RE: Extreme Flight RC Yak 54 - 74 inch!  
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RE: Extreme Flight RC Yak 54 - 74 inch! - 7/14/2006 5:52:59 AM   
tIANci



Posts: 8115
Joined: 1/15/2004
From: Kuala Lumpur, MALAYSIA
Status: offline 		Here is what the both planes look like side by side ... have to start working on mine. The EP conversion for the 74" is a real temptation, especially when I have access to Flight Power. Any comments on using an AXI 5330 running on 9S?

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RE: Extreme Flight RC Yak 54 - 74 inch! - 7/14/2006 1:03:51 PM   
AsM



Posts: 282
Joined: 3/24/2003
From: Surrey, UNITED KINGDOM
Status: offline 		Wow that big one is tempting. EF must stop making great stuff otherwise i'll be broke forever
Dyu reckon a saito 125 would be enough?

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RE: Extreme Flight RC Yak 54 - 74 inch! - 7/14/2006 1:14:40 PM   
tIANci



Posts: 8115
Joined: 1/15/2004
From: Kuala Lumpur, MALAYSIA
Status: offline 		Andy - its AUW with an OS160FX is just under 11 lbs. Hence I would say with the SA125 will just about fly her only with hardly much performance for good 3D. The SA125 will turn a 16x6 or even 17x6 giving you about say 13 lbs thrust thereabouts. The OS160 is turning an 18x6 or even up to an 18x10.

Maybe at least a SA150 at the for good 3D fun. I wanna get a YS160 for this baby. Seen one on my pal's CG SU26 and the performance is really nice even with only 5% nitro.

< Message edited by tIANci -- 7/14/2006 1:21:56 PM >

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RE: Extreme Flight RC Yak 54 - 74 inch! - 7/14/2006 1:20:45 PM   
AsM



Posts: 282
Joined: 3/24/2003
From: Surrey, UNITED KINGDOM
Status: offline 		Hmm. YS setups in the Uk are v. expensive with fuel costs so i'll probly go for the saito 180. Only 1oz heavier and hardly more expensive. Also ive been eyeing up that engine for a while now looking for an excuse to get one

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RE: Extreme Flight RC Yak 54 - 74 inch! - 7/14/2006 1:20:48 PM   
Maudib



Posts: 5833
Joined: 7/16/2002
From: Ashland, KY, USA
Status: offline 		I would think the Saito 1.25 would be the minimum engine choice for the 74" model. You might need to really work at balance with it being a full lb lighter than a 1.60 (including mufflers)

Still, with some effort and light building... perhaps you could beat the low weight in the suggested range... and maybe come in at 10 lbs? Until people get some (hopefully end of August) it's mostly conjecture as to weigh and balance.


I suspect that the 1.20 would be like the 1.00 was on the 68" Enough to hover with a little pull out... and a few mods to balance (like placing the battery on a "tounge" that sticks out over the engine. It would be an extremely light build... Run 30% to get maximum power from it... and a person might emjoy it quite well...


Still, if you haven't purchased a motor yet... the O.S. 1.60FX or Saito 1.80 are going to provide the 3D power most will require...

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RE: Extreme Flight RC Yak 54 - 74 inch! - 7/14/2006 1:24:12 PM   
tIANci



Posts: 8115
Joined: 1/15/2004
From: Kuala Lumpur, MALAYSIA
Status: offline 		I love the YS as it performs so well, of course you pay a lot for the engine and then the fuel cost is nuts. I hope to get my YAK up in about 2-3 weeks time, will let you all know more by then.

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RE: Extreme Flight RC Yak 54 - 74 inch! - 7/14/2006 2:15:05 PM   
Dart373


 

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Joined: 10/20/2002
From: Chapel Hill, TN, USA
Status: offline 		A 1.50, heck I have a 1.80 on my 68 and it just flys so well.... Yeah, its a tick heavy, but the 1.80 is an animal. As for the YS VS Saito... that Saito 1.50 or 1.80 drinks some fuel now! Neither are good on fuel... This is interesting to see the different power plant ideas... I am still waiting for the gas guys to jump in here with their ideas on a gasser... WOuld an MVVS 26 have 3D power?

