Riverdancer

My Feedback: (5)

Good Day Gents,

I am planning to work on my 3d (OK... Learn 3D) this season and I have ordered the Katana V2 70 from OMP, sounds like good starting platform. I have to get an engine.. Seems every thing from an OS61 to Saito 180's are being used with good success.

I haven't read slot about the 120 yet but I suspect at just a few oz's more than a 91 it should be a good choice. Saito 125 would be the other option.. but there is always a but.. takes a bit more cash..

Thanks in advance Gents.. PS I am reading mixed reports on the weight.. should be 6 to 6.5 lbs with the 120?

All the best

Riverdancer

Spacey

Well how much more does the 1.20 weigh than a OS .91 FX? Seems like some folks are misreading alot when it comes to powering an aeroplane. I stand by what I said initially about my Kat 70 with the Super Tigre .90 (Now remember the ST puts out less power than an OS!) on it. The plane had plenty of power with this motor! Now by that I mean it had MORE than enough power. If it had just enough power I would have said something like:"The power is okish". You're going to have a hard time flying that plane through the 3D stuff with a 1.20 on it. Unless the 1.20 doesn't perform very well. Now I know some people have put Saito 1.25's and YS 1.10's on these things but a 1.20 2-stroke's power if all makes sense is going to be ridiculous to handle.

Riverdancer

My Feedback: (5)

Spacey thanks for the input..

I would like to have hover at 1/3-1/2 throttle capability.. Do you think that an OS91 will do that? and if so on what prop? I've had a 120 on a 10 lb airplane and it would hold it in the hover but there wasn't a whole lot left to climb out.but I could not hold it very long. Now having said that..If the sim is anything close to being real the better you get at hovering the less power you need?

All the best.. Riverdancer

aerofundan

i have flown one with a OS 91 FX with a 15x4 prop and it was crazy on power! i can compare it to almost as same power as a funtana 90 with a os 160 fx!, i'm sure that you don't need more than a 91 2 stroke or 100 4 stroke!!! i'm putting a saito 100 on mine, should be CRAZY on power! remember these planes are light! any bigger engines will just make it stressfull to fly! you'll be thinking more on keeping the speed down than flying! also with the 91 fx it hovered right at 1/2 throttle! i even flew it with a gms 76 2 stroke and already the plane had crazy power!

here is a couple of videos from the katana 40 and 70

http://www.dodvideos.com/Aerofun/videos/aerofun2006.wmv

http://www.dodvideos.com/Aerofun/videos/profilefun.wmv

http://www.dodvideos.com/katanags40.wmv

Daniel
www.aerofunrc.com

Riverdancer

My Feedback: (5)

Thanks Daniel.. the video's were good..

That's the convincing I needed. Was th 70 version powered with the GMS 76 in that video? Lots of power

Thanks again for the input.. gents.. looks like Spacey has posted once or twice on this site as well... did a search on "spacey" and it was like typing "sex" into google.. wait a second, havn't actually tried that...searching... Yup.. same thing 200 some odd million pages. LOL

I will toss in an OS 91 FX... they are cheap too... 15 x 4 or 16 x 4 APC Wideblade is the way to go for a prop?

AFSalmon

My Feedback: (3)

I saw the ads for the new OS 120 and it looks very impressive. Weight and size were pretty much on par with the .91 so bottomline is this engine will be a good choice for heavy 90 size models. Noe the kat 70 is not heavy though but with a 1.20 or 125 4-strk, it would definately be a rocket plane.

aerofundan

hey, yup it was powered with the GMS 76 using a 13x5 prop, for the 91 fx the 15x4 is the way to go! that way you can have a fast spool up, if you go with the 16x4 it'll work but rpms will be kind of low, and spool up kinda slow!

Daniel
www.aerofunrc.com

Riverdancer

My Feedback: (5)

Thanks Daniel,

That will be great... The OS 91Fx will work just fine... Should be a good 3D Learning/Practice airplane. Thanks again for the video links..

All the best,

Riverdancer

aerofundan

yeah, its a great plane for learning 3D!!!

Riverdancer

My Feedback: (5)

Thanks to all for showing me the error of my ways.. 91 is enough.. 91 is enough,....Ok I think I've got it.. !!!!

Now I am looking forward to seeing it arive... hope the ground hog is on our side tomorrow.. Where is that post office guy/gal!!?

All the best,

Riverdancer

Harleyflyer

My Feedback: (9)

I just ordered the V2 70 yesterday which will be my first profile. What servos are people using? I am thinking some kind of Hitec digitals running 6 volts. Also, what about the throttle servo? Is everyone pretty much using the stock hardware? I think I will be putting a Saito 100 on it and running 30% heli fuel.

