I translated the article of the Les Fruh Taurus, the reference as shown in post 1 of this thread.
The span of the stab and dimensions of the fuselage already were recalculated some time ago, with these added data so more detail engineering can be done this winter.
To complete this thread the text of the article;

The question of a successor to the Taurus must be on the mind of many multi enthusiasts and the picture No, 4 will profide some of the answer,
This is Taurus II by Les Fruh, Evanston, Illinois, as seen at the U.S .Nats. (1963 TF)
Basically it is a stretched Taurus. The nose and tail moment are longer, but there are other changes. The thickness ratio of the wing has been increased from 19 per cent to 22 per cent and the tail and the tailplane is also abnormally deep. The fin is very thick with a proper airfoil section and the wing has a swept leading edge.

With all these data it will be possible to create a detailed replica of the Taurus of Les Fruh, but first the plans.

Cees

Discovering the secrets of the Taurusses!.

I experienced it before, during the range check we could use a 446 MHz TopCom Twintalker 3000 (portophone) set of 0,5 watt near the superregenerative receiver without any negative influences, even not when the radio control transmitter was at a distance (over ground) of 860 m.
So for me it was interesting to know if a real-time downlink also would be possible with the superregenerative receiver.
Results are positive. A 200 MHz transmitter near the reveiver of the plane doesn't have any influence, also not at the max distance of the control transmitter.
The 200 MHz downlink receiver in my cap is also normally receiving when the radio control transmitter is switched on and used by me.

It all looks useable, the tonefilter radio with the superregen reveiver and all added modern technical stuff. My safety system will be the radio tube transmitter with a plate(anode) high tension switch just as used by Kraft in the past.

The proportional 35 MHz radio with single or double conversion receivers I also can use combined with the downlink, I do this for more than 35 years without any problems, only point of attention is the transmitting frequency of the downlink related to the 35 MHz, so I don't use 105, 140, 175 or 210 MHz for example.

On the photograph the superregenerative receiver, battery and servo's switched on near the transmitting 200 MHz downlink during the test.


More to come.

TF

pd1 did show us the weight of the Duramite Bonner 2 channel servo, see post

http://www.rcuniverse.com/forum/fb.asp?m=8117596

after that the weight of the Orbit reeds receiver known by rfj, 3.5 a 4 oz, see the posts on that page.

So, total weight of the radio of Ed's ship as flown during the contests of 1961 and 1962 untill he modified it to proportional must have been about 650 grams .

Because his reeds systems also were relailess these could have been lighter than my tonefilter system, expanded to the needed 10 channel
A reason for me to make a comparision.

Estimation of an original complete Orbit Reeds-relailess system in the Taurus
5 cell 6VDC NiCad 120 grams
reeds receiver 110 gram
Duramite 87 gram, but 5 times so 435 gram

Totall weight 665 grams

Estimation of weight of my scratch built tone filter relais system
4 cell 4.8 VDC NiMHi 134 grams
Servo's (modified) 44, 5 times 220 gram
Tone filter receiver recalculated to 10 channel 400

Totall weight is 754 grams

My system will be about 90 grams heavier, that's too much!
Option will be, build a new 10 channel relailess receiver.

I can also can save some weight, but not that 90 gram, by using a light accupack, I don't need these 2700 mAh.

To give you an impression of the actiradius!

Current draw of a (pré-brownout period) receiver is less than 3 mA, added the 50 mA when a servo rotates, simultaan max 2x = 100 mA.

So 2700 mAh is enough for a flight of more than 27 hours!!!!!

An airspeed of 100 km/h in straight direction, will result in a radius of more than 2700 km. That's enough to fly my (replica of the first successfull and) Oldest Taurus on Earth from Manderveen to Georgië or from Saint-Pierre en Mequilon to Georgia.

Looking at the dimensions in the fuselage, any relailess receiver, accupack and (modern!!) servos will fit in place without problems.

So, conclusion, it's possible to expand the radio and fly the Taurus witin the specifications Ed did during the contests in 1961 and 1962 before he modified the plane and used the proportional, see photograph 2, but for that there is some more work to do, so more to come.

Cees

Gents,

Pictures are all gone now, interesting to see if these will came back in the future.
I am glad I did make back ups because this thread is very valuable for me.
Uploading a photograph of the wing joiner of the Simla isn't possible now.

More to come

Cees

Test upload pictures.
Failed, so we still have to wait a while.

More to come.

TF

Yes!!! Thanks technicians of RCU!!