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RE: Extreme Flight RC Yak 54 - 74 inch! - 7/14/2006 3:14:42 PM   
Maudib



Posts: 5833
Joined: 7/16/2002
From: Ashland, KY, USA
Status: offline 		Well, I consider myself a gas guy... very much so.

But when it comes to power to weight... everyone values different criteria... for instance I would never consider a Saito 1.80 on the 68" just too heavy for my wingloading tastes... It certainly would be mondi power:weight ratio though... and I really dig that too, but not at the expense of wingloading.

Now since you love the 68 with a 1.80 on it... then you're the type of person that needs to put a DA50 on the 74"... again I would never think of it... but you'd get a similar feeling aircraft... heavy wingloading but stupid power.

If you are looking for similar power:weight as your 68 was with a 1.80... you will not enjoy ANY of the 35cc or less engines on this plane... as NONE of them will spin a prop the same as a Satio 1.80 will... some will run an 18x6-8 at about 6500-7000 rpm... but your Saito 1.80 is putting out more than that. And the 35cc or under will weigh more.

At this point in time there really isn't anything in the 35cc or under class that is good for great 3D/light wingloading and are more suited for scale applications like a CUB, warbird, etc... UNLESS it's specifically designed ultralight and featuring a canister/tuned pipe... Like the 3W ExtraFun with the 3W28 on a can.

In my opinion the 40cc is right at the turning point for power:wieght ratio and wingloading on a plane this size... but still a little heavy...

Exactly why this bird doesn't have a "gas" recommendation for a powerplant.

When you are at this point... price is no longer a determining factor and it's about the same price to go with a sweet 50cc bird with a DA50... than something in this class with a smaller gas engine... Then you have a great gas powered aircraft with excellent power:weight AND wingloading.

With all that said... guys will fly this thing with all kinds of engines... from 3W 28's to DA50's... Saito 1.20's to Moki 2.1's... And almost everyone will say it's awesome. Because they will be grading with different criteria than you... and that's why we have such a disparage of reports on all aircraft.

It's best to look at what you have liked in the past... compare wingloading, engine/prop/rpms... and extrapolate accordingly... in your case if the 1.80 was hppy on the 68... then you'll need more than 35cc gas on the 74"... and a 1.60 offers more power to weight than a 35cc gas... spins similar props, but weighs 1.5-2 lbs less...


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RE: Extreme Flight RC Yak 54 - 74 inch! - 7/14/2006 10:12:03 PM   
Ian.W



Posts: 4286
Joined: 6/22/2003
From: Essex, UNITED KINGDOM
Status: offline 		On with some info!

Anyway, unlike many (read: 99% of them) companies, Chris has listened to peoples comments on the 68" yak, and changed things for the better on the 74. For example...... a pre-isntalled canopy latch!

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RE: Extreme Flight RC Yak 54 - 74 inch! - 7/14/2006 10:14:49 PM   
Ian.W



Posts: 4286
Joined: 6/22/2003
From: Essex, UNITED KINGDOM
Status: offline 		a strong, light Carbon Fibre tail wheel (stearable, just in this picture its not had its arm attached). Red screws are my own fittings, as i had them and they look cool

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< Message edited by Ian.W -- 7/14/2006 10:15:40 PM >

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RE: Extreme Flight RC Yak 54 - 74 inch! - 7/14/2006 10:20:48 PM   
Ian.W



Posts: 4286
Joined: 6/22/2003
From: Essex, UNITED KINGDOM
Status: offline 		Other things include the double truss phelonic controll horns, which will have heavy duty 4-40 dubro pushrods attached

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RE: Extreme Flight RC Yak 54 - 74 inch! - 7/14/2006 10:28:12 PM   
Ian.W



Posts: 4286
Joined: 6/22/2003
From: Essex, UNITED KINGDOM
Status: offline 		and again, this is another CAD masterpeice, first time these pics have been shown on the net!

and check it, NO FOAM!

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< Message edited by Ian.W -- 7/14/2006 10:38:18 PM >

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