Discussion and info on NovaRossi R61F and R61F Speed/13
03-19-2015, 07:06 AM
#26
Thread Starter
I had to move my receiver battery pack from the LE of the wing to the TE of the wing to balance my Saturn with the R61F. The R61F weights 3 oz more than the OPS 60 I had in the Saturn before.
Ralph
Ralph
05-09-2015, 05:40 PM
#27
I'm back
I finally got to run my Speed 13 today, and as I promised I will report my findings.
To recap, I have the 10mm carb option and it is in a speed plane built around the engine. With that in mind all my testing was done with small diameter, high pitch props compared to what would be considered normal for pattern use. The engine is pumped as the 10mm carb does not draw fuel well upright with the tank way too low.
I started with a 9.5x8 and as soon as it hit the pipe I saw 19,250. I put a Zinger 10x8 on it and saw consistant 17,450 still on the rich side. Make no mistake about it, this thing is a monster.
I plan on exploring 9 to 10 pitch props in the future, but that information will be of even less value to pattern flyers.
All testing was done on my standard break in fuel. 15.5 Nitro, 22%oil @80/20, and the balance methanol. 4850' 70 degrees with little humidity.
The engine is very sensitive to pump settings, as a little too low it will lean out upstairs, and a little too high it runs so rich through the middle it will not transition. I played with pump pressure and low speed needle settings and found a decent compromise, but it is not ideal. I think the best bet for using the 10mm carb is to side mount the engine and get the tank position correct. The next plane I build for this engine I will probably fine tune the engine/tank on the bench with the engine on its side, and build a plane around that. I might even be smart enough to make enough room for more than 10oz of fuel....
As stated earlier by David, this thing is pretty sensitive to pipe size. My carbon pipes work well, but they are ear splittingly loud. I am lucky to have a flying field out in the middle of the Nevada desert with no noise restrictions. The 50400 pipe works very well, and is about as loud as a sewing machine. I highly recommend it, if you can stand an extra 1/4 pound. I am sure there is a Macs quiet pipe that will come close in performance if you are willing to try a few. The "60" sized pipes are too small through the waist and too small at the stinger as well.
For pattern use with the 9mm carb, I would probably prop it to 14k to 15k with 6 or 7 pitch to keep the speed in check. Unless the plane is a cinder block, you will never run out of power.
Scott
I finally got to run my Speed 13 today, and as I promised I will report my findings.
To recap, I have the 10mm carb option and it is in a speed plane built around the engine. With that in mind all my testing was done with small diameter, high pitch props compared to what would be considered normal for pattern use. The engine is pumped as the 10mm carb does not draw fuel well upright with the tank way too low.
I started with a 9.5x8 and as soon as it hit the pipe I saw 19,250. I put a Zinger 10x8 on it and saw consistant 17,450 still on the rich side. Make no mistake about it, this thing is a monster.
I plan on exploring 9 to 10 pitch props in the future, but that information will be of even less value to pattern flyers.
All testing was done on my standard break in fuel. 15.5 Nitro, 22%oil @80/20, and the balance methanol. 4850' 70 degrees with little humidity.
The engine is very sensitive to pump settings, as a little too low it will lean out upstairs, and a little too high it runs so rich through the middle it will not transition. I played with pump pressure and low speed needle settings and found a decent compromise, but it is not ideal. I think the best bet for using the 10mm carb is to side mount the engine and get the tank position correct. The next plane I build for this engine I will probably fine tune the engine/tank on the bench with the engine on its side, and build a plane around that. I might even be smart enough to make enough room for more than 10oz of fuel....
As stated earlier by David, this thing is pretty sensitive to pipe size. My carbon pipes work well, but they are ear splittingly loud. I am lucky to have a flying field out in the middle of the Nevada desert with no noise restrictions. The 50400 pipe works very well, and is about as loud as a sewing machine. I highly recommend it, if you can stand an extra 1/4 pound. I am sure there is a Macs quiet pipe that will come close in performance if you are willing to try a few. The "60" sized pipes are too small through the waist and too small at the stinger as well.
For pattern use with the 9mm carb, I would probably prop it to 14k to 15k with 6 or 7 pitch to keep the speed in check. Unless the plane is a cinder block, you will never run out of power.
Scott
05-10-2015, 07:37 PM
#29
No problem, I was hoping I would be of some assistance to someone.
One more thing to keep in mind with this engine. I did not measure the timing exactly, but I did do a quick check and the exhaust duration is in the 182 neighborhood. This thing is timed to run in the 17k and above range. I was not surprised when I saw over 19k with a light prop load. Leo saw 22k on an even lighter load during break in. Trying to load this engine down to 14k or less will leave a huge part of its power behind. It will still pull, but it will not make anywhere near its potential power down there.
Using a lower pitch prop to keep the rpm's up will keep the engine in its peak power band at the expense of prop noise.
I guess everyone will have to make their own choice between prop noise, rpm, and speed.
Scott
One more thing to keep in mind with this engine. I did not measure the timing exactly, but I did do a quick check and the exhaust duration is in the 182 neighborhood. This thing is timed to run in the 17k and above range. I was not surprised when I saw over 19k with a light prop load. Leo saw 22k on an even lighter load during break in. Trying to load this engine down to 14k or less will leave a huge part of its power behind. It will still pull, but it will not make anywhere near its potential power down there.
Using a lower pitch prop to keep the rpm's up will keep the engine in its peak power band at the expense of prop noise.
I guess everyone will have to make their own choice between prop noise, rpm, and speed.
Scott
05-15-2015, 09:33 PM
#30
Join Date: Dec 2002
Location: Konz, Germany, GERMANY
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OS RZ brute power
In respekt to the great Novarossi engine I use if more power is need the OS 91 RZ rear exhaust engine.
The same size and weight as a 60.
Turned on 15 % nitro, 18 % öl 11x14 APC 12 300 rpm, 12,5mm carb with perry pump,
more than enough for the old RC1 pattern ships.
Be carefull your modell can take the power.
Regards Michael
The same size and weight as a 60.
Turned on 15 % nitro, 18 % öl 11x14 APC 12 300 rpm, 12,5mm carb with perry pump,
more than enough for the old RC1 pattern ships.
Be carefull your modell can take the power.
Regards Michael
08-24-2016, 06:53 PM
#32
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Hello,
Could some post the factory carb settings for the R61F Speed/13 with 10mm carb.
Looking to set my engine back to the manufacture specs - new engine having trouble getting to run at high speed.
Best Regards
Rick
Could some post the factory carb settings for the R61F Speed/13 with 10mm carb.
Looking to set my engine back to the manufacture specs - new engine having trouble getting to run at high speed.
Best Regards
Rick
12-23-2016, 01:31 AM
#33
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Hi, does anyone know the email address of Planethobby.com or if they ship to Australia. Wanting to buy two engines off them and can't get it to say ship to Australia. One is the Novarossi R61F Speed 13. Thanks everyone
01-15-2017, 08:26 PM
#35
Here is some useful information on NovaRossi engines with regard to their use in CLASSIC PATTERN AIRPLANES:
https://www.rcgroups.com/forums/show...-13-Conversion
https://www.rcgroups.com/forums/show...-13-Conversion
Robert
https://www.rcgroups.com/forums/show...-13-Conversion
https://www.rcgroups.com/forums/show...-13-Conversion
Robert