Hanna and Cees

Joe (PT19 flyer) and other readers,
I received some e-mails from Joe about the construction of the Taurus and "slender look".

Important to know is the slender look is mainly a matter of visualization, the result of the special paint scheme.

I show two photographs,
These are the same Taurusses before and after covering and painting.
I also show you the combined picture, one with and one without the paint scheme.

So Joe, if the Taurus on bottom looks slender, your construction probably is alright, but the result you have to evaluate after finishing. Let me know your impression about the picture!

BTW yesterday I sent you the Taurus MAN article, did you received it?

Success
Cees

Beside the explanation of the "slender" Taurus as result of the paint scheme of course there was one real slender Taurus and that's the Taurus this thread is all about.

Ed Kazmirski and Bob Dunham did cooperate together to gain success, Ed by designing the Orion and the successor Taurus and promote the radios, Bob by develop his Orbit radio systems.

After eliminating the relais of the receivers by using amplifiers (Bonner Transmite vs Bonner Duramite) it was possible to significantly shrinking the receivers. Ed did use these relay-less receivers of Bob Dunhams Orbit radios.

This small electronic detail was the main reason I recognized the slender fuselage in the crate of Africe and started my examination.

There are no plans of this first successful contest Taurus (called by me, Oldest Taurus on Earth), Ed did fly contests with it and modified in several stages to meet his requirements. I only reconstructed this first known of the nearly 10 versions (development steps!) I know.

A picture I made in 2008 during the reconstruction process. Studying of the fit of the earliest Orbit proportional radio in the slender fuselage, one of the development steps of the past of Ed's personal pattern ship.

Cees

ok Cees

thanks for reply and info. quit work temporilary on fuselage and now working on wing.
at the stage of construction of installing the leading edge. went to hobby shop to pick
sheeting which appears to be softer and maybe<hopefully> more easily bent around leading
edge of ribs. if successful will post pic of wing when this step is hopefully completed.
I had always used ammonia solution to make the balsa more easily bent but my buddy at
the hobby shop suggested I use white vinegar, said it worked much better so going to give
this suggestion a try.
did you receive my question about the leading edge curvature installation? I read somewhere
may have been on this thread to draw a line down center of 4" wide sheet and center this on
ribs<going thru the bent installation as suggested> and gluing this on first then when glue dries
finish the leading edge top and bottom sheeting. your thoughts here.

again many thanks for your help and suggestions, been extremely helpful and appreciated.

can hardly wait to see it this dude will fly. first construction from plans in about 20 years.
things slowly coming back. last kit built about 10 years ago.
not really a great arf fan, have always like to fly what I build, but at 82yrs old things sure seem
to move very slowlyha!ha!

thanks and happy flying

pt19 flyer
joe

ok Cees
I think I see what you mean. looking at the two photos I guess the dark blue bottom on the
fuselage does seem to make it appear more slender.

have my wing to the point of attaching the leading edge and I read somewhere that the best way
was take a 4" wide sheet and mark a center line down the center, to thru the curvature process
and center the line on the leading portion of the ribs. apply glue to the bottom portion let dry and
continue gluing process, then when dry continue with rest of top and bottom leading edge attachment.
sound practical? your thoughts here or your method of application.

again many thanks for all your help and suggestions.

happy flying
pt19 flyer
joe

Joe,

Are you familiar with bending balsa?
The best way to go is bending the balsa first before applying over the ribs.
Take a pole , soak the balsa in water and ammonia and after an hour you kan bent the balsa carefully over the pole and wrap around gauze bandage.
Let it dry. When bending isn't possible in one step, use several steps.

After that the process you wrote.

Best shape of the pole would be the cross sectional dimension of the nose of the ribs and that would be an added effort but worth the good result.
For the Taurus of this thread, Oldest (successful) Taurus on Earth and the Simla, I made a bended turtle deck, not having the balsa blocks.

For wings I myself use a nose reinforcement in form of a balsa spar made of 10 mm balsa vertical positioned.

See for examples for bending balsa, START POST 40 of this page:
http://www.rcuniverse.com/forum/m_79...tm.htm#8049000


Wing with nose spars:
http://www.rcuniverse.com/forum/m_79...tm.htm#8237976



btw did you receive my information about the elevator lever and pivots?

Success, Cees

hi Cees

did not receive info on elevator lever and pivots.
was wondering if this was attached to horizontal stab in some way or
just attached to elevator.

thanks and 73's
joe

It is a nice trophy..... A little worn, but still nice....

hi Cees

I did do some balsa bending years and years ago but not recently. just getting back into
building from plans which in the past I had thoroughly enjoyed.

