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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Engine output with 2 stage transmission
02-04-2008 10:51 PM  10 years agoPost 1
alchemist

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Auckland,New Zealand

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I'm in the market for a 90 class 3D heli and in the absence of the Aurora, the Blitz Avro is looking good. Everyone seems to be singing its prases particulary in relation to part quality and after sales support.

The Avro has a 2 stage transmission isolating the heli from the engine via a main transmission belt. In terms of isolating the engine vibration I understand it works amazingly, I've heard reports and seen videos which show the fuel in the tank looking like a "milk pond".

I've also heard that in previous years heli manufactures used this technique (2 stage transmission) but had stopped as it added extra load on the transmission. Hence in the quest for 3D power most manufactures had reverted back to a more direct transmission solution.

I have watch the videos at http://www.fly3dx.com of Dave Fisher flying the Avro, the 3D demonstration I don't think really shows its full potiental? Is there any other 3D footage available on the Avro?

Should I consider a 2 stage belt transmission for 3D?

Do you have any information on the Blitz Avro first hand in relation power output (generally speaking)?

Cheers

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02-05-2008 03:22 AM  10 years agoPost 2
mopardan

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Wantagh N.Y. USA

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Futura
It looks close to a Futura / Nova set up.

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02-05-2008 08:52 AM  10 years agoPost 3
alchemist

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Auckland,New Zealand

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I don't know much about that heli, is that a good thing? Whats the power like on it?

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02-05-2008 10:47 AM  10 years agoPost 4
Paul Woodcock

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Dubai - United Arab Emirates

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Hi

I have read the report about the Avro in the UK heli mag. It seems good. BUT.....I would not buy one yet!!!!

It has not been round long enought to prove itself, its long term reliability, its parts availability etc, etc.

Even if it is great in all departments, it may still never 'take off'.....it is a British machine and if it never gains popularity in the US, it will probably fade away in time.

Sticking with the main stream is always the best way. Being on the for front of technoligy while you are paying the bills gets expensive and is not always worth your while.

Just my 2c about ALL new machines.

Regards
Paul

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02-05-2008 10:58 AM  10 years agoPost 5
alchemist

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Auckland,New Zealand

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Sticking with the main stream is always the best way
Wise words.

Do you know any specifics about the main belt drive? Does it have much impact on power output?

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02-05-2008 12:39 PM  10 years agoPost 6
Jafa

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Sydney, Australia

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I've heard reports and seen videos which show the fuel in the tank looking like a "milk pond".
All my heli's have the fuel looking like a dead calm lake at sunrise

Just dial indicate the clutch stack

Besides - that is not an attribute that would sway me on a top end heli that I am contemplating beating on with hard 3D

I would imagine that the drive train soaks up a bit of power - that would concern me far more

Look at the TRex600N - JK designed the fan to minimize power wasted pushing air


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

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02-05-2008 12:57 PM  10 years agoPost 7
Joe90

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Quebec, Canada

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I think that the belt is taking about 3% power. In the overall figure it is not such a big factor. The choice of blades can have more influence than this.

To me, by looking at this machine, I think that the designer wanted a silent, precise flying, and sturdy machine. More suited to F3C style of flying with lot of hours behind the stick without major maintenance.

But I dont know him, this is my feeling whan I look at his design.

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02-05-2008 02:48 PM  10 years agoPost 8
Dr Lodge

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Guildford, Surrey - UK

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3D footage
Check this thread http://runryder.com/t403989p1/

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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02-05-2008 02:56 PM  10 years agoPost 9
hootowl

rrProfessor

Garnet Valley, Pa.

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What's the average all up weight?

Wolves don't lose sleep over the opinions of sheep

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02-05-2008 06:31 PM  10 years agoPost 10
alchemist

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Auckland,New Zealand

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Jafa
Besides - that is not an attribute that would sway me on a top end heli that I am contemplating beating on with hard 3D
Absolutely, I was just trying to imply that it's well made, but I agree with you totally, the lose in power from the drive train is more of a concern.

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02-05-2008 06:37 PM  10 years agoPost 11
alchemist

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Auckland,New Zealand

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Joe90
I think that the belt is taking about 3% power
Is that a general statement for any heli with a 2 stage belt transmission or for the Avro only?

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02-05-2008 10:17 PM  10 years agoPost 12
Jafa

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Sydney, Australia

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It's likely to be more than 3%
Why do so many American pilots insist on a torque tube tail drive
to get reduced drag during autos???


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

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02-05-2008 10:21 PM  10 years agoPost 13
RAK402

rrElite Veteran

Alhambra, CA

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The Blitz looks really cool, with a lot of attention to detail.

I am actually a little leary of the belts in that specific application.

I can still remember installing a new belt on the Kavan Jet Ranger, years ago, and hearing this interesting sound that was somewhere between a machine gun going off, and a bicycle with cards in the spokes.

It was, of course, the sound of teeth being shucked off of the brand new belt...

I have never had a problem with tail belts, and no problem with the little main drive belts on the Cricket (.28 sized motor).

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02-06-2008 12:47 AM  10 years agoPost 14
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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When you get into the two stage belt drive you get a smooth flight mostly for FAI for hard 3d you get a backlash from tension on belts so flight can be inconsistent. Tail belt drive 90 helis like Avant EFX flies smooth but when I hammer down it seems to tail kick every now and then . I have a caliber 90 and it too flies smooth and quiet I do not hammer this machine but maybe one day

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02-06-2008 09:30 AM  10 years agoPost 15
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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I wouldn't be to concerned about the additional loss from a two stage transmission since I can't image its that large. I think the bigger issue is for stick bangers as belts are going to "give" and for hard 3D some inconsistency may result as Jeff says. However that could be an incentive to fly more smoothly

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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02-06-2008 11:12 AM  10 years agoPost 16
alchemist

rrVeteran

Auckland,New Zealand

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Thanks, this feedback is really helpful.

It's interesting that the Avro is marketed as both FAI and 3D.

I'd still really like to see someone spank the Avro "Szabo Styles" to see what it's capable of.

With the slight lose in power and belt tension issues, I think generally speaking main drive belts are unsuitable for 3D machines (if you're looking for that edge).

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