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Post  MauricioB on Mon Jul 01, 2019 1:22 am

Hello Friends, I recently purchased an O.S. 56 Alfa RC 4-stroke. It is certainly very beautiful and has very good features to take advantage of.
I will be modifying one of my electric models to place this engine.
I take this opportunity to share this experience with you.
I hope you like it, greetings, Mauricio Very Happy
Engine: O.S. 56 Alfa r / c
Propeller: 13 x 6 Master
Lubricant: Klotz 20%
Nitromethane: 6%
Rest: Methanol

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Post  1/2A Nut on Mon Jul 01, 2019 3:54 am

Nice 10,290 rpm peak 13x6
137.2oz - 8.6lbs thrust / 1.344hp - 1,003w / 58.4 mph pitch speed
 Thumbs Up

I have this engine too it is used on my out rigger hydro design.
The engine starts easy and I have used up to 50% nitro with it
thus far. I did not like the all blue rocker cover so modified it
with bare aluminum on the side for bit better cooling effect.



Published on Jul 30, 2017
With the first engine break in rich run completed the 2nd test on a different weekend I leaned
up the NV some and put on a bigger prop went from a 2.6" total pitch 1st vid to a 3.42" total
pitch today. Very hot test day 106F ! Best peak on the bench to a solid 14,867 rpm but backed
off to play it safe just way too hot out all the same the engine did well with no water cooling.
Best pass was 13,564 rpm / 41 mph. 4 strokes make a ton of torque I have just begun to tap into
the potential power still far off the right size prop. The engine cooled down after a few passes
average reading out of 14 rpm checks 13.4k the engine is about 4 to 5 clicks off from peak.
I should be able to launch safely at 15.2k rpm next vid with a 3.75" total pitch prop. ABC S-20
3ft rigger 18" stance / 3.14 lbs, 19% oil 45% nitro
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Post  getback on Mon Jul 01, 2019 9:14 am

Nice engine Mauricio , Has a very low steady ideal 2800 if i was reading that right Very Happy That should pull a pretty big ship with a 13x6 prop 1 Happy for you friend enjoy the new engine . Thumbs Up
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Post  MauricioB on Tue Jul 02, 2019 11:41 pm

Oh, my friends Eric and Brad, thanks for leaving your comments !!
Brad thank you for that beautiful video, it's really beautiful how your machine works in that lake, by the way, it's a lake, lagoon ?, you could tell me the name of that place, I'd like to place it in the Google earth: -) ...
Eric, the engine is wonderful, it regulates below 2000 rpm, it has a beautiful sound to my ears, I enjoy having a good beer while he is there marching ... I will be sharing the progress of my project with you.
Thanks for being there! 4th of July Flag   Smile Beer Cheers
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Post  MauricioB on Wed Jul 03, 2019 12:01 am

my friends, as I said at the beginning, I have an Extra 260 with electric motor, the truth is, I like the engines to explosions, so I decided to transform that electric motorization into glow.
Here I am sharing photos of the process:
I like my Cox, but it's small for this model ... Very Happy
This is a picture ... because I like these engines ... Clapping
O.S. 56 Alfa 4T RC 20190626
I'm just playing...
O.S. 56 Alfa 4T RC 20190628
So here I present the candidate: O.S. .56 4T...
O.S. 56 Alfa 4T RC 20190629
Here is my Extra model with its electric motor...
O.S. 56 Alfa 4T RC 20190627
I start with the reinstallation work...
O.S. 56 Alfa 4T RC 20190630
O.S. 56 Alfa 4T RC 20190631
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Post  MauricioB on Wed Jul 03, 2019 12:08 am

I start to present the engine and make adjustments ...
O.S. 56 Alfa 4T RC 20190632
O.S. 56 Alfa 4T RC 20190633
O.S. 56 Alfa 4T RC 20190634
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Post  getback on Wed Jul 03, 2019 12:47 am

The Extra 260  O.S. 56 Alfa 4T RC Extra-10
COOL !!!
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Post  balogh on Wed Jul 03, 2019 2:46 am

Mauricio the OS Max 56 FS alpha is a magnificient engine. I have 2, one powering  my Denight 50 plane, which was designed for a size larger engine,but the OS Max 56 FS pulls it with fantastic authority:

O.S. 56 Alfa 4T RC Denigh10

Here is a vid I shot with the on-board key chain camera a few years ago.



Not much is seen other than the tip of the wing and a bit noisy, but shows that the engine easily allows loops and wing-overs, spins etc. for this plane.

O.S. 56 Alfa 4T RC 20140510


I burn in it my home blended fuel with 20% castor and 20% nitro - the same as the fuel in my COX engines - and the experience is that the castor actually starts burning in this high compression/hot engine, leaving a black goo. But I do not want to run it with synt oil...the engine manual also says some castor, up to 18%, or at least a mixture of castor and synt is good to have in the fuel.

I remember having posted somewhere on CEF my youtube vid on the  garage run of my OS Max FS 56 alpha engine that peaked at about 10 500 rpm with an APC prop.