Thanks in advance.

aerofundan

you can use standard servos, i did on mine, but the better servos you put in, the better it will feel. i highly recommend a high torque servo on the rudder too!

[email protected]

My Feedback: (1)

I am using the Saito 125a with 945 servos. On the 6 gal. of all out 3d. It is a fun plane.

Spacey

Regarding the servos: Aerofundan nailed it there. Standards will work as I've also used them on the ailerons of the prototype I got but quickly after I swopped them out for servos with more grunt. I had JR 539's on the tail and they are happy but the ailerons had just standards on and were very sluggish. When I swopped to some more 539's on the ailerons things improved alot so I would definitely try to get servos with a little more grunt than standards.

Hobby-Motory

Factory recommand no more than 110 in 4C range ...

you guys are going over the limit.... Usually it is better to go little over what it says on the box,
but guys, this is new manufacturer we are talking about, and no one really tried it yet,
so please, listen to the ones that have tried it, such as I , Spacy and maybe one more I missed,
just dont be surprise if at the end of day, you plane will fly bad, beacause total weight is too much
and the extra power starting to break the plane apart...

Trust me, I know, I flew it, I have tested it, just watch the video and learn it,
why you will want more power than really over power with a 90 size???

Riverdancer

My Feedback: (5)

Good Day Gents,

Good Day Gents,

Thanks again for all the input.. I appreciate the effort gents.. I would agree that something a little better than standard for servos would be a good idea.. they may work but they are kind of spongy.. (not that I knew that when I used them in a trainer )

I like the Saito 125 idea.. not to heavy and decent power.. Hilltop guy.. could you celebrate on the performance.. what prop and what fuel? Oh yeah, a 91 is enough, a 91 is enough.. Mm...uuuust Rrreeesist..

PS: Spacey... Could you show me a link to your video if you have a moment.. I had a chance to look at Daniels.. flew well on a 76.
I will more than likely put an OS91 Fx in mine.. I just like the larger engines.

All the best..

Riverdancer

AFSalmon

My Feedback: (3)

I like servos with around 75-100 oz on my 90 size planes. Better speed means faster and crisper response so it boils down to how much you want to spend on servos. I fly mine with an OS .91 and it is plenty of power for any 3d I want to do.

Riverdancer

My Feedback: (5)

Hello Salmon..

Sounds good, I think the ones I plan to use are 80 or so oz's on 6 volts... you are using a 91 2c or 4c ?

Thanks

Riverdancer

analog_boy

My Feedback: (1)

well hello riverdance,

you want to go with the 91. that way you and your son will have equal airplanes. that way it all boils down to the flying skill and then we can finally see who comes out on top and besides you wanna save your money like your always telling me

aerofundan

if money isn't a problem, i would heavily recommend going to a 4 stroke, a saito 100 would be awesome on it! i really feel 4 strokes have the advantage over 2 strokes while flying 3D. at least for me i like much more the feeling of it

Riverdancer

My Feedback: (5)

Good Day there Analog-boy[sm=bananahead.gif] Son

That sounds like a challange are you sure you are up to that.. I might have to go with a 61 just to make it fair..[sm=drowning.gif]

And you are right.. you should save your money... [sm=thumbup.gif]

How's that patty coming along.. [X(]

Riverdancer (Dad)

Harleyflyer

My Feedback: (9)

I have a couple of questions. What do you think would be a good servo for the throttle....standard or mini....what specific Hitec one would be good? Also, if I were to use a Saito 100, what would be the ideal prop?

Thanks in advance to all.

Riverdancer

My Feedback: (5)

Hello Harleyflyer..

I like the mini's (Hitec HS-245 or 5245) for the throttle.. as they are pretty quick and have a decent geartrain that stays tight. I think the majority of folks put cheap servos on the throttle because it doesn't take alot of power but to get a good reliable idle it's nice to have a good servo....as for a prop on the 100 I don't have one but I suspect the APC 15 x 4 wide would be a good choice. Some one that owns one will chim in I'm sure..

Take Care

Riverdancer

Harleyflyer

My Feedback: (9)

Thanks Riverdance....appreciate your comments!

Spacey

Riverdancer: Don't worry you're not missing anything by not having seen my videos. I tried them out but they are not working anymore. Sure I saw OMP had a problem with their bandwith or something but I can't recall now. I did manage to find two pictures of me flying it though? I know there's about 30 more right here on the profile forums in the original Kat 70 V2 thread. There was also 3 videos but I have no idea what happened to the 3rd one. Maybe it was too boring and it dissapeared in cyberspace. If my memory is correct though both videos on the OMP website were the first two I made. No way for me to check now though sorry!

http://ohiomodelplanes.com/62katanaarf/