Hi guys,

I have ordered my Katana .50 from Austria , since they (LHS) dont have it in Switzerland. I should get it in these days...

I saw in your advertisements that Katana .50 will weight 4,5 - 5,5 Lbs. which can be translated like 2 - 2,4 kgs. which is not bad.

But in CMP site I saw their claims that it will be 2,75 - 2,85 kgs which is 6 - 6,3 Lbs. which will be very heavy. I would like to know if they produce special planes for Ultra RC. Or is there any misprint or anything.....

Could you please enlighten us a little bit...

Regards.

Zafer

Hi Again.

I have got the KATANA .50 from mail today. I will check every detail and post.

Regards.

Zafer

I just weighted the parts, servos ( Futaba 3001), receiver(Webra syncro) and engine ( Irvine .53)

They are all together 2.700 grs. (nearly 6 lbs.) (and definetly not 4,5 - 5,5 lbs ) I will weight it again, when finished. Thou it looks heavy.

Regards.

Zafer

Mine came in at over 6 pounds with an OS.46 ax 2 stroke flew like a warbird and not a very good one!!! Lasted 2 flights snapped on me in a slow turn now its in the trash can! Not because it couldn't be repaired just because it flew that bad.[:@]

What prop were you using with the OS46AX?

I'm using the same engine, not flown yet due to weather (too cold). I don't have a scale, but now I'm going to get one so I know how heavy.

Greg.

I was using a 12X6 APC. I would get a weight on it before you fly it. It is way too snappy @ 6 + pounds.

Hmmm, that seems like too much prop for an OS46. While the OS46AX was on my Tiger II, I was using an 11x6W prop and also a 12.25x3.75. Both similar in performance really, at least, that I could notice with my Tiger II. My tiger "felt" heavy and is posted to be 5.5 lbs. So, given marketing fudge factors, I'd say over 6 lbs is not unreasonable.

From a magazine article, I recall that the OS peaks in HP near 12k rpm. With my 11x6W prop, I tach'd 10.7k rpm. With 12x4 (12.25x3.75), I tach'd 11k rpm.

I think I'm going to keep my fingers crossed. I do like the look on this model!

Cheers,
Greg.

I had one with a OS 70 in it... Flew it two flights and Snapped it in a slow turn while landing, I ordered a 2nd one and had a YS 63 in it that died and it fell like a brick... Afterthought... I think the plane needs nose weight and is tail heavy... Don't know if I will re-buld the 2nd one...

Hi again.

Today I have ordered pitts muffler for my Irvine .53 from JEN/England. Should be here in 2 weeks. I think I need to make some drilling and sending with engine mount and with the fuse to make it lighter. I think engine mount is made way too strong ( and heavy) so some cheesing will be possible. With pitts muffler and w/o cowling and pants, I will try to keep the weight about 5,5 lbs. ( not sure thou) . I have to use some light servos instead of std. ones as well.

I will post again when I start building.

Regards.

Zafer