Another plane of mine where my 2nd OS Max 56 FS serves is the ACRO WOT, pictured here by the side of the Denight 50, a very sportive plane, similar in its design to the Extra 260 , so Mauricio get ready for a beautiful flight experience with this combo of yours.

O.S. 56 Alfa 4T RC 20140710

O.S. 56 Alfa 4T RC 20140610
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Post  MauricioB on Sat Aug 03, 2019 12:12 pm

Hello my friends! ... first of all I want to thank Andras Balog for his contribution in this thread and at the same time personally thank him for worrying about my absence.
I have been busy in these last days with personal matters but that are not of concern, I am already resuming my participation in the forum.
I also want to thank Brad for his message ..... I then share with you the progress and results of this project. Very Happy
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Post  MauricioB on Sat Aug 03, 2019 12:17 pm

Here you can see, as was changing the structure of the original model, to securely hold the OS .56 4T Alfa:

O.S. 56 Alfa 4T RC 20190710
O.S. 56 Alfa 4T RC 20190711
O.S. 56 Alfa 4T RC 20190712
O.S. 56 Alfa 4T RC 20190713
O.S. 56 Alfa 4T RC Img-2048
O.S. 56 Alfa 4T RC Img-2049
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Post  balogh on Sat Aug 03, 2019 12:59 pm

Mauricio make sure you either tighten the nuts of the exhaust silencer very well or, in addition, also wrap the plumber's silicon tape on the threads of the black threaded pipe between the engine and the sliencer, because otherwise you may have an exhaust leaking the spent castor that will cake on the silencer and will be very difficult to remove. ( The aluminum engine head and aluminum silencer undergo larger thermal expansion than the black steel connector pipe so the threads can leak) This engine, especially if running in a cowl, can be very hot. The area of hot air outlet of  the cowl should be at least 2.5 times the inlet area for good cooling.

The plastic motor mount in my planes is rather soft for the OS Max 56 FS and tends to vibrate so apply safety washers and/or counter nuts on the mounting bolts to prevent the engine from vibrating loose.

The engine head is rather soft aluminum so be cautios when removing and replacing the glow plug.

Just some of my experience with this otherwise excellent engine
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Post  MauricioB on Sat Aug 03, 2019 2:30 pm

balogh wrote:Mauricio make sure you either tighten the nuts of the exhaust silencer very well or, in addition, also wrap the plumber's silicon tape on the threads of the black threaded pipe between the engine and the sliencer, because otherwise you may have an exhaust leaking the spent castor that will cake on the silencer and will be very difficult to remove. ( The aluminum engine head and aluminum silencer undergo larger thermal expansion than the black steel connector pipe so the threads can leak) This engine, especially if running in a cowl, can be very hot. The area of hot air outlet of  the cowl should be at least 2.5 times the inlet area for good cooling.

The plastic motor mount in my planes is rather soft for the OS Max 56 FS and tends to vibrate so apply safety washers and/or counter nuts on the mounting bolts to prevent the engine from vibrating loose.

The engine head is rather soft aluminum so be cautios when removing and replacing the glow plug.

Just some of my experience with this otherwise excellent engine

Thanks for all your advice friend!
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Post  MauricioB on Sat Aug 03, 2019 2:34 pm

Well ... here is the inaugural flight!
I am surprised by the low vibrations of the engine.
Fly very noble, do not have to adjust gravity, or touch trim settings, everything is perfect.
A model that I will undoubtedly enjoy a lot as I adapt to it.
O.S. 56 Alfa 4T RC 20190714
O.S. 56 Alfa 4T RC Img-2050
O.S. 56 Alfa 4T RC Img-2051

Go video:
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Post  balogh on Sat Aug 03, 2019 4:11 pm

Congrats Mauricio for another great maiden flight...in my experience flying such a bigger plane like yours i.e. my Denight 50 is a different side of the hobby than the COX RC birds...not better or worse just different..the large planes are much more predictable in flight, let alone better visible, and allow me to land with the engine still idling which is a great fun. (I always have to land with my COX planes dead stick in order not to break the prop on the rough "runway" i.e. an unkempt meadow with tall grass that I am confined to fly)

Have lasting fun with that OS Max engine and the Extra
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Post  MauricioB on Thu Sep 05, 2019 7:47 am

Oh my friends, I made a serious mistake ...
A while ago I put together my Extra 260 with the O.S. .56 Alpha, it was really flying wonders, but shortly after flying it, I had a problem, I lost a transmission signal. Well, this is because I was using an unsuitable Reseptor, that is, this reseptor is not FULL range and therefore at a certain distance and height loses range.
The model was in the landing stage, it was 118 meters from my piloting point and about 4 meters high, approaching the track, I entered Fail Safe and the model ran out of signal.
What was destroyed was the fuselage, leaving stabilizer wings and steering wheel totally healthy.
I regret the loss of this model, as it flew wonders. It is also a discontinued model (**) so, I am evaluating what to do as a project, but I also have an O.S. .20 4T, which seduces me to use it.
This is the first time that I use a 4T glow engine and the truth is its march is wonderful, it is a charm that catches ..... I will see how the story goes ...

