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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › new webra 55
05-08-2005 10:58 PM  13 years agoPost 81
Geo

rrApprentice

Australia

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Jimmy
Just wrapping copper round the head is not good
You have to get the water closer to the combustion chamber
That is the part you want to cool
Aly transfers heat fairly slow , so you can end up with an overheated combustion chamber and a cool head on the outside
Not good
Geo

Self confessed Inverted Auto failure

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05-08-2005 11:15 PM  13 years agoPost 82
Hendrix

rrNovice

Piraeus Greece

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I know.
I am just trying to fool my self that maybe there is an easier way.
I sent an email to Webra asking for help as i am willing to pay something for a marine head.
Who knows i (we) might get lucky.
I am also searching for a good machining shop in UK for the job.
I think UK has the best machining places in Europe.
Chris

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05-09-2005 12:03 AM  13 years agoPost 83
Geo

rrApprentice

Australia

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Hendrix
Greece sounds like the most exotic place on Earth
Eternal Summer time
And cool water
Whats the flying field like ?
Geo

Self confessed Inverted Auto failure

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05-09-2005 01:30 AM  13 years agoPost 84
Hendrix

rrNovice

Piraeus Greece

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It is a nice place alright.
Rocky and green with endless beaches and mild climate.
Just dont ask for anything high tec.
The flying field is near the sea( in fact i have jumped already in the water in order to save a plane, which i did)
for as long it is available as they tend to cover every inch of free space with concrete here.
We also fly at the deserted now former international airport inside Athens.
The authorities let us fly there as there is nothing real flying in or out of this airport.
The residents there find it good also because many vultures want to put their hands on this vast space and sell it.
There at least we have a runway of 9800 feet for our model airplanes
(For as long as it lasts)
If you have flight simulator up to 2004 edition you can fly in this airport.
It is called "Ellinikon"
Funny ha we fly rc models there were Boing 747 use to land and take off.
I guess not many people can enjoy this site.
Chris

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05-09-2005 10:49 AM  13 years agoPost 85
Hendrix

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Piraeus Greece

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I finaly found a way to make a watercooled jacket.
Not quite a jacket but it will do i think.
I will use 2mm coper tube which fits exactly in the heads fins.
Actualy i will use 8 pieces of this tube connected at the ends with a 3mm coper tube.
All 8 pieces will run in parallel so the efective diameter will be 8mm since those
pieces will be soldered in the 3mm tubes.
Something like


.................... | --------------------------- inlet
.closed end | --||--||--||--||--------------
.........................||...||...||...||
.........................||...||...||...||
.........................||...||...||...||
.....................| --||--||--||--||---------------
.closed end | ---------------------------- outlet

Chris

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05-11-2005 02:23 AM  13 years agoPost 86
Akio Miyata

rrNovice

Rondonópolis-Brasil

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Is this motor better than the THE 50 SX-H hyper??

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05-11-2005 03:57 AM  13 years agoPost 87
Geo

rrApprentice

Australia

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Akio
Well the way Webra does their cranks and the balance factor they use
That would be better than the OS
I dont think any one has used the 55 long enough to know
I would be wary of the ABN P/L as its easy to get the differential expansion wrong as witnessed by some other engines

Geo

Self confessed Inverted Auto failure

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05-11-2005 09:14 PM  13 years agoPost 88
thierry

rrApprentice

Paris FRANCE

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power of webra 55 is really awesome

hover at less than 40% carburator opening
with a rotor speed well above 2100 rpm
even at 9 ° pitch , rotor speed is above 2000 rpm

in flight , feeling is much power than my OS 50 hyper

in both case i use only 10 % nitro fuel
but it is enough with the webra 55

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05-11-2005 10:15 PM  13 years agoPost 89
Windspiel

rrVeteran

Massachusetts

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Does anybody know if the exhaust port bolt holes is the same as OS
the 52AAR was wider limiting the option in exhaust systems

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05-11-2005 10:49 PM  13 years agoPost 90
bigbuster

rrApprentice

APO 09021 NY

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Bolt holes
The 55 and 52 are the same. I just checked them at the lhs.

Jeff

I'm hooked.......

