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HelicopterVario Sky Fox - Benzin - Evolution - Xtreme › Sky Fox - Rossi Engine - EC135
09-04-2009 11:09 AM  8 years agoPost 1
MattJen

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UK

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Hi

I wanted to know what type of fuel you use with a Rossi 75 ?

A fellow vario flyer was recommended to use pure castor oil in the first few tanks..

But i was wondering what you use after that as i hear these engines dont like high nitro fuel...

it is going into a scale application..

Matt

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09-04-2009 11:50 AM  8 years agoPost 2
Jack Martin

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AKA HeliJack, Washougal, WA

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FAI, 0%, and Castor, at least some. The Rossi loves castor and synthetic mix. Add the extra shim in the head too.

Remember our Veterans.

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09-04-2009 07:54 PM  8 years agoPost 3
payne1967

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uk

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you may find in the ec the rossi is lacking in power
if i remeber correctly the one i know of started out with the rossi and to get it to fly correctly it had an os91 fitted
but it was in the extreme mechanics not the sky fox

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09-04-2009 08:01 PM  8 years agoPost 4
MattJen

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UK

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thanks for info Payne/JACK

as the mechanics came with a rossi, i will try it first,
the sky fox EC135 is smaller and lighter than the extreme one, so it maybe ok

Hope you are well, last time we spoke one of your family was ill and you were making trips to hospital, hope all is well

Matt

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09-04-2009 08:27 PM  8 years agoPost 5
payne1967

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uk

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my mums now out of hospital (only a short 9 months stay)
she's doing ok but its hard work as she's so used to the nurses running around after her

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09-10-2009 10:59 AM  8 years agoPost 6
MattJen

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UK

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Is there an easy way to get the engine out ? i have undone the mounts, took out the Plastic shroud, but it doesn't want to come as per instructions, ie just drop out, do you need to split the frame up ?

The reason being i need to mill out the clutch bell to fit the magnets for a GV1, the holes are all ready there but they are too small, i need to make them 4.1mm i was also recommended to drill a .5mm hole inside the clutch bell to allow the araldite to drip through so it doesn't push out the magnet as it dries - good tip

Am going to order a set of carbon blades for the fenestron, as the plastic ones dont seem that efficient..

I am also gonna replace the piano wire that runs inside the boom, to the pitch slider, i am gonna get 3mm hollow carbon and expoy a 3mm avro push rod to it, i have managed to locat a fenestron tail upgrade, it is a bit pricey but is all metal and fits directly onto the rear of the vario tail box, it is the same as Darrens Ec135 upgrade idea, it sure looks as if it will do the job..

Matt

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09-10-2009 02:52 PM  8 years agoPost 7
payne1967

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uk

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you don't need to drop the engine
take the crank nut off and remove the fan
if the clutch shoe won't come off either get a vario clutch puller or make one, after the clutch shoe is removed the bell will pull off

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09-10-2009 04:12 PM  8 years agoPost 8
MattJen

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UK

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awsome, many thanks Payne,

So if you need to take the engine out i assume you can't unless you split the frames.

Thanks for the advice,

Matt

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09-10-2009 04:21 PM  8 years agoPost 9
payne1967

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uk

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my sky fox has the old type drop in frame (the mounts are on the top not the bottom like they are now)in a bell 47 once the mechanics are removed from the body (the cooling duct stays behind in the body)
its just a case of unbolting the engine mounts and dropping the engine out of the bottom

i would think all you will need to do is to remove the cooling duct and unbolt the engine mounts and drop the engine out the bottom
if there is a clearance problem with the head then you may need to take the front tray off
you may also need to slacken/remove the carb
don't lose the shims from the engine as they adjust the gear mesh

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09-10-2009 04:29 PM  8 years agoPost 10
MattJen

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UK

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thanks again,

it is not as straight forward as manual makes out, but hey, not everything is simple.