(**)
https://hobbyking.com/es_es/extra-260-1372mm-40e-class-3d-scale-arf.html?___store=es_es
Sad Sad
O.S. 56 Alfa 4T RC 20190810
O.S. 56 Alfa 4T RC 20190811
O.S. 56 Alfa 4T RC 20190812

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Post  balogh on Thu Sep 05, 2019 7:57 am

Mauricio,

this is really sad...I also crashed planes because of lost radio signal..I suspect the short antennae of your receiver are for park flyer planes with short range reception, whereas you are tempted to fly a large plane like yours and mine to further distances because we only judge by the visibility of the plane...even though 118m does not seem to be too far...or some radio interference may also have caused the havaria.

Anyway even if this plane is no longer manufactured there are a bunch of planes for the OS56...look at my yellow Acro powered by the OS56 FS alpha, in front of another extinct bird of mine, the Denight 50 (also powered by OS56FS alpha). The Acro is similar to yours and is still available.


:O.S. 56 Alfa 4T RC 20140711
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Post  MauricioB on Thu Sep 05, 2019 8:02 am

place of signal loss
distance: 118 meters
approximate height: 4 meters
O.S. 56 Alfa 4T RC 20190813
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Post  MauricioB on Thu Sep 05, 2019 8:13 am

Thank you dear friend, it really is as you say, probably if I had come down closer this would not have happened.
These RX are not suitable for distance and low altitude, if you are at the same distance but higher, the signal is still standing, I made many inquiries and I could determine that this rx can lose signal at low height from 60/70 meters away So I will not use them for this type of aircraft.
My country, again my country, is going through a difficult economic moment, our money is devalued considerably, so it becomes very complicated to buy and bring a model here, it becomes an important cost. Anyway, there are some possibilities, but nothing yet that you get here at a reasonable price.
I'm visualizing some outerzone planes, to see if I adapt any model to my O.S. .20 4T that I recently launched, and is another tempting wonder to enjoy .... I will be sharing my decisions and projects.
I love Cox engines, especially the Tee Dee .020, but the 4Time line is lovely and I would like to fly one of those engines again to make me want to, since I can't enjoy my Extra.
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Post  MauricioB on Thu Sep 05, 2019 8:18 am

András:
Could you pass me the Acro sales link, I could take it into account when evaluating the cost and if possible bring it here.
Thank you Thumbs Up
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Post  MauricioB on Thu Sep 05, 2019 8:22 am

I have some questions that maybe someone can answer:
And seen that many beautiful models like the Extra, have been discontinued and this in different brands, does anyone know the reason?
It is strange that models so good in quality and performance stop being manufactured, will it be that the world consumption of models is going down ?? Huh...
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Post  balogh on Thu Sep 05, 2019 8:49 am

MauricioB wrote:András:
Could you pass me the Acro sales link, I could take it into account when evaluating the cost and if possible bring it here.
Thank you Thumbs Up

Mauricio,

The name of the plane is ACRO Wot MK2 ARF, here is a link to it, you may find it in your local hobbyshops:
http://www.ripmax.com/Item.aspx?ItemID=A-CF006&Search=A-CF006


here is a similar model from ebay that is sold for the OS56 FS size engine:

https://www.ebay.com/itm/Phoenix-Model-Strega-Mk2-46-55-GP-EP-ARF-55-5-PH121/291340926909?epid=1637204815&hash=item43d545bfbd:g:jt0AAOSwPSxbYwBV

Good luck!
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Post  1/2A Nut on Thu Sep 05, 2019 11:00 am

Sorry for your loss Mauricio Sad  

I have seen many folks repair their planes, it is 80% complete Very Happy
Internally it may not be pretty with all the repair area's but on the outside at 2 meters
away it will look just fine. Best wishes.

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Post  MauricioB on Thu Sep 05, 2019 12:51 pm

1/2A Nut wrote:Sorry for your loss Mauricio Sad  

I have seen many folks repair their planes, it is 80% complete Very Happy
Internally it may not be pretty with all the repair area's but on the outside at 2 meters
away it will look just fine. Best wishes.

RC Plane

Hello friend, thank you !!! .... they are things that happen .... too bad I did not enjoy it for a long time, just two flights and left! ...
It's like you say, 80% is intact, since it was at low altitude and with an idling engine, maybe one day I made a fuselage ... but I don't really want to get to work hahaha.... lol!
O.S. 56 Alfa 4T RC Img-2055

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Post  1/2A Nut on Thu Sep 05, 2019 2:31 pm

Yes just bag up the parts to keep the dust off them and one day you can
revisit the project after time has passed if willing. Old Bugger

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Post  rsv1cox on Thu Sep 05, 2019 3:26 pm

I'm neither the craftsman or perfectionist that you are Mauricio but that would be red meat and a challenge for me. I would love to restore it and fly it again.

Such a beautiful airplane gone way to early.

Bob
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