I was seeing which I liked better, and it just seemed natural, just couldn't resist.

Gordo, have you flown it yet? How does it fly? How do you find the rudder authority in hover?

Hi Sean. Post #275 describes maiden flight. I had limited time, so after fooling with the engine a while and 2 deadsticks (great way to check out a new plane) I got one long flight. Didn't really try to "hover" but went up as far as it would and it was very good 'till it ran out of engine! So I'm thinking it would be great in a hover, but I have very little to compare it to.

I will do more today, and dial the engine in for max power. I got a new glow plug (hot) and lower nitro fuel, as everyone says these engines like 5%. We'll see!!!

Later

I have flown mine about 4-5 times and it is very easy to hover. The plane has a tendency to fall out once past15 degrees out of the verticle line, but a goose of the engine will get you back up straight.

I use a combination of the engine and rudder to manage my verticle line.

The rudder is the weakest part of the plane as it will barely hold a knife edge. I am slowly moving the cg back. Right now, I am about where they tell you to go in the manual. It could go back almost and ince, I'm sure.

It is one of the nicest flying planes I have owned as far as slow aerpbatics. Kind of like my modeltech Magic, nice.

I can get an inverted flat spin easily, but the other way is a little tougher...

Jim!

For CG, I found that 6" to be best. 6.25 is too much aft, as the plane will pitch up at inverted, and will pitch up momentarily when you slow down. Also, pitch and yaw tend to overshoot at this CG setting.

This plane is the best flat spin plane I've ever own. I'd imagine with more power, it could do a hovering flat spin. I will see if flaperon will help too.

Waterfall is really nice with full down elevator and coupled full up flap.

I really think you would enjoy it better if you have more power than Webra 91. I am not satisfied w/ the power that Surpass III 120 P provides. I tried 16x4W @ 9400 and APC 17x6 @ 8500, and both setup leave me wanting more. I will try a APC 16x6 to see if it's better. I plan to put back the Enya 155.

Are you flat spinning inverted, right side up??

Inverted

OK, 4 flights now. Very nice, lots of good stuff to say!!!

The Webra .91 was a test, as World Models said that they were flying several on OS91fx's. The Webra is more powerful than the OS, and more than most 1.20 4 strokes. I can hold the 16x4W at 97k all day on the ground, and when it holds the RPM in a hover it's GREAT!!! But that's a big When. I'm having lots of detonation and the engine sags bad most of the time in the vert position (but only airborne), don't bother with "it's lean" or "it's rich" as I've tried it all!!! I have a friend with lots of Webras and he's gonna help me out.

The reason I went with that engine was to keep the plane light. I'm just over 9lbs. I'll get the exact weight tonight. And the CG I started at 5.75, and I've moved it back 3 times, I'll see what it's at tonight, but I expect it's just over 6".

I like this plane, and I'll probably get a bigger light engine, but I'm staying light and 2 stroke! Any suggestions?

16x4W is a little heavy for the 91, I thought. Even a 4-stroke Saito 100 experiences some spool-up delay with it. Since 2-stroke mid range torque is not that strong, hovering at midrange with a large heavy prop can be frustrating. Try the 15x4W if you stay with the Webra 91. You'll get much more power, and some more thrust because it will get you into the engine's power range.

The new Webra 120 is pumped, and should give you enough power. Looks like you can't get away from adding a few more onces to your current setup.

Haven't seen a 15x4W. Will look to get one.

I had to repair the bottom portion of the left wing tip. It stalled just as I was landing and stalled to the left.

Anyways, not much damage, I had to replace some sheeting. During the process I noticed that the top and bottom spar both had a strip of carbon fiber embedded in them.

A nice touch, that should ensure the wing is stout.

Everything is repaired and ready for some flying tomorrow.

OH MAN!!! I tore the engine down last night to the bones, cleaned it and reassembled it, then I plugged one of the muffler outlets to increase the back pressure and increase tank pressure. WOW!!! I was sure Santa installed a new motor while I was sleeping!

At 9#5oz, and the 16x4w, this thing is a dream!!! Hover is great, but all of you are right about the rudder not pulling it out at more than 20degrees or so. but if it's staight to begin with, it holds really easy! I'm hovering at 90% throttle, so pullout in marginal, so I may end up with a MOKI 1.35 still, we'll see.

Harrier, super slow flight, tail draggs, slides, and general areobatics are really good. Harrier is rocky as Sean said, I tried to use spoilers, but little affect. One really cool thing was how well it dealt with the cross wind. I'm used to smaller planes and this was so great!

