just have to forgo live FPV and just record video and rely on telemetry from DFS-230 and FPV live video feed from Ju-52.
The extra servo will be programmed to release take-off wheel dolly and then the towline. I am looking around for a lighter continuous rotation winch servo. The B1226 I have is far too heavy, over 100 grams. I'd like to be able to adjust length of towline inflight. Have used nichrome hot-wire cutter for nylon towline release before. It works.

This build won't be entering any F3B, F3J, F3F, etc., events. It won't even be a conventional glider. Like the original, she'll be towed for the major part of the flight regime. For maiden and testing flights (hi-start or off slope), it'll only be the RC gear with small battery. I'll add the rest of the equipment in stages as I get more used to flying her. Once I get sink/glide rate polars, I'll know best airspeed for distance in the final Kanchenjunga configuration.

If I achieve a fraction of the polars of the original DFS-230, I'll be okay to get released on return leg as winds in October-November are typically west to east by south east so I expect good tailwind. As quoted at fpvlab, "My math says 1:1 glide back home......even a library book could make that glide ratio."

WRT leading edges of the V- and H- stabilators, they're triangle stock sandwiched to 3x3mm square stock. The spars are 3x3mm square stock capped by 3x0.5mm CF. Had to reinforce both for protection against flutter and for mounting GSM patch antenna in H-stab and 900 Mhz VP diversity antenna in V-stab. (The horizontal polarized 900 Mhz antenna goes in port wing). I deviated from Klaus Nietzer's plans for a number of reasons. His design does not have spoilers. I just received Hawkins version which I think is more suited to my 1.64-meter WS.
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Jul 17, 2013, 01:34 PM
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Metal-works


The DFS-230 has no compound curves, thank god. The engine dipsticks for checking oil levels of the Ju-52 trimotor tow tug, perhaps? No, the steel has the right tensile properties and cross section for the landing skid and jettison-able take-off LG dolly. I'll just cut off the handle, drill and tap tap holes for the mounting screws.
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Although it looks nice and tempting, I think I'll skip the braking plough anchors.
Jul 17, 2013, 09:46 PM
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MG-15 MG-34 Airspeed Sensor Pitot Tubes


An assault glider needs armaments. The DFS-230 went into battle with a single 7.92 mm MG-15 machine gun mounted aft of the cockpit and two 7.92 mm MG-34 fixed forward-firing machine guns mounted on fuselage sides. Finally found scale replicas of the MG-15 and MG-34. Idea right now is to fabricate separate static and dynamic pitot tube probes for the airspeed sensor and insert them into the MG-34 barrels. Hope it works.






Jul 18, 2013, 09:09 AM
Xroadie
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What scale is this model you are building? If it is anywhere near 1/6 scale there are literally hundreds of scale accessories available from Dragon. Including dozens of WW2 German paratroopers (Fallschirmjäger) and all of their fighting equipment.
Jul 19, 2013, 10:10 PM
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losthorizonmba's Avatar
Quote:
Originally Posted by xroadie
What scale is this model you are building? If it is anywhere near 1/6 scale there are literally hundreds of scale accessories available from Dragon. Including dozens of WW2 German paratroopers (Fallschirmjäger) and all of their fighting equipment.
Hi xroadie, thanks for heads up. At 1.64-meter wingspan, (small I know but I had to match the Ju-52 tow tug), the DFS-230 less that 1/10, more like 1/13 scale.
Jul 21, 2013, 02:13 PM
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Messerschmitt Bf 109 Mistel


Not much progress on the DFS-230. The laser cutting service I use are closed for annual holiday. Work has not even started on the group-build Ju-52 so the DFS-230 will have a lonely maiden. Looking around for a power pod, mind kept coming back to the Mistel (mistletoe) composite configuration of the DFS-230 powered by a Messerschmitt Bf 109. Got the plans off of outerzone.co.uk, scaled it down to match the DFS-230, and off with another monsoon scratch-build.


The Bf 109 "power pod" will have to channels, one for throttle, other for inflight mixture control for the 1.5, 2.5, or 3.2 cc diesel (kerosene, castor oil, ether, amyl nitrate mix). No flight controls, just ground adjustable trim tabs to counter over-propping torque.
Started off on the wings, just 16 ribs to hand-cut.




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