kwik

Hello,

Is there anyone out there that has any experience regarding this engine?

Since Affas was somewhat dissapointed regarding the power he got from the Roto 85, I wonder what the Roto 130 will be like.

I am looking for an engine that will we possible to get completely inside the cowling of a Meister scale 1/4 scale Bf-109.

If one is looking for a fourstroke, which I am, it seems one has to have each cylinder at a maximum of 40cc. Otherwise the cylinders will be too high.

An adapter up front could then push the front cylinder readwards, so that it (the front cylinder) ends up in the radiator.

kwik

I have a Valach 120cc inline twin.

It is measured to give 5000 rpm with an Engel 28x14 3 blade propeller.

It powers a 23 kg heavy model quite well.

If one look at the factory spec for the Roto 130 FSI, it says

-2 BLADE PROPELLER 28/10-29/10
-3 BLADE PROPELLER 26/10

That doesnt sound too good.......but it would be good to hear from someone that actually measured.

As mentioned, the Valach 120cc inline twin gave 5000 rpm with an Engel 28x14 3 blade propeller.

Sonny.C

My Feedback: (23)

Hi Kwik,

I too am looking at the Roto Motor engines, specifically the 85 inline, but the power rating seems really low for an 85cc engine. I was going to put the 85 in my Carf spitfire, but have since changed my mind. I didn't know Roto made a 130 cc inline.

Sonny

kwik

It is strange.....these guys says they have it in stock;

http://www.ranwanbruc.com/roto-130-fsi-p-3060.html

I wonder if this webshop is "genuine".....since here they say out of stock, and it is Roto themselves.... ;

http://www.rotomotor.cz/rotomotor/es...irplane-engine

Yes, the 85 seems quite "weak" regarding its volume. Strange.

mogman

Seems like they (http://www.ranwanbruc.com/roto-130-fsi-p-3060.html)only accept Western Union or wire transfer as payment options.
Their prices are good...almost too good to be true??......I would really like a 130FSI, but I think I'll wait and see if anyone else deals with them.

Anybody know how to check to see if they are legit?

Pelle Gris

I have been looking at the 85 FSI for a future project, but have concluded, based on the reports I have found, that it develops about the same power as a good G-62.
It would seem that both Kolm and Valach delivers a lot more power for their size, but they are also a lot more expensive than the ROTO.

BTW. A friend of mine used to own a 85 FS and and only after adding a fuel pump, like the one for the Moki radials, did it run consistently.

mogman

Vogelsang Aeroscale, who sell Kolm and Valach, advocate using an electric pump on the 4 strokes.

kwik

Are you sure about that?

Or did you want to say;
"Vogelsang Aeroscale, who sell Kolm and Valach, advocate using an electric pump on the Moki's".

I have a Valach 120 inline twin, and it runs like a clock. No pump, except the one in the Walbro itself.

mogman

You're correct, pump use on the radials.

Sorry about that.

RichardGee

My Feedback: (156)

I am currently flying a Roto 85 FSI on a Bud Nosen Gere Sport. About 25 pounds; spinning XOAR WWI 26x8 prop. I have no idea what RPM, but am EXTREMELY satisfied with the engine in every respect. It can be a bit cranky first thing in the morning at a cold flying field, but once started (always by hand), the sound is a thing of beauty. It pulls my Gere off the ground in about 2 fuselage lengths and will pull the draggy bipe straight up, if I want it to. But where the engine really shines is the sound at all throttle settings. I am currently building a 110" Lockheed Vega and will power it with the Roto 85 opposed twin - I am THAT impressed with the quality and performance of these Roto Motors. One other drawback of the inline twin is that it uses TWO ignition systems because of the opposite power strokes (vs. simultaneous power stroke on opposed twin). Just a bit more bulk, but I power them both through a SINGLE DLE (RCXL) Opto KILL using Y connectors. The fit and finish is superb. I run Red Line synthetic 44:1. Here is a video of the Gere with Roto 85 inline twin...

https://www.youtube.com/watch?v=O9WplTAp7iU

Sonny.C

My Feedback: (23)

Hi Richard,

Would you say the Roto 85 inline has a lot more power than say a DA-60/DLE-55? I know the Roto has a slightly higher rated horsepower than the DLE-55.

Man, I'd love to put one of these in my Carf Spit.

Thanks!

Sonny

Mikola

another fake site. China does not import enything made outside of country

apples to oranges. do Valach an Kolm have 85cc engines ?

