I have been looking at the World Models Spot On 50. I have An OS 70 Surpass engine that needs a good home. I have read mostly good things on here about World Models ARFs and I would like to hear from all who have built AND flown this model using a four stroke like the OS 70 Surpass or similar. Things like;

1. ARF quality, structural design, and hardware quality?
2. Easy build?
3. Build Problems or mods and improvements you felt had to be made? (detail photos welcome)
4. Did you mount engine inverted or sideways? Problems or suggestions here?
5. Hardware quality or problems?
6. How did it perform with 70 Four Stroke or similar?
7. Flight performance, ie tracking, aerobatic capabilities, stall characteristics, high speed, low speed, etc
8. Flight problems.
9. If you've had it a while, how is it holding up? ie, LG, cowling, hardware, structure, etc.

At $130.00 looks nice and is tempting, but is there something you now you really wish you had spent $30.00 more for? What would that be?

Can we include the covering in the thread, too?

its my first dedicated pattern ship, it flies great. but i cant really compare it too another pattern ship... i blows away my ultra sport and showtime 50 btw http://www.rcuniverse.com/forum/m_76...tm.htm#7631766 the covering is crap though, i had to use ca all over the place

I've had 2! One had a mid-air mishap with a full size pattern ship! The other I tip stalled whilst doing a go around! (finger problems!).

The first had a Magnum 70fs inverted, and the second an OS 50SX side mount. I prefered the OS, but the 70fs will fly it OK.

Build is very easy, construction is very solid, you may want to put a bridging piece of alloy between the landing gears. Because they are 2 seperate pieces. The airframe will break up into a million pieces before the gears....they are solid!

Both planes requires the batteries to be fairly aft to balance on the CG, the plane is slightly nose heavy.

Covering!!! iron everything and use clear tape all leading edges of the patterns, where the airflow can pick it up. That's all I would recommend!

The second gen of the plane has improvements on the wing installation, it is much more solid with the "squared" front end butting up to the front bulkhead. Also the fully recessed wing servo mounts.

The wing has a fixed up incidence, it will tend to nose down on inverted. This is more apparent on the second gen planes than the first...don't know why?

I don't really have much problem with the hardware, some people like it, some don't. One thing I did have to do is put a mid bridging piece of balsa on the throttle linkage, that linkage flexes too much, just glue it down against the rear bulkhead.

Do I recommend the plane? Yes....although I have not had much luck with the Spot on...I will be buying my third one shortly!