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Roto 130 FSI 4 stroke inline 3 cyl; Anyone got any experience?

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Roto 130 FSI 4 stroke inline 3 cyl; Anyone got any experience?

Old 11-23-2015, 02:17 PM
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kwik
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Default Roto 130 FSI 4 stroke inline 3 cyl; Anyone got any experience?

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.
Old 11-23-2015, 02:22 PM
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Default Comparing to a Valach 120cc inline twin.

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.
Old 11-23-2015, 02:32 PM
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Sonny.C
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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
Old 11-23-2015, 02:43 PM
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kwik
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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.
Old 11-26-2015, 07:32 AM
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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?

Last edited by mogman; 11-26-2015 at 08:04 AM.
Old 11-28-2015, 02:48 AM
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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.
Old 11-28-2015, 07:08 AM
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Vogelsang Aeroscale, who sell Kolm and Valach, advocate using an electric pump on the 4 strokes.
Old 11-28-2015, 10:02 AM
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Originally Posted by mogman View Post
Vogelsang Aeroscale, who sell Kolm and Valach, advocate using an electric pump on the 4 strokes.
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.
Old 11-28-2015, 01:06 PM
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You're correct, pump use on the radials.

Sorry about that.
Old 11-30-2015, 09:37 PM
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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
Old 12-01-2015, 09:15 AM
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Originally Posted by RichardGee View Post
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
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
Old 12-01-2015, 11:31 AM
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Originally Posted by kwik View Post
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.... ;
another fake site. China does not import enything made outside of country

Originally Posted by Pelle Gris View Post
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.
apples to oranges. do Valach an Kolm have 85cc engines ?

Originally Posted by mogman View Post
You're correct, pump use on the radials.
Moki are not true radials like this one. 3500 EUR + VAT http://www.air-en.com/project/7-cyli...stroke-petrol/
Old 12-01-2015, 12:14 PM
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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!
Old 12-01-2015, 03:41 PM
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Originally Posted by Sonny.C View Post
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
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.
Old 12-01-2015, 08:09 PM
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duplicate post, sorry.

Last edited by mogman; 12-02-2015 at 07:04 AM.
Old 12-01-2015, 08:10 PM
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Originally Posted by Mikola View Post
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/
So what would you call the Moki 5 and 7 cyl. engines?
Old 12-02-2015, 05:10 AM
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Sonny.C
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Richard, thanks for the info!


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


Thanks!

Sonny

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