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Old Jan 14, 2012, 01:03 PM
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For ESC I will use a nice solid one that's left over from the Me-262 project.

At the time the K-Force 120A HV wasn't available for months, so I had taken the one below as an alternative solution.

Later one I was able to locate a pair of K-Force 120 so that's what I used there.

The Turnigy K-Force 120A HV is made by Hobbywing (and sold under other brand names besides Turnigy).

The one below (Turnigy Super Brain 100A HV) is actually made by HiFey and sold worldwide under a number of other labels ...

http://www.hobbyking.com/hobbyking/s...hless_ESC.html

I have both the programming box and the USB adapter for it, which makes programming very convenient

.
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Old Jan 14, 2012, 01:12 PM
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Since the prop will turn at some rather high rpm, I will need to make sure the prop is properly balanced. So that the motor won't fly off and the bearings will last a bit longer

Besides my home made one, I plan to also use this nice, but relatively inexpensive, little magnetic balancer from HK:

.
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Old Jan 22, 2012, 01:20 PM
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With all the rain here I've been able to do a bit more work on the Me-163.

The BMS-760MG Bluebird servos I got from HC fit right in without major surgery, they are very nice low profile servos.

The black plastic clevises that came we the kit were replaced with metal ones.

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Old Jan 22, 2012, 01:26 PM
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The rudder was hinged in the way described in the kit, after slightly enlarging the round holes for the nice plastic hinges.

The rudder linkage now uses a long carbon rod, around the original wood rood
which did not seem rigid enough to me...

I also reinforced the rudder horn a bit, that single set screw did not seem enough.

While waiting for the glue to settle, I removed the cross from the fin, it peeled right off, and was later cleaned up with a bit of alcohol.

.
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Old Jan 22, 2012, 01:30 PM
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I like to have lots of room to move the batteries around to get a proper CG, so I decided to move the rudder servo out of the way, on the side.

I made a simple ply mount for it, which I then glued with PU glue and Hysol to the fuselage. Not much sticks to polyester, so the hope is that at least one of the two glues will stick

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Old Jan 22, 2012, 01:34 PM
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I got this book from amazon.uk, it was written by a former Me-163 Komet pilot, Wolfgang Spaete.

http://www.amazon.de/Der-streng-gehe...e+vogel+me+163

He seems very knowledgeable on all sorts of technical details regarding the Komet, from the earliest design stages to its operational history.

The book is surprisingly well written, one interesting tidbit is that Lippisch and Messerschmitt did not get along too well, with M. claiming that L.'s calculations regarding deltas, and in particular their higher aerodynamic efficiency (from being tail-less), were wrong.

M. had his own enginneers redo all the calculations to see if L's claims were correct, and they eventually disagreed with L's results.

Indeed the book describes how the advantage of the delta planform were later negated by that huge tail which added a ton of drag. And by the fact that a bigger excursion of the elevons was needed for maneuvers compared to a standard tailed design, due to the shorter lever arm on the former ...

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Old Jan 22, 2012, 01:46 PM
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An appendix in the book covers a few detailed design aspect of the Me-163.

I found it interesting to see that the original Lippisch airfoil had reflex built into it from the very beginning, L. knew back then (1940) that reflex and washout were required for stability.

Apparently they had a bit of elevon flutter problems initially, as the airframe was just too fast

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Old Jan 22, 2012, 01:51 PM
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German test pilot Hanna Reitsch flew one of the early Me-163 prototypes.

The dolly malfunctioned and she few back to base, she landed so hard that she hit her head on the gunsight and ended up in the hospital for half a year with a broken skull and smashed nose.

Heini Dittmar shown below was the first Me-163 Komet test pilot,

http://en.wikipedia.org/wiki/Sound_barrier

perhaps EDF designer Heino Dittmar is his son ??

http://www.rcgroups.com/forums/showp...0&postcount=11

.
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Old Jan 22, 2012, 02:13 PM
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United States, CA, Salinas
Joined Oct 2006
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ME 163 build

Hi Herb,
I started building my ME 163 and from past experience knew it would need
some reflex in order to fly correctly. I don't believe there is any mention
of this in the kit. I'm thinking of powering mine with a Hacker 50 A12 S
I have always been interested in the 163 and other flying wings like the Horten
they were way ahead of their time.
Back to the subject, I was thinking of using a Graupner folding prop on mine,
what do you think?
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Old Jan 22, 2012, 02:38 PM
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Hi Demeeks,

I agree it's my experience as well that deltas need reflex, all my delta edfs need it in some way or another; just a bit is usually enough.

