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Ace Hobby . Esprit Model . Thunder Power RC

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Henseleit 3DNT - Rocket - 3DMP > proud new owner
 
 
1hander
Senior Heliman
Location: San Antonio, TX

all i gotta do is put it together, and hope i can fly the dam thing
hehehee
rick
05-29-2003 Over year old.
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Carps
Veteran
Location: Caterham, Surrey, England

Congrats on your new heli. A fine choice.

What set-up did you go for in the end (servos/engine) ?
05-29-2003 Over year old.
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Naomi
Elite Veteran
Location: Ontario, Canada

Rick, that's cool.. from gasser to turbine back to nitro.. you're going to change your member name to nitrorules?...

Naomi
05-29-2003 Over year old.
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Sam
Senior Heliman
Location: Chandler, AZ, USA

Great news. I'm sure you will like the quality of the kit. From my way of thinking everything is first class.

Now. Answer Carps so we know what you are going to run.

Sam
05-29-2003 Over year old.
 
 
1hander
Senior Heliman
Location: San Antonio, TX

setup

im gonna be a retard and run nothing they recommend because its what i got left from the turbine. 8231's --GV-1---30% ---710 razors---raptor tails---GY601---i setup the mxing on the flybar 1 to 1 ratio, and im gonna start slow on the throws, i dont have a set of 30 gram sabs which i want, so ill be using the vario 3d blades which by the look of them should 3d like hell and be nice and pitchy in fast forward flight which from what im told this thing really fast..

its friday night, i fired the engine up, that thing purrs man it idles sweet,
ill be out grabbin the bull by the horns saturday morning finishing setup at the field..the landing gear seems a bit wobbly, but ill manage i hope..

went without remote glow driver, i couldnt find anywhere to mount, i came up with a really nice way to situate all radio gear, but it puts the gyro sensor in a 2 inch proximity to the reciever, which i dont know if that will be a problem.. well see!!!!!!!!
rick
05-31-2003 Over year old.
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1hander
Senior Heliman
Location: San Antonio, TX

tragedy

this thing flew awesome for 5 mins, then hit the deck tail first, it was decending, the head was overspeeding , it shook violently, then i had no control,

1. two servo gears were stripped, was this a result of overspeeding the head followed by an elevator input causing gears to strip

2. none of the control rods were disconnected, good bat,

3. i set the blades up leading instead of trailing, could this have caused the failure,

4.0 im changing the ratio to 8.8 or higher when i order parts monday , the 7.7 does not suit the webra at all......
input appreciated

regards rick
06-01-2003 Over year old.
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Sam
Senior Heliman
Location: Chandler, AZ, USA

Sorry to hear that Rick.

From what I have been reading I have the same impression as you - the Webra has to turn a higher rpm than the OS to perform properly. The 8.8 is certainly worth a try.

I remember something about putting the baldes in trail otherwise flutter was a possability. Perhaps that is what stripped your servo gears, although it could have been the crash as well.

I know you were using servos you had on your turbine but personally I would go to servos with metal gears. Apparently these servos are put under one hell of a strain and the plastic gears may not be up to the job.

Just a few thoughts - I'm certianly not an expert.

Sam
06-01-2003 Over year old.
 
 
Carps
Veteran
Location: Caterham, Surrey, England

Rick,

Jan Henseleit specifically says do not reverse the blade holders !
Whatever possessed you to ignore that advice ?

BTW, what kind of head speed were you up to ? I have run mine at over 1930 just to try it, and no real bad vibration. The OS wasn't too happy at those RPM, but the airframe was OK.

It is worth realising that there are a couple of 'fuses' in the control system - namely the servo gears, and the delrin flybar guides in the head. The idea is that these things break, rather than causing more serioous damage elsewhere. They are relatively cheap to replace (delrin parts about $14, plastic servo gears about $8). Likewise the under carriage design - in a bad hit the undercarriage can rip out quite easily. This saves any damage to the carbon sideframes.

Regarding gear ratios, people have had success with the Webra on 8.3.

Good luck with the rebuild, and hope you have more success next time.
06-01-2003 Over year old.
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Andi G
Veteran
Location: Switzerland

Hi,

go with 8.3, 8.8 is really high!

And you must set up the main grips the right way, when the NT first came out the was a flutter problem, which was solved by turning the grips around.

Andi
06-01-2003 Over year old.
 
