MinnFlyer

My Feedback: (4)

Oh! You're using fixed gear. Either way I guess, you'd still want to move them out one bay

vmsguy

What Mike hasn't mentioned, is that moving the landing gear out also passes the TLAR (that looks about right) test.

It looks really goofy with the narrower gear.

blw

My Feedback: (3)

Yes it does pass the TLAR test.

I decided on the fixed gear because I'm adding servos to the wings for ailerons.

MinnFlyer

My Feedback: (4)

What does that have to do with it?

RussianFlyer

MinnFlyer,

I've seen the pics of your retract, aileron and flap servos mounted in the center of the US60 wing. It looks like a lot of the center section was cut out to install all the servos. I'm wondering if that compromises the structural integrity of the wing or is it irrelevant? I want to place the 3 servos in the center, but don't want the wing to fold on me.

blw

My Feedback: (3)

I just thought that was enough in the wing and total weight. I'm sure the wing would take more servos and retracts.

vmsguy

Mike will probably respond with some cool drawings..

But I'll throw in my $0.02.

As long as you don't compromise the main wing spars. And you fiberglass the joint, wing integrity should be fine.

There's no rule that says any center mounted servo must be perfectly centered on the center wing joint. In fact, you might be better to mount them side-by-side, with the center wing rib separating them. It all depends on what you want to accomplish.

RussianFlyer

Had to think about that one for a bit, but I think I may have been giving the center wing ribs too much credit for holding stuff together. It is the main spars and joiners that bear the burden. Thanks for the responses

RCKen

My Feedback: (9)

You are absolutely correct. It is the spars in a wing that gives it strength. You will be fine putting your servos in the center of the wing.

Ken

MinnFlyer

My Feedback: (4)

Yup

blw

My Feedback: (3)

Side by side servos is a good way to use existing torque rods.

MinnFlyer

My Feedback: (4)

That's a waste of a servo IMHO

vmsguy

I'd have to agree with Mike on this one.


I can see two possible reasons why I'd use two servos on torque rods.

1. The torque/speed requirements are more than a single servo can muster. A high torque replacement is unfeasable (cost, or availablility, or whatever)

2. You want to some thing funky with throws. More "up" and/or less "down", for example.


In both cases, the builder wishes to retain the torque rods, and not have servos out in the wings. For whatever reason.

But then again, I can't see these needs arising on an Ultrasport.

box car

I have build the US40, 60, and 1000, so my next project is going to be a Ultra Sport 120.  I will use an OS 120AX for power. I have RCM plans for the US60 so will have to get them blown up to the size for the 120. This is were I could use some help from you guys on what % should I use.
Ken

box car

Will I guess that was a bad ideal seeing how the 1000 could use the 120AX, oh well on to some thing new. Should have looked at the specifications for the 1000 first.
Ken

BelAirBob

Actually, if you build an US1000, you may want to consider an OS 1.60. I used an MDS 1.48 before it crashed....but that is another story

bel air bob

box car

Bob, I had a ST3000 in mine, and I have RCM plans for the 1000 and when I build it I will go with the 1.60.
Ken

blw

My Feedback: (3)

vmsguy- I like trimming individual aileron servos better. Also, I set aileron differential the best I can get it. I know you can do that with torque rods too.

BelAirBob

The US1000 with OS 1.60 should be spectacular.

box car

I am still thing about an over size US60 about 12 to 15% bigger and using the 120AX.
Ken

SeaJay

My Feedback: (6)

Box Car,

I have an ST 3000 in my US1000, although I am playing with the idea of going to a moki 1.8 or 2.1 ( I also see that Moki has a 30cc gasser) any thoughts on this, or just stick with the ST3000..  What size prop were you using with your ST?  I am currently using an APC 17x12 (or 13 I cant remember for sure) and getting about 7700 rpm static. I am wondering if I should be getting higher rpms...  I am not sure how old the engine is, but it seems to run pretty good..  It hand starts easily, and runs well.. 

Any thoughts? 

Craig. 

box car

Craig,
            7500 RPM static is what they call for, so you are not far off. I run gas engines but would not pull my 3000 for one.
Ken

G.Barber

My Feedback: (1)

Looks like I'll be #67! I inherited an US 40 partially built kit from Minnflyer in a trade.

I'm excited already, and this is going to be my winter project!

vmsguy

Me thinks Mike is secretly building another US..

Considering all the razzing he took when he stalled out on his last build. (he did finish it after a while).. I don't blame him for keeping this build to himself....

MinnFlyer

My Feedback: (4)

Nope. My next US is going to be a 60.

I've had a 40 kit that my son built one wing panel on a few years ago, but then he moved out before he finished it, so Geoff's gonna take it.