I had downloaded a picture of the elevator control setup but did not receive anything
concerning the pivot points. does it just connect to the elevator portion or is it
pivoted off the horizontal stab?

thanks in advance
joe

Gents, I received a question, a PM, and for answering this thread is a better place I think because maybe more vintage minded pilots are interested.

The question: Why the Taurus appears to be so revered?

Orion

It's not only the Taurus but a combination that was the key for succes so we have to go some further back, 1960.

Ed Kazmirski was world champion of the very first organized championships pattern flying in 1960 in Dubendorf Switserland. He and his Orion were famous after this moment, just as Orbit, the radio system of Bob Dunham that was used by ED.
Orion kits were available short after that, made by Top Flite.

First (successful) Taurus

To stay on top a succeeder was needed and the developing proces started as normally after the pattern contests of 1960. The Orion was a tail dragger but the tricycle had a better perspective that period and even you can put a tricycle gear on a taildragger (Yes, the Orion tricycle was there in 1961 !) there still are principal differences that cannot easy been overcome.

So, the first succesful Taurus of Ed Kazmirski was designed and constructed early 1961, after a less successful first attempt so called by "Flop".
The Flop was the first plane designed by Ed as a real tricycle but rejected after dissapointing results (glad the Orion was also there, even it was converted to a tricycle!).
Keep in mind, designing and developing these ships was a process of months. Small modifications, adjustments, changes in dimensions and test flying. Ed already wrote about this process related to the Orion.
The radio systems used by Ed in this period were the smallest available, the Orbit relay less system with the Transmites actuaters. Bob Dunham and Ed Kazmirski already cooperated during the 1960 worldchampionships.

The first successful Taurus was the eye catcher of 1961, second half of the year. see the attachment 4.

Frank Myers Taurus plans

After that Ed designed the commercial Taurus for interested modelers.
Plans were drawn by Frank Myers in December 1961 and distributed. The wings were interchangeable for Ed and more room in the fuselage was the most visible difference between that "First Successful" (relayless!) personal ship and the "later commercial" drawn by Frank Myers.
Most modelers didn't have these small Orbit relayless systems and a small cross sectional surface would be a real bottle-neck for most of them.

Top Flite Taurus

The Taurus was a succes and at some later date we also see the first (pre-production) Top Flite Taurus of Ed Kazmirski, in April 1962, at the trip to Rhodesia and at the 1962 NATS.
Ed became the NATS champion in 1962 so the Internats of 1963 in Genk Belgium was the next destination! In 1962 also a lot of other contest contributers succeeded with the Taurus at several contests in the USA.

Because Ed already was known world wide, and the Taurus promoted in England and Africa during his trip to Rhodesia in April 1962, we see short after that the Taurus, kitted by Top Flite, distributed all over the world.

Result? In 1963 at the worldchampionships pattern flying in Belgium Genk with 39 participants, we saw 17 Taurusses! See the First attachment the ranking of these Taurusses when we "forget" the other contributers. There also were 3 Dutch Taurusses and as far as I know Jan van Vliet is still pattern flying!!

The answer: Why the Taurus appears to be so revered!


That personnal Taurus of Ed he started with early 1961 was later developed in about 10 steps and used several years by Ed as primairy pattern ship, this Taurus did show up after Ed's passing away in December 2007! This Taurus never got much publicity for several reasons, the Top Flite did get all the attention (commercial!).
So reconstruction of the history of the First successful Taurus and the replica is an individual story of later date and was only possible after photographs became visible. Most of these photographs of the personal estate of Ed.

The Top Flite Taurus pre-production fuselage and the wings of that first personal Taurus of early 1961, as combined by Ed to fly in Belgium Genk, also are still existing as a Taurus and part of the collection of the AMA museum in Muncie! See the second attachment, Maria Vanvreede (r)(AMA museum), Bob Noll (m)(VR/CS) and Micheal Smith (r)(AMA museum),

TAURUS

In general Eds Taurus is known as the first real model airplane, multy pattern ship of the world!
For Ed the name Taurus was related to several unique pattern ships,
1 Flop and the personal developed Taurus of 1960/61 and later modified over about 5 years of “service time”,
2 Frank Myers, Top Flite and other commercial examples as MAN, RCM & E and
3 the last one, the Simla.

Simla

The Simla is the latest designed Taurus and a 150 % version of the first successful Taurus Ed started with (after the Flop) so he went back to the roots I discovered!!
To reconstruct the Simla all data I did find about the First Taurus was very helpfull and “in ratio”. This Simla is still under construction now but I can show the computer model, third attachment. Also most Simla photographs were part of the estate and the key for a successful computer/graphic reconstruction.

