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HomeAircraftHelicopterHIROBOHirobo Freya › Icarus .91
02-09-2018 12:35 AM  6 months agoPost 1
jig1971

rrNovice

Colorado

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I currently have two Freyas in the fleet, as well as my GPH. One of the Freyas is brand new, and I plan to use an OS 70 to power it. I'm not looking for a rocket, rather a good heli for sport and F3C flying. The second Freya was given to me last summer, and I subsequently rebuilt her this winter. I have been looking at engines, and was wondering what people think of the Rossi Icarus .91. I noticed it is a long stroke design, and I'm curious if people have had any issues with vibration, etc.

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02-10-2018 03:37 AM  6 months agoPost 2
Felino

rrApprentice

Mexico city

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The problem is that just a few Icarus engines have been sold. So very few people have used it so as to post here. If you like it then go ahead and get one. I think the quality is amazing. I would like to buy one and stuff in an OS regulated carb but since I am happy and busy with my OS regulated engines I am very lazy about tyring one.
Would be very nice if Novarossi makes this engine with a regulated carb.

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02-10-2018 06:32 PM  6 months agoPost 3
jig1971

rrNovice

Colorado

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Thanks for the input Felino. One of my questions was regarding the quality of the Rossi, and I think you answered that well. I have considered a regulated carb, and ultimately decided I just don't need it for the style of flying that I do. Besides, I have found some very good pricing on the Rossi, so I'll give it a shot.

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02-11-2018 01:43 PM  6 months agoPost 4
wjvail

rrKey Veteran

Meridian, Mississippi

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I was hoping you'd get more response on this. I'd like to try a NovaRossi but it'd be nice to have some input from others first.

To parallel what falino said, I find the OS 1.05HZ-R is nearly the perfect 90 class engine. It's tough for me to remove an engine I love just as an experiment.

Often when you are buying a helicopter engine, you are actually buying a helicopter carburetor. The engine comes with it. Further, it doesn't matter how much power the NovaRossi makes if it isn't well balanced. The OS .91SZ was a good(ish) engine that was hobbled by too much vibration.

I'm just finishing an Align 700XN build and I've installed a low time OS .91HZ-R that I wasn't using. A good engine to be sure but I can see myself trying other engines too.

"Well, Nothing bad can happen now."

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02-11-2018 02:58 PM  6 months agoPost 5
jig1971

rrNovice

Colorado

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Yep, the balance really was my main concern. My initial exposure to long strokes was the old OS .61 long stroke that was produced in the late 80's. Unbelievable power for the time, but it really could vibrate a helicopter to pieces. It appears on the website that Rossi has put a lot of thought into balancing their engines. However, it is a long stroke, and you can't change that. The OS 105, as I recall, is an over-square engine, so it should be nice and smooth. Hmmmm, what to do

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