Yes I guess a folding prop is a very good option ... I read somewhere that people fly it with a folder. And Graupner makes some of the best.

I still have a few Graupner folders, some can take a lot of power, the ones with a beefy aluminum hub and russian-made carbon blades.

I read that the folders reduce the amount of broken props on takeoff, and of course cause less drag when folded.

I think on mine I will go with standard APC-style electric props because a) they are cheap and I can get them at the lhs b) you can get almost any size/pitch c) there's no issue in finding parts, and d) some extra drag on landing might be a good thing

The Hacker 50 sounds like a fantastic setup !

http://www.espritmodel.com/hacker-a5...es-motors.aspx
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Old Jan 22, 2012, 02:42 PM
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United States, CA, Salinas
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ME-163 build

Herb,
I recently had the Hacker in a Kelly race plane and was using an APC 12X12
with a 6C 3200, the performance was quite good and your right, they are easy
to come by, I may just go that direction.
What do you think about CG location?

Don
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Old Jan 23, 2012, 11:18 AM
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Hi Don,

I've read that a CG of 6.25'' or 165mm from the LE measured at where the wing meets the fuse works well.

Also I will add a few mm of aileron reflex on mine.

(It is quite possible that some tried to fly it without reflex at the given CG, then found in flight they needed up trim, and concluded it was nose heavy - it was not).

Are you close to flying yours ? Post some pictures !
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Old Jan 23, 2012, 11:36 AM
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United States, CA, Salinas
Joined Oct 2006
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Me-163

Hi Herb,
I too read that some had tried to fly without reflex and didn't end well.
Thanks for the input on the CG. I'm still a ways from flying.
Was thinking if using a single wheel just forward of the CG and maybe a
drop off dolly as appose to a skid. At our field we have a hard surface runway
and the rest of the field is somewhat rough. I have several scale sailplanes
and the single wheel seems to work Ok.

Don
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Old Jan 23, 2012, 01:22 PM
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Danmark, Nordjylland, Sæby
Joined May 2010
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Running a little hot

Hi Herb

Almost lost my 163 the day of newyear, Flying my ME 163 and suddenly the ESC burned, and after a fast landing, where Thomas was very quick to find the screwdriver, we succeeded to get the burning ESC and batterys out of the plane before the whole plane caught fire.
Burning Esc. ME163. (4 min 33 sec)


Set up was:
Turnigy 42-50. 1000 motor
http://www.hobbyking.com/hobbyking/s...idproduct=8489
9x9 prop
110 Amp ESC (Birdie)
4 x 3cell 1800 Mha batteries 2 paralel and 2 in serie (6 cell)
Its a Wega sunshine modellbau 135 cm span. 81 cm long

Motor and plane is still ok, but next flight will be with my new EDF motor:
Turnigy SK3 Fandrive - 3659-1900kv
http://www.hobbyking.com/hobbyking/s...dproduct=19110

And this ESC:
100A, burst 150A up to 10 seconds
http://www.hobbyking.com/hobbyking/s...idProduct=9328

It will be running on 4 to 6 cell (depending on the Amp/watt) and 7x7 speedprop.

Cheers
S
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Old Jan 23, 2012, 08:06 PM
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Yes I have been thinking about the dolly too - no work on it yet though.

S thanks for the post, I have the same EDF motor and that ESC as well, both are top notch (they run in my CMP T-45 with a WeMoTec Midifan). The ESC is very well made, Hobbywing, and easy to program with the box. The HK EDF motor runs cool in EDF at 1500-2000W .

What is you CG, measured at where the wing meets the fuse? I see your wingspan is 135cm = 53'', whereas ours is 154cm = 63'' - so ours is just 14% slightly larger.

It is very interesting that you run such a small prop, I think most outrunners will fly apart and/or destroy the bearings past 15k, hence the need for an inrunner...

The video is impressive
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