 
1hander
Senior Heliman
Location: San Antonio, TX

im retarded

i have made new, mainshaft,spindle,tailboom,flybar,tailshaft, tail pitch slider, and tail belt idler wheels, thers was almost no damage up front at all.
these are not stock parts, but will get me flying while the original parts come in.
for anyone interested heres what i made my parts out of
1. spindle --raptor 60 spindle cut drilled and tapper to size with lathe
2. mainshaft--spare vario 10mm shaft cut and drilled to size
3. tailboom--1 inch aluminum shower curtain rod cut and drilled to size
requires turning the inside diam of tail gearbox larger
4. flybar--excess 3/32 s/s rod i already had cuat and threaded to size
5. tail pitch arms--used the pitch mechanism from old gas xcell
plastic gearbox
6. tail shaft--had 3 spare xcell tail shafts cut and milled flat spots
7. tail belt idler wheels--made of delrin on lathe

the pipe had dents in it and 2 holes, i cut the pipe apart just before the baffles in the back, rolled out the dents, the holes almost sealed themselves, then tig'd it back together.

im waiting to order some parts for the tailboom supports, servo gears and a upper case and gears for the 601 servo, and governor control box which never worked anyway.. does any one know what diam the carbone tubes for the tailboom supports is.

i wanna fly this again, you can probably tell!!!!!!!

i had a feeling that reversing the grips may have caused it, you guys have just confirmed my idiosy..ill try again this weekend
06-01-2003 Over year old.
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Pascal
Senior Heliman
Location: Paris, France

Hello,


I can understand you want to fly it again but I am concerned about some of your repairs :

3 : Tailboom made of Aluminium : the carbon one has the advantage not to change its size with temperature. You will have to check before flying the tension of the belt. Slightly too loose the helicopter vibrates, too tight and it may break.

7. tail belt idler wheels : Are you speaking about the two located inside the frame on the aluminium tail holder ?
If so the original ones are made of carbon, and there is a reason for this.
They deposit carbon dust on the belt which allows the two sets of small ball bearings located near the pulleys to remove static electricity from it. Having them in derlin does not help this purpose.
Check also that you have zero Ohm from the engine to the aluminium tail gearbox.
Jan mentions that you may experience severe radio interferences if this is not the case.
Will you continue to fly it with plastic gear servos ?
I am also surprised that you do not mention the delrin parts of the heads. They act as fuses in case of a crash and break easily.

Pascal
06-02-2003 Over year old.
 
 
drkite
Heliman
Location: Ulm/Germany

Hi Rick,

in addition to what Carps already set, do NOT REVERSE the blade holders. I have read in a German discussion forum, that back in 2001, when the NT was introduced to the market, there were some failures similar to yours because of strong vibrations of the whole rotor head. Jan himself posted several messages on that forum, that they were aware of the problem, investigating the cause of that problem and finally found the solution. (Interesting side remark: they found the cause of the problem together with the manufacturer of the electric Joker heli; this heli has got a similar moving flybar rotor head).

The solution to the vibrations was simply to change the position of the connection between the pullys and the blade holders, i.e. reverse the blade holders. Since then, it has never been reported again about any problems of this kind with the 3DNT. So in short: the connection of the pullys MUST be on the back side of the blades!!!

Bernhard
... eagerly waiting for his new 2003 production NT...
06-06-2003 Over year old.
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duc996bp
Senior Heliman
Location: Preston, UK

New NT

Bernhard

Is Jan bring out a new NT this year?

John
06-06-2003 Over year old.
 
 
drkite
Heliman
Location: Ulm/Germany

Hi John,

it's not a new NT, but Jan keeps on changing some (few) bits and pieces every year with the new series, sort of fine tuning. I have read somewhere, that Jan produces each year a lot of approx. 400 NTs and once those are sold, you have to wait until next year. Delivery of the first boxes with the 2003 NT has been promised for early June.

However, in the German news group rc-heli, Jan has announced that he is currently developing a smaller heli, which will appear in 2004 on the market. This new heli will right from the start be suitable for eletric engines and will be smaller than the 3DNT.

Bernhard
06-06-2003 Over year old.
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duc996bp
Senior Heliman
Location: Preston, UK

Bernard

I want to buy a 3D NT, I think I will wait until the 2003 version becomes available.

I assume it will be the MK 4 version?

Any idea what will be different?

John
06-06-2003 Over year old.
 
 
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Henseleit 3DNT - Rocket - 3DMP > proud new owner
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