I am looking forward to flying it this weekend, as i had some time today to setup a rough pitch curve, so hopefully will get time over the weekend - well thats my aim anyway..

I have a 401 coming plus a 2.4 rx, i am gonna try it first without any stabilisation, i have flown a freya, with a vario 4 bladed head, for a hovering circuit, so i am well looking forward to it.
The fuse is just too nice to just be mantle piece ornament.

Did you have the lynx ? i know i saw a video of one flying by a mike payne, is that you ?

Matt

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09-10-2009 07:57 PM  8 years agoPost 11
payne1967

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uk

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matt i don't have a lynx
but i do know of of one that needs finishing and a benzin trainer that needs sorting out to go inside it
it may come on the market one day?

i do have one of lhc's apache's thats had a tail gearbox failure but the parts are on their way to get it going again

dave

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09-12-2009 11:40 PM  8 years agoPost 12
MattJen

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UK

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Sorry Dave

I got you confused with someone else, must be getting old!!!

Thanks for the advice, in the end i did not have to get the fan off, which was lucky as the prev builder had used red locktight on it, even heating it up woldn't remove it! the holes pre drilled were the right size for the magnets, i epoxied them in and i am getting 97% on the sensor check..

I got all the head setup tonight and cleaned out the carb as it had chunks of castor in it, the prev owner had only ever started it up once over a year ago and it was straight castor.. so after cleaning out the carb i set the idle screw and and did 2 full turns on the top end needle, as a guess for starters,I could not find any instructions for the Rossi 75, so i am guessing that 2 full turns will be enough.

I also re set the pitch range as the rods were too long, i was getting 18 degrees top end, +8 at mid and -3 at bottom..

I managed to shorten the rods and brought the range down, i am gonna run at -3 +5 +9, and in hold the top end will be +12, which with a 4 bladed head should be enough for an Auto if i ever need to..

I am tidying up the wires and i will be ready to run it up tomorrow.

I will post some better photo's tomorrow.

Thanks for the advice guys

Much appreciated.

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09-13-2009 07:56 PM  8 years agoPost 13
payne1967

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uk

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don't forget the rossi engine doesn't like nitro
hence the castor in it, as its been run on castor straight fuel

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09-13-2009 08:31 PM  8 years agoPost 14
MattJen

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UK

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yeah, thanks Dave,

I spoke to a few at Eynsford fly in, who were using Rossi engines,
they all recommended i go for the OPTI Fuel 5% and high castrol content.. so that is what i have done.

It islooking really nice, all the mechanics are now setup and i am just waiting for the carbon fene blades to come.

Matt

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09-14-2009 08:27 PM  8 years agoPost 15
sestcourt

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Berkshire, UK

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Evening Matt,

I've got an EC135 with Rossi 65, on model technics straight fuel the engine was extremely picky - either to lean or far to rich and thats just within one click of the main needle.

After reading some post's I picked up some coolpower 5% and hey presto the heli flies great now....

You'll love this machine once its gets airbourne...

Good luck with it

Steve

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09-14-2009 08:50 PM  8 years agoPost 16
MattJen

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UK

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Hello Steve

Really nice to hear from you, How was the Airwolf? moved on ?

I started it up today, and got into the hover, and it blew a plug, i am using Opti fuel 5%, and and an OS8 plug,my current settings are 2 full turns plus 5 clicks on main needle, and half a turn on idle screw.

So will try again, tomorrow, I am running the 4 bladed head with no mixers or gyros, i havent even fitted the helitronix mixer..

It is so nice to have a fenestron bog standard that works, so it goes to prove that it is the turbine version that has the problem due to the low head speed and additional weight..

this tail was moving as my F3C machine does. So i am well happy with it.

I have taken some more photos of the fuse and i will put them up later.

thanks again for posting

Matt

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HelicopterVario Sky Fox - Benzin - Evolution - Xtreme › Sky Fox - Rossi Engine - EC135
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