ORIGINAL: molokaiboy

<span style=''font-size: small''>I recently got a UCD .46. Installed some HS 475 HB's and a S3010, 6A BEC with 2 s 2000 lipo, running a OS55AX w/ pitts style muffler and a 13X4 MAS K-series prop. One of the pipes came off the pitts style muffler so I just covered it up temporarily to see if it would work, but I think it has way too much back pressure as it doesn't run the same. I had it mounted sideways with that muffler. I will be putting the stock 55AX muffler and see what happens. I have just put on the stock muffler and mounted the 55 upright, see if it makes a difference.

Anyway back to my thoughts on the 55AX in this UCD. I believe if your just going to do sport flying it has lots of power for it. It gets kind of windy where I fly, and I have difficulty locking it into a nice stable hover without it climbing or sinking. The mid range on this 55 has proven a little difficult to tune being it has only 2 needles.

There is another club member where I fly and he has an OS91FX and a 16x4 prop. More than enough power but then gain he doesn't do much 3d, more sport aerobatics.Being able to use a bigger prop with the 91 gets the airframe moving quicker.

My current set up has me balanced at 5.5'' with just 1 3/4 oz of lead on the firewall. Inverted requires almost no input on the elevator to keep her level. Plane is reponsive yet stable, slows to a crawl, you can pretty much land anywhere you want. She lands like a helicopter hehehehe. I'll try different CG's and see which ine I like better.

I am leaning to a 70-80 size 4 stroke. I think the ability of swinging bigger props at a lower rpm will make 3d flight better than a 2 stroke on my UCD .46. I've been flying smaller electric 3d planes, and have gotten quite used to the way electrics fly. I may convert this sucker to electric yet.

This plane is just a blast to fly in any wind conditions. Stable and responsive, landing is fun, it just crawls in. The amount of fun you can have for this price is unbeatable.

Aloha,
Les
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