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Advantage Hobby . Revolution Models . CarbonXtreme

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Henseleit 3DNT - Rocket - 3DMP > Need help on needle setting of my OS 91 lotterle carburater on a 3DNT
 
 
rayson
Heliman
Location: Mililani, Hawaii

09-17-2003 Over year old.
 
 
helifever
Senior Heliman
Location: BE-8750

main needle about 3 or 31/2 turns open at first

small needle open till it is equal to the house it's in

helifever
09-17-2003 Over year old.
HOMEPAGE  
 
 
ogl
Senior Heliman
Location: Madrid. Spain

What fuel do you use?
09-17-2003 Over year old.
 
 
helifever
Senior Heliman
Location: BE-8750

12% oil 1% nitro
09-17-2003 Over year old.
HOMEPAGE  
 
 
rayson
Heliman
Location: Mililani, Hawaii

Thanks to all of you who responded to my question. I will be using 5% Cool Power. I hope that this heli will not be a disappointment since I am still uncertain how the new MA Tempest heli campares to 3DNT. Anyway thank you once again for responding, runryder is currently the best source for information because of people like you folks. It is hard to find help here(Hawaii)where I'm at, since I am in the middle of the Pacific ocean.
09-17-2003 Over year old.
 
 
ogl
Senior Heliman
Location: Madrid. Spain

I use 12% Klotz oil no nitro.
My main neddle setting is 2 1/4 turns from fully closed position, but I'm using the Zimmerman pipe instead the recommended Hatori.
09-17-2003 Over year old.
 
 
DangerousDick
Veteran
Location: Cheshire, England

The Lotterle carb is specifically designed around 0% Nitro - you may need a different needle setup to get the best performance out of 5%. I've never put Nitro anywhere near the 3D, never needed to - nice to keep the costs down .
09-18-2003 Over year old.
 
 
Pascal
Senior Heliman
Location: Paris, France

Actually, even if it is designed to run without Nitro, you can have some, provided you use the appropriate needle.

This carburator is by default suited for 12% of oil, and more precisely of Syntheglow., (available in germany)
12% of Syntheglow, 1% NItro and 87 of methanol gives you a very powerful and smooth OS91 FXH with such carb.
.

Personnally I use Micromotul, 12%, no Nitro. It runs great, although it smokes more than Syntheglow.
With no nitro or 1% you do not need to have specific corrosion inhibitor.
But CP5% may includes more oil than 12%, so you will need another needle than the standard one.
My advise, try to know the % of oil of CP0%..

Pascal.
09-18-2003 Over year old.
 
 
Mart
Heliman
Location: Wiltshire,UK

In the UK, Rev Models sell the Model Technics fuel with 12% oil and no nitro. Anyone in the UK using this fuel and the std OS engine have any needle valve settings?
Any advise on settings and number of tanks running rich etc.
I personally hate running engines in, in heli's!!

Martin
New 3DNT owner, 50% built!!
09-19-2003 Over year old.
 
 
Nige
Senior Heliman
Location: Hull, UK

Rayson,

I use Coolpower 5% (Best compromise I can get locally) with the 'standard' Loetterle Carb supplied by Revolution models. The bottom end has to be set a little rich to get the midrange correct but it runs very well (vid in my gallery) . I use the standard os91FX and Hatori 700 setup with an Enya 4/5 plug.

Nigel
09-30-2003 Over year old.
HOMEPAGE  
 
 
Carps
Veteran
Location: Caterham, Surrey, England

On the Model Technics 3DNT fuel as brewed for Revolution Models, both my NTs were on 2.5 turns out on the main, and the low end screw was just standing proud of the hole. Both ran a touch rich like this, but I preferred it that way.
09-30-2003 Over year old.
HOMEPAGE  
 
 
Mart
Heliman
Location: Wiltshire,UK

Guys,

Help me out here.
I'm coming back to heli's after a 12 year break !!
Now have five tanks through the 3DNT, flying great but...

I'm out of practice with the engine set up and need to fully understand the pros and cons / symptoms of running rich / lean !?
I think I'm now running a little too lean!? Had the engine cut in a downwind circuit, luckily my first forced auto had a good ending!!
Engine was very hot afterwards. Needle nearly at 2 1/2.

Was running at 2 3/4 on the main needle on the third tank, no problem.
I'm wondering if 2 3/4 on my particular carb is more like the correct setting? How sensitive is this adjustment?

Correct me if I'm wrong....

Running too lean, engine gets hotter, less exhaust smoke, possible engine cut situation...

Running too rich, engine runs cooler, more exhaust smoke, engine can bog down, reduced power available..

Anyone have anything to add to help me fine tune correctly??

( Have left the low end needle as suggested by Carps above )

Cheers

Martin
10-05-2003 Over year old.
 
 
mbcopter
Heliman
Location: belgium (aalst)

Hi Martin,

There can be a small differance between Lotterlecarbs.
So the settings of the mainneedles can be different , also this carburator is't very sensitive!

I had the same prob as you , so i can give you a few tips:

Reduce pitch: OS FX can not mach that 11° pitch that Jan put in the manual.Reduce to 9 or 9 1/2 and your engine would not bog down anymore.
Mix swash / trottle 40%
look also your fuellines : the nipple in the hatori 700 is very close to the manifold, so the fuelline is burning easily!
Also the fueltank is very thin.

Hopes this helps,
had same probs,
regards
Marc Baillius
Belgium
10-05-2003 Over year old.
 
 
Pascal
Senior Heliman
Location: Paris, France

Martin,


What fuel are you using ? percentage of oil, nitro ?

This carburator is sensitive to the percentage of oil.

Pascal
10-05-2003 Over year old.
 
 
Mart
Heliman
Location: Wiltshire,UK

Using the Model Technics Fuel as recommended by Rev Models in the UK. First gallon is 15% oil, no nitro.( Half way through that )
then on to the 12% oil after, still no nitro.

Pitch issues. I did try the 'speed' setting as recommended and you are right it did not bog down as much as the normal 3d setting.
May be your right, I will try this next time out!
Not sure regarding your comments on the swash/throttle mixing!?
Do you mean the swash cyclic mixing? I know Jan recommends up to 20% but I havn't dialled that in yet!?

Thanks for all comments

Martin
10-05-2003 Over year old.
 
 
Pascal
Senior Heliman
Location: Paris, France

Martin,


15% is not appropriate for your carburator, this is your problem.
Although you may think it is good for the engine, it prevents it to run properly.
Last, use an Enya 4, NOT an OS8 (as this one is designed for 10% nitro and above)
As I wrote the carburator is VERY sensitive to the oil %, this is why you have the standard needle for 12%, another one for 14%, or 16%...
Believe it or not, with a top quality oil, an engine will run safely with 7% of oil and no nitro. there is an appropriate needle for the Lotterle carburator for fuel with 8% oil

Switch to a 12% oil, 0% nitro based fuel and it will run perfect. With an OS91FX-H, the maximum rotor speed is 1700rpm, and at that speed my one pulls 10.5°.

Pascal
10-05-2003 Over year old.
 
 
Mart
Heliman
Location: Wiltshire,UK

Thanks Pascal,

That all makes a lot of sense.
I've ordered some Enya 4 plugs and will now switch to the 12% fuel
and try again!!

Cheers
10-06-2003 Over year old.
 
 
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Henseleit 3DNT - Rocket - 3DMP > Need help on needle setting of my OS 91 lotterle carburater on a 3DNT
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