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05-13-2005 07:16 PM  13 years agoPost 91
Hendrix

rrNovice

Piraeus Greece

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hover at less than 40% carburator opening
I guess that the wooden blades are out of the question or you can
lower the throttle opening to get ~1700 rpm?
With the R50V2 i bought 2 sets of woodies, just in case i crash, a thing
which never happened so far so i hate to let the woodies rotten and move to carbon blades.
Another question i have is if the engine running smoothly enough
so i can lower the RPM?
As you might know i plan to use only 0% nitro (straight fuel)
so i guess power will be somewhat lower.
Thats what i fly for now since i am still learning.
I can fly anyway i like but i always take things easy, one step
at a time, especialy when i change the helicopter type until i learn
its peculiarities. That way i almost never crash and i advance more rapidly than
i thought because i repeat the same moves many times
and at the same time i am having fun and not too much stress.
Besides is the journey that counts.
If i finaly master (i mean fly well not become a super pilot)
the rc helicopter flying on that type i guess i will not have much fun
as before.
Chris

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05-13-2005 07:36 PM  13 years agoPost 92
sharam

rrElite Veteran

Northern California - Fly at Morgan Hill Field

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Windspiel,

I had to drill out the holes of an MPII to fit the Webra 55.

So far so good. I am still breaking in the engine. MPII has stayed on and performing well.

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05-14-2005 11:17 AM  13 years agoPost 93
Akio Miyata

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Rondonópolis-Brasil

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Is anybody using in the Raptor??
Did its have some problem for installing??

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05-14-2005 11:45 AM  13 years agoPost 94
Jafa

rrElite Veteran

Sydney, Australia

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hover at less than 40% carburator opening
with a rotor speed well above 2100 rpm
Thats quite common on a well tuned 50, especially with a tuned pipe

We have Sceadu's with OS50 Hyper that we can't fly in idle up without the aid of a governer. All our OS50's are hovering at around 40% throttle (even on just a standard muffler)

The difference in specified power between the Webra 52, 55 and the OS 50 is very small

The Webra exhaust holes are 3mm wider than the OS

Akio - the Webra should easily fit into you Raptor without any modifications needed


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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05-14-2005 11:47 AM  13 years agoPost 95
nivlek

rrProfessor

Norfolk England

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The Weston UK pipes for their own 50 should fit as they use a Webra crankcase .

At the end of the day , it gets dark .

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05-18-2005 04:52 PM  13 years agoPost 96
Hendrix

rrNovice

Piraeus Greece

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Well here is my initial impression of the Webra 55.
It isn't broken in yet but it is getting better.
It has more power than the standard TT50H PRO even out of the box.
I didn't make anything fancy just hover as the motor has only one tank of fuel.
Unfortunately i have to work also
It is very smooth in idle but the starter has a difficult time trying to
start the engine. One out of 3~4 times i try to start it the motor wont even turn and no it is not hydrolocked.
The Funtech muffler is quiet but if i had the knowledge i have now i would leave the stock TT 50 size muffler on, but unfortunately it wont fit on the Webra without modification..
The fan with the 10 blades (RCmarket) is a must. It realy works far better than the stock fan.
I can feel the air rushing down fast even at idle.
One thing about it is that if you install the fan you need to add a 3mm washer between the motor and the fan and the other is that if you want to
remove the fan from the motor later i am afraid you will have a hard time.
The fan is not screwed in but it has a conical mount.
Anyway everything looks promishing.
I got the water cooler and the pump installed and now i am going
for the final task which is the water jacket.

Chris

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05-18-2005 05:03 PM  13 years agoPost 97
nivlek

rrProfessor

Norfolk England

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I fitted my fan HT fan yesterday and also found that I needed a spacer on my OS 50SXH . I ended up with a 2.5mm spacer .

At the end of the day , it gets dark .

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05-18-2005 08:55 PM  13 years agoPost 98
Hendrix

rrNovice

Piraeus Greece

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Nivlec this Webra 55 is a killer motor.
I have never seen such an easy to adjust and smooth running motor.
I hope its reliability is good also as i never had a ABN motor.
I fitted the perry pump for fuel and the motor actualy said
"Thank you very much" to me. It works fantastic and i am very tired now but
also very pleased.
Chris

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05-18-2005 09:20 PM  13 years agoPost 99
nivlek

rrProfessor

Norfolk England

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remove the fan from the motor later i am afraid you will have a hard time.
You're not kidding there mate . I put the fan on the engine with no spacer , I didn't have the rest of the heli with me at the time and assumed that it wouldn't require a spacer . It was a bitch to get the fan off again . I'm glad that you like the Webra . If I don't manage to get the OS running well on straight fuel then I'll probably be getting one myself , but with the head shim removed I'm pretty confident that the OS will be fine ( especially with the ten bladed fan ) .

At the end of the day , it gets dark .

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05-25-2005 12:13 AM  13 years agoPost 100
sharam

rrElite Veteran

Northern California - Fly at Morgan Hill Field

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Does anyone know at what engine RPM the Webra 55 delivers its most horsepower?

Thx.

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › new webra 55
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