Katana v2 70 with an os 61?!?

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snomobila · 10-16-2008, 06:55 PM

For Anyone out there with any experience with the katana v2 profile, I was looking into getting the 70 size katana, (why get a 40 when I can get one bigger) I have 2 os 61 2 strokes I can use, would a 61 really fly it good enough to hover or do the extreme aerobatics? I know it reccemonds a 61 but is it really enough for the plane? Let me know what you know So I can decide to get it or not. Thanks.

XJet · 10-17-2008, 01:23 AM

They fly okay with a .90/.91 2-stroke but I think a .61 would be marginal for hardcore 3D flying. The Kat 70s really seem to need a 15-inch prop to get any aileron authority in a hover (the ailerons don't come all the way to the fuselage) and I can't see a .61 turning any lumber that big.

snomobila · 10-17-2008, 03:40 PM

Yeah, I see what your saying, I just don't want it to be too slow that it looks like a slow flyer, just barely making it into the air with the tail dragging ass.

Imac Kiwi · 10-17-2008, 04:19 PM

91 2 stroke minimum, Better with a bigger 4 stroke.

snomobila · 10-18-2008, 11:13 PM

dam...

Rush7 · 10-18-2008, 11:39 PM

Grab a Saito 100 an toss on it. It is a beast with the 100.

snomobila · 10-20-2008, 07:12 PM

I'll find something to put on it

XJet · 10-20-2008, 07:35 PM

The problem with .60/.61 2-strokes is that they're really inferior from a power-to-weight perspective.

Most of them only have a little more power than a good .46-55 (in a 40-wised crankcase) but weigh quiet a bit more.

What's more, these days most .60-sized engines are also available in .90/.91 displacement which brings the power-to-weight ratio back to .46-.55 levels.

Maybe for a warbird?

rv_ator · 09-30-2009, 11:54 AM

I have a 70 size Katana with an OS 91 Surpass. I use a 15 x4 W on it. It would be a dog with a 61 on it. If you already have the 61 buy the 40 size plane. That would be a better choice for your motor.

gelliebean · 12-08-2010, 08:17 AM

	Quote: Originally Posted by Imac Kiwi
	91 2 stroke minimum, Better with a bigger 4 stroke.

yeah, i think his right.

____________

http://cessna.us/

10-16-2008, 06:55 PM	#1
snomobila Flyin' Around Join Date: Oct 2008 Posts: 6	Katana v2 70 with an os 61?!? For Anyone out there with any experience with the katana v2 profile, I was looking into getting the 70 size katana, (why get a 40 when I can get one bigger) I have 2 os 61 2 strokes I can use, would a 61 really fly it good enough to hover or do the extreme aerobatics? I know it reccemonds a 61 but is it really enough for the plane? Let me know what you know So I can decide to get it or not. Thanks.

10-17-2008, 01:23 AM	#2
XJet Bad-ass Super Contributer! Join Date: Feb 2006 Location: New Zealand Age: 57 Posts: 832	Re: Katana v2 70 with an os 61?!? They fly okay with a .90/.91 2-stroke but I think a .61 would be marginal for hardcore 3D flying. The Kat 70s really seem to need a 15-inch prop to get any aileron authority in a hover (the ailerons don't come all the way to the fuselage) and I can't see a .61 turning any lumber that big. __________________ When I'm not here, I'm at RC Model Reviews

10-17-2008, 03:40 PM	#3
snomobila Flyin' Around Join Date: Oct 2008 Posts: 6	Re: Katana v2 70 with an os 61?!? Yeah, I see what your saying, I just don't want it to be too slow that it looks like a slow flyer, just barely making it into the air with the tail dragging ass.

10-17-2008, 04:19 PM	#4
Imac Kiwi Bad-ass Super Contributer! Join Date: Jan 2006 Posts: 878	Re: Katana v2 70 with an os 61?!? 91 2 stroke minimum, Better with a bigger 4 stroke. __________________

10-18-2008, 11:13 PM	#5
snomobila Flyin' Around Join Date: Oct 2008 Posts: 6	Re: Katana v2 70 with an os 61?!? dam...

10-18-2008, 11:39 PM	#6
Rush7 Huckin somewhere under the sun Join Date: Mar 2007 Location: Chattanooga, TN Posts: 1,812	Re: Katana v2 70 with an os 61?!? Grab a Saito 100 an toss on it. It is a beast with the 100. __________________ Florida Freestyle Aerobatics Association Chattanooga 3D Jam - August 4th, 5th, 6th and 7th

10-20-2008, 07:12 PM	#7
snomobila Flyin' Around Join Date: Oct 2008 Posts: 6	Re: Katana v2 70 with an os 61?!? I'll find something to put on it

10-20-2008, 07:35 PM	#8
XJet Bad-ass Super Contributer! Join Date: Feb 2006 Location: New Zealand Age: 57 Posts: 832	Re: Katana v2 70 with an os 61?!? The problem with .60/.61 2-strokes is that they're really inferior from a power-to-weight perspective. Most of them only have a little more power than a good .46-55 (in a 40-wised crankcase) but weigh quiet a bit more. What's more, these days most .60-sized engines are also available in .90/.91 displacement which brings the power-to-weight ratio back to .46-.55 levels. Maybe for a warbird? __________________ When I'm not here, I'm at RC Model Reviews

09-30-2009, 11:54 AM	#9
rv_ator Flyin' Around Join Date: Sep 2009 Posts: 11	Re: Katana v2 70 with an os 61?!? I have a 70 size Katana with an OS 91 Surpass. I use a 15 x4 W on it. It would be a dog with a 61 on it. If you already have the 61 buy the 40 size plane. That would be a better choice for your motor.

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