Cees

hi gang

a little more progress on the taurus build . here is wing with partial wrap around on leading edge.
a little clumsy rough handing during this process and ended up breaking off some to the trailing edge
tabs. tried to keep bottom spar flat on build ing bench. hope this was enough for a straight wing.

thanks and happy flying

pt19 flyer

getting closer guys...
here are latest pix...tail feathers not glued yet
just pinned on temporily.

thanks and happy flying
pt19 flyer

hi guys

building a taurus and have never seen the paint pattern ed used on the bottom of the wing.
is it the same as the top, not there yet but getting closer.

thanks
pt19 flyer
joe

Joe,

Same basic pattern but without the orange "swoosh"

Ray

Hello Joe,

That will be a very nice Taurus, great !.

Yes the paint scheme!! Interesting question.

I do have the crate picture, the important photograph of this thread, this project.

There is shown bottomside of one set of wings. These wings basically belonged to the fuselage on the right side in the crate. That is the "First successful Oldest Taurus on Earth".

The fuselage on the left side and the wings on the right side, together, were the Taurus Ed flew in 1962 at the NATS. No bottom visible!!

The wings on the left side don't have the small red dash on the white back ground, but rest of the scheme is identic with the top side.

Best thing to do is use same scheme on bottom as on top but without that small dash.

Still interesting to know!
In this thread you can read the wings at the left side in the crate Ed did use at the world championships in Genk 1963, instead of the wings at the right side!!
These are also the wings that are in the AMA museum in Muncie now, together with the left side fuselage!
The Taurus I show is the replica of the right side fuselage and the left side wings, the first successful Oldest Taurus on Earth!




Success Cees

Hi Cees,

Just curious - have You ever flown any of Your Taurus planes with same make and model of engine(s) as Ed had in his Taurus planes?
If yes - how was it?
If no - why?

/Bo

Bo/

The engine of the Oldest (successful) Taurus on Earth (right side fuselage) was a K & B (Allyn) Greenhead of smaller displacement than 0.45, (0.35 ci). I never owned such an engine and use an OS Max 35 FP instead. A single chamber muffler is mount to comply the regulations.

A video of me, flying the Taurus:

http://www.youtube.com/watch?v=mK8TGW-fL44

Of course vintage pattern is another way of flying, but with this engine power it's still remarkable what's possible. Observe the take off, grass, no problem. This Taurus has the span of a normal Taurus, +/- 68", only a sleeker and shorter fuselage
Loops must be made small with the use of accumulated speed.
Flying is very relaxed and goes parallel with low amount of fuel.
Compitive it can be when all participants are flying with same engine displacement and even if the counterpart uses a .45, this Taurus can be a winner.

I have a Webra 6.5 ccm that also fit in the plane because a mounting plate is used just as Ed did.

The replica of the NATS winning Taurus also does have several engines but not a VECO xx RC.
The first engine was a HB 10 cc, and now an OS Max 61 FX or the MVVS 10 ccm.

Ed did use his well known philosophy to create constant speed for the Taurus, the thick wings. I went one step further and added cruise control and that’s why flying this ship cannot be compared with manual throttled pattern planes. I normally fly the plane with throttle stick in nearly fixed position for setpoint speed, the throttle is controlled by the electronics to maintain that speed. To have enough authority for speed control the displacement of the engines is more (10CC) than original(7.5cc).
This way of flying also does give a more effective brake function in down going paths. It can be the first and only glow propelled pattern plane with real functional cruise control in the World.
Just as the Taurus generally was known as the first real multi pattern ship of the past, can flying a Taurus these days still be unique, that's "why" I fly the Taurus my way.



Cees

hi Taurus Flyer and RFJ

thanks guys for your info to my question
I have received very friendly and helpful informaltion here, really, really appreciated.

Cees
now working on the elevator linkage for the horizontal stab, have it completed ready to install which
I hope to do today, then I will attached horizontal stab and vertical fin. will work on the elevator install
before attaching stab.

again many many thanks

pt19 flyer
joe

Joe
Have attention for the glue joint, the mechanical connection of the stab on the fuselage. It is known as one of the weakest joints of the Taurus. I make the joint extra wide by use triangular fairings on the bottomside of the stab with the sides of the fuselage.
See the picture!

Cees

hi taurus flyer

done, followed your suggestion on the horizontal stab install

many thanks

pt19 flyer
joe