Moki are not true radials like this one. 3500 EUR + VAT http://www.air-en.com/project/7-cyli...stroke-petrol/

kwik

Yes.....but I am looking for a 4 stroke that will we possible to get completely inside the cowling of a Meister scale 1/4 scale Bf-109.

And the Roto 130 FSI is the only hope I have so far.

I havent found any other 4 strokes that is low enough.

If you keep each cylinder in the 40cc area, there is hope. But then one needs 3 cylinders, I think, for it to be powerful enough.

It is a heavy warbird. 22-23 kg's or thereabouts, if I remember correctly.

But perhaps I am asking for any reviews too early, so I will wait and check for updates. Maybe I am lucky, and someone chime in,
hopefully with a positive result!

RichardGee

My Feedback: (156)

Sonny,
I would not necessarily recommend the ROTO 85 FSI for a warbird of that size and weight. One of the guys at my field has a CARF P-51 into which he installed this engine and power is just barely adequate. I DO feel he has his propped wrong for the intended model and that a little tuning would pick up 100 rpm, which combined, COULD make a noticeable difference in flight performance. But compared to a, say a DA60, no, the Roto 85 would not be comparable. However, a DA60 may not spin a XOAR 26x8 without over-heating, so I suppose its relative. The Roto is really meant for spinning a big prop at lower RPM. That said, IF a guy were to prop it with a 24x12 or even a 24x14, it might do the trick on a warbird like your Spit.

mogman

duplicate post, sorry.

mogman

So what would you call the Moki 5 and 7 cyl. engines?

Sonny.C

My Feedback: (23)

Richard, thanks for the info!


Looks like the DA60 would be a good/better match for the Spit than the 85FSI.


Thanks!

Sonny

SJN

Im looking into getting one for my CY model Hawker typhoon.......if it will fit Im 3d printing a plastic version of the engine to see if it will fit my plane without too many mods before ordering one :-)


Anyone got one since this thread started and have any new input about this engine ?

kwik

Not much happening in this thread lately.

I can tell you that I now have the Roto 130 FSI mounted in a FiberClassic Spitfire 1/4 Scale.

I get 4900 rpm with an Engel 26x14 propeller.

I have flown it properly only 2 short flights this weekend, and it seems a bit short on power. I didnt dare a loop, for example.

RichardGee

My Feedback: (156)

I continue to be extremely satisfied with the performance of my Roto 85 FSI inline twin. It pulls a big, draggy, 8 foot biplane through all the typical "barn storming" maneuvers of the 1930's and does so without over heating or any auxiliary fuel pump.
While I have no experience with the 130 FSI, it appears to be a short stroke design, which lends itself to turning props that will allow it to spin up.
IF I were looking for an appropriate inline twin for a warbird of less than 100" span, and 35 pounds or less, my choice would be the new Roto 120 FSI.
Its design seems better suited for that type of airplane and propeller combo.

SJN

4900rpm sure seems low when you look at youtube videos and what others are getting in rpm.

I just bought a second hand 85 FSI to put in a cy Hawker typhoon.

kwik

Okay ?

I wouldnt mind any links?

Here is my youtube video on the 130 FSI;



I get 4900 rpm now.

Tony Hallo

I have a Roto 85 FS, it swings a 26" X 8" scale Falcon prop at 5700 in the air and pulls a 39 pound Champ with ease. 4200 rpm to 4600 rpm in cruise, 5700 rpm while climbing.

kwik

I found a german site with some interesting stuff.

I put it through google translate:

ROTO 130 experience | RC-Network.de (www-rc--network-de.translate.goog)

(You must set languages in upper left corner)


This is the propeller Ive used so far. After reading this, I will use Falcon 26 x 12 instead, I think.;

kwik

I finally managed a flight with the Spit and the Roto 130.

Here is the flight;

The only problem I have left is that the spark-plug on the front cylinder tends to fill up with petrol and oil when running at approx 50%, and it runs on only 2 cylinders from then on.

Which of course is a HUGE problem; The cowling must off. Again. And empty the spark plug of fuel and oil.
Its a total showstopper, really. The cylinders are inverted, of course, but this is no problem in any other engines that I have.

So, if anyone knows how to get rid of this problem, please, tell ......

I have done one thing; Adjusted the gap of the inlet-valve, but dont know whether it will help yet. It was the double of the spec.

Another thing I can do, perhaps, is to invert the whole plane while adjusting the H and L needles and set especially the front cylinder as lean as possible for both H and L needle.... If I try this while the engine is inverted( plane at its wheels),, it tends to stop running in the middle of the adjustments; Spark plug is flooded.....