Engine and fuel

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Sbrown5925 Sbrown5925's icon
 2008-01-26 23:42:38
I have a the latest 50 released for use in 50 size helis. This being the Novarossi 50.
I have fitted this to our previously retired Raptor 50 V2. After dusting this heli off from the attic, I have removed the OS Hyper which needed a new rear baring again.

I have had a few slight issues during the fitting process but am now ready to crank it up and start working with this new engine. Hopefully tomorrow will see good enough weather to start running the engine in and getting an initial setup.

I will report back on my findings. I am told that this engine does require many gallons to run it in, which is very much inline with the West 50H engine that I have in all my Align 600n helis.

This Novarossi sure it a big chunky engine. I look forward to seeing how consistant it is and how the power compares to the ever popular OS50hyper.

Si smilie

Alvin Alvin's icon
 2008-01-27 00:06:01
those engines almost last forever.both the rossi and the nova rossi engines are generally good engines.abc jobbies
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Sbrown5925 Sbrown5925's icon
 2008-01-27 00:31:48
I used to fly novarossi 50 engines many years back. They had various issues. Overall consistency was ok but they were picky to setup, tended to be rather rougher than other engines, but with the positive of power.

We had to modify the bottom needle because you could almost never throttle from tickover. This new version looks very similar and has clearly been modified to fit the modern 50 machines.
They have made a new adaptor plate for the exhaust. This takes their unique 3 bolt mouting system and converts to a standard Zimmerman style two bolt mount.

I am not sure what changes have been made to carbaration, porting and technicals of the piston, liner etc. But having used nova rossi 50's for many years, and being able to remember them well, this will be very interesting to compare.

It was not a perfect drop fit in my raptor. I have considered this carefully and for some time, and could not see ways round the two slight mods I had to make.
One being, cutting some of the side frame away to allow for the carb control to operate correctly and the second being that I had to take a bit off the engine mount to get the clutch and clutch bell to line up correctly.

So all done and charged for initial runs.
Si smilie

Phil Phil's icon
 2008-01-27 16:31:19
NOVAROSSI Engines - 8,3cc - Helicopter - C50H2
Displacement 8,29cc
Max. power 2,20 hp R.P.M (Max. power) 18.000 rpm
Practical range 2.000 ~ 21.600 rpm
Bore x stroke 21,94mm x 21,94mm
N. Transfer ports 4
.Rear Ball Bearing----------------
Balls type Steel
Crankshaft Type 16mm - 1/4" x 28
Carburettor --------------
Type 8,5mm - Rotary
Material / Aluminium
Adjustment Single
Glowplug type - Code STANDARD - C6S

Crankcase: The crankcase is made from high grade aluminium alloy and therefore it is extremely strong and durable.

Sleeve: The sleeve has 4 transfer ports, it is optimized for the rc helicopter and it is made from hard-chromed brass (true ABC construction).
Carburettor: The carburettor is a rotary throttle valve type and has a 8.5mm venturi
The engine mount of this engine is specially made for Raptor helicopters !


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Sbrown5925 Sbrown5925's icon
 2008-01-27 16:58:50
Well what can we say about this Novarossi so far?
It ran smooth as silk, never missed a beat and honked big time. Look out for a couple of video clips of it flying today. Only had 6 tanks through it so far but my god, it is looking good.

Si smilie

Alvin Alvin's icon
 2008-01-27 18:34:33
that is just what i wanted to hear! i just might get one of these engines.is it likely to fit in to a fury though.
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Sbrown5925 Sbrown5925's icon
 2008-01-27 19:16:02
We managed to grab a few basic vid shots of the Novarossi today. I have not done a mega job on these, but they at least give you the tone of the engine in its very early stages.
It was fairly breezy at the field and the Raptor came straight from a long stay in the attic with no tweaking. All the same we were pleased.

In the video vault there the first is the intial hovers in the garden, running rich with great promise. Another clip shows Mattyboy doing a bit of flying around and then a few flights later we decided to get it moving.

When running an engine in, we feel it is best to run them rich and not over load it. Personally I was gob smacked to find i could not load it, even at this stage, with a muffler and running rich. We all felt that the engine was superbly smooth.
We compared the audable tone of an OS with the exact same zimmerman muffler. The Novarossi had a smoother duller more pleasant tone yet showed a large power level compared to a ran in OS hyper.

Check out the initial vids.
Oh, cool power 30% and Enya 3 is used on this initial days test flying.

Alvin Alvin's icon
 2008-01-27 19:18:17
whats it like compared to the west
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Sbrown5925 Sbrown5925's icon
 2008-01-27 22:15:03
How does it compare?
Well so far things are looking rather good.
Lets talk about how it compared to the OS today.. Blew it away.

On the very first flight I could tell that this engine was VERY powerful. I had the same pitch setup as per the OS hyper before it was removed. As I would ease the throttle up, the engine would rev as if there was no work for it to do. Impressive seeing as the engine was set very rich indeed and running on a zimmerman muffler.
At the field the engine got some more gentle hovering about and circuits but it became clear that it was time to see how it ran inverted. As in, does it flood richer or go leaner. Does it flood rich on climbs or dives.
No to all of those. I left it as rich as the initial flight but simply flew it through some aerobatics.
The raptor that it is now in has been transformed from a dull machine to an exciting power house.
I would say that my wests have more power at this stage, but lets take into account that the wests are ran in, leaned to a good setting and have tuned pipes on them.
Where as the Nova rossi remains rich, with a muffler and tight.

But tell you what, that Nova rosse ain't much short of the fully ran in west. It turned a few heads at the field today for sure. And the tone of the engine compared to the west was great. A real smooth soft tone. We did a back to back with another Raptor with OS hyper on the exact same pipe, against the Nova rossi combo. The nova rossi has a much smoother quieter tone and the OS back bearings was fine.

So it's looking good so far. But things can change as an engine runs in and this will take a few more flying sessions to achieve.

Oh and the old Nova rossi 50 engines suffered from a poor bottom needle shape which ment that throttling from tick over usually resulted in the engine cutting. The mod was to modify the bottom jet. With this new engine there is no such issue so far. Carbaration appears to be well balanced throughout.