A+++++ from me, and to think I considered selling it in the box!

Later

Low alpha harrier is not bad. I had some landings @ like 20 degrees alpha where the tail wheel touches first.

I love those tail first landings. Have you crossed the field with the tail wheel dragging? That's a hoot! I keep trying to get the 45 degree angle, but the wing is probably too straight for that! I guess no one plane can do it all.

seanychen:

Where's your CG at now?

Jim!

I was at 6.25", now I am at more like 6". The tail first landing occured with 6.25" CG.

I'm at 6 1/8", lovin' it!

I finally got to fly mine last weekend. The YS 1.20NC is running rough and I am having a little trouble with the idle, but I didn't let that stop me.

My first impressions are favorable. It flies very much like a SIG SE and with a 17X6 prop and that thick wing it simply won't go too fast, and it will fly very slowly. I wonder what crow will be like? I still need to get the CG and the control throws right. As it stands now it barely holds KE and won't really spin. The snap rolls are kinda funky too... The ailerons are surprisingly effective and rolls are very axial. I really enjoyed flying it straight up until it stopped, and pulling full up elevator. It would just pivot about the wing and come down without gaining too much speed.

I am also impressed with the HS5475HB digital servos that I have installed. I was afraid that an 1100 mah 5 cell pack would not be enough to drive all 8 servos. After 2 10 minute flights the voltage was still more than 6.5 volts. I'll need to discharge with my cycler to be sure, but right now it appears that they are not all that power hungry.

Now if I can just get the YS sorted out...

Also, I don't know exactly where my CG is, but if I roll inverted it holds altitude without any down elevator. This would seem about optimal, but other flight aspects lead me to believe I should move it back further. Opinions?

At 6" plus I needed just a very small touch of down to keep it level. But other factors can affect that too.

You guys have to try inverted flat spin with flap coupled to elevator. I was doing this today, full right rudder, full right aileron, full down elevator, and full flap up. It was doing sustaining inverted flat spin. It was so cool to watch the thing just flat spin hanging there. It did move close to the pit area due to the cross wind, else I'd kept doing it until I run out of fuel.

Hi Sean,

What transmitter are you using? And is it really the flaps that your couple? The programming that I have in my Futaba 8U Super will only couple the ailerons to the elevator... I have the crow and other mixes, but cannot get a true flap to elevator coupling...

GalenB:

This is from my 9CH

Receiver Configuration
Channel Function
1 Right Aileron
2 Right Elevator
3 Throttle
4 Rudder
5 Right Flap
6 Left Aileron
7 Left Flap
8 Left Elevator
9 Battery 1
DSC Battery 2



Fun World 3D Futaba 9C Radio Programming

Function Action/Result
Press and hold the <Mode/Page> button Hold for 3 seconds
Press the <down cursor> button [Basic(ACRO)] page 2
Press the dial to select [Aux-CH Select]
Move to CH5 and turn dial CH5>NULL
Move to CH7 and turn dial CH7>Vr-E
Press <End> [Basic(ACRO)] page 2
Press the <Mode/Page> button [Advance(ACRO)] Page 2
Select Flapperon Activate Flapperon
From the Advance ACRO menu cursor to page 2 [Advance(ACRO)] Page 2
Select Ailevator Activate Ailevator
Select Air Brake Activate Air Brake
Setup Program Mix 1 Master - Aux 1, Slave - Gear
Link - Off
Position - Null
SW - C
Position - Null
Rate - L -100%, H -100%
Offset - 0%
Setup Program Mix 2 Master - Aileron, Slave - Aux 1
Link - Off
Trim - On
Position - Up
SW - C
Position - Up
Rate - L -100%, H -100%
Offset - 0%
Setup Program Mix 3 Master - Aileron, Slave - Gear
Link - Off
Trim - On
SW - C
Position - Up
Rate - L -100%, H -100%
Offset - 0%
Setup Program Mix 4 Master - Aux 1, Slave - Aux 1
Link - On
SW - C
Position - Up & Center
Rate - L -100%, H -100%
Offset - 0%
Setup Program Mix 5 Master - Gear, Slave - Gear
Link - Off
Switch - C
Position - Up & Center
Rate - L -100%, H -100%
Offset - 0%

May not be the best way, but I get all of the functions, break, ailevator, coupled flaps.




Jim!

Wow Sean, that sounds cool. I was trying hard to get into a good flat spin, but it wouldn't. I'll try that!

I use Airtronics Vision, a 1990 computer radio.