kennyandannie

My Feedback: (2)

Tommy,

I just went out and checked my CG again. When I thought I was at 7 1/4" I had been checking from the wrong mark. I just added 1 oz. just in front of the tail wheel and the CG is right on. I will fly it like this and see if I like it, then maybe try to move other things around to keep the same balance while shaving weight. I'm trying to deep from cutting a hatch for the battery to keep my 7 1/4" CG.

I should know by tomorrow night.

Thanks for the reply,

Ken

alloymach

does anyone know how much right thrust is a good starting point for the excelleron 90? I am using a ys 110 with a 15 x 8

swlarcham

My Feedback: (1)

alloymach
Just line the back of the spinner plate with the front of the nose of the plane. The right thurst is built in and that'll be about right.

Just an observatioon but that 15X8 is only good for break-in and some say to not evendo that, but break it in with what you'll be flying it with.A 15X10 and you'll be happier, until you go to a 13X11 4blade
Eddie

kennyandannie

My Feedback: (2)

alloy,

Eddie is right about the lineing up the spinner backplate, but remember to keep your engine parallel and centered in the engine mounting blocks.

The right thrust is built into the blocks, and you could possibly have the spinner lined up and the engine could be off.

Don't ask me how I know that this is possible.

Ken

alloymach

Thanks Eddie and Ken, I should have her ready for the maiden flight this weekend I am currently flying a CA models Epsilon with a ys 110. We'll see which plane gets first chair in my orchestra

Thanks again,

Rob

checho4

My Feedback: (4)

Hi , I am from Colombia and I have been flying for 6 years, this year I want to participate in the masters category.
The problem is that I cannot buy an "2x2" because I don´t have any money(next year i will buy it) , and I decided to buy a .90 pattern plane.

¿What do yo think?¿ Will the o.s 91 fx work good?

tommy s

My Feedback: (55)

The OS .91 will fly the airplane but the Excelleron is big for a 90 size airplane and
the OS will only be marginal power especially for the Masters class. I have a YS 1.10
in mine and it could handle an even larger engine if you wanted it.

tommy s

petec

My Feedback: (58)

I have to agree with Tommy in that the 91 will probably not have enough power for masters. I have a YS 1.20FZ in mine and it has unlimited vertical. For the size of the airframe it is a bit overpowered but the 91 would make foir very short vertical lines.

Just my $.02

Bob Pastorello

My Feedback: (198)

Depends on a lot of things. A friend of mine has one with a stock OS 91 FX, on stock muffler, and it has plenty of punch. Sometimes choosing a slightly different prop can make huge differences when it's not piped. No doubt at all it could use MORE, but his is sure putting out some stuff.

alloymach

What a weekend!!! The excelleron 90 and 110 combo is awsome I was very comfortable with the plane after only the first flight. This is unusual for me as I just started learning how to fly pattern. This plane tracks very well in crosswinds. My verticals are not as strong with the excelleron, (epsilon was 13 oz lighter!) but adequate for me. The excelleron looks much larger in the air than my epsilon, so thats why it seems to "groove" a little better. I am looking forward to my first contest this year.[&:] I would say that for now the epsilon will be my contest plane..... it just feels lighter on the sticks and is more nimble to me. Who knows, after a couple more weekends things could change.

Arthur_GA

My Feedback: (3)

I found a video of the Excelleron 90 but now can't remember where. Does anyone know of a link to it?

Thanks!

kennyandannie

My Feedback: (2)

OK fellas,

I'm going to start work on my new fuse in an hour or so. I don't think I will use the ST 2300 in this plane again. It had plenty of power but I had several deadsticks with the ST and the last one cost me the first fuse. I made some landing gear changes on my LA-2 and I'm getting pretty comfortable with the plane, so I'm not without a bird.

I have two engines that I could use and I'm thinking about getting a YS-120 for the front of the Excelleron.

The two engines I have on hand are an OS 120 w/pump and a spare YS 91 AC. I've also looked at the GMS 120 2 stroke from Tower.

I'd like to go with one of the engines I have on hand but I can get another if necessary.

Help me make a decision, from your experiences, please!

Ken

obolel

In my opinion, ST 2300 was an overkill, it made the plane heavier, therefore increased your stall speed. You possibly either tried to land fast to avoid a stall and crashed, or slowed too much, snapped and crashed; leading to the destruction of the fuselage.

I have a YS 110 in mine, and it is more than enough. In my view, YS 91 is enough, because I think YS 120 is also heavy for its size.

If built light, plane really do not stall, it just mushes -if balanced laterally-, you can deadtick as many times as you can have, simply it will not have enough energy to destroy itself.

3D is not just about putting awesome power in an airplane, it is putting awesome power AND AT THE SAME TIME making it very very light, which makes construction very challenging. YS shines in that respect because it generates awesome power in a lighter package.

If a compromise has to be made, it is better to build it in a light configuration ( YS 91 ) than to have more power ( YS 120 ).

Just my thoughts...

kennyandannie

My Feedback: (2)

Deadsticks are normally not a problem, the last one was but it was my fault the plane went in, indecision will get you everytime.

The plane flew very well with the ST, but I need a more reliable motor, one that I don't have to mess with.

This plane is to be used predominately for Pattern, I've got other planes for 3D and just playing around.

I certainly appreciate all thoughts, thank you.

Ken

swlarcham

My Feedback: (1)

I originaly flew mine with a YS91 AC. It flew OK but would not be strong enough for the taller maneuvers in 402.
I have had the opinion that a YS120 was not stronger than a YS110 , just heavier.

I still vote for the YS110.

If we didn't have to deal with a 1 piece wing, my 1st choice would be for an OS91FX on a Looong tuned pipe(26inches from glow plug to 1st baffle is what I remember). Definatly lighter AND stronger than a YS110. It'll turn a 14.5X11 4blade APC . the YS110 struggles to turn a 13.8X10 4blade APC. BUt that setup is also getting expensive.
Eddie

Vince J

My Feedback: (1)

If you go Back to about pages 15-17 I think you'll find that there was great discussion on this and that OLD Dog 60 did some work with the OS 91 with pipe and Bob ....Check that go to page 15 Old dog is there and Aerobob has a lot on this.

Good luck--Vince

swlarcham

My Feedback: (1)

Thanks Vince
Yaeh I read all those posts at that time. I was about ready to assemble My 2nd Excelleron and even purchased a header and motor from Aerobob -but I decided to go a different direction.

I was just voicing an option. The OS91FX is underestimated tremendously. When piped and proped correctly it is an amazingly strong motor. I've seen one turn an 18X10 APC (no that's not a typo) uncut and fly well.

Eddie

Bob Pastorello

My Feedback: (198)

Since I started this thread, there has been a LOT of creative, interesting, and challenging posts. Just goes to show the diversity of our interests, and the number of variations on a theme that are possible.

It was a good ride! The Excelleron proved itself to be a capable pattern airplane, and properly powered (to the OWNER'S preferences), it IS a great airplane. Considering it's price, it is also a great VALUE.

If I were doing another, what would I do?

There is NO DOUBT in my mind I would do the OS 91 FX on a long-ish pipe, and turn a smaller three blade setup to manage energy better.

Mine has moved down the road, hope the new buyer is happy with it, overpowered and all.
Enjoy your Excellerons, men!!!

Jim Oliver

My Feedback: (1)

Aerobob et al:

How do you think the Older OS 90 FSR would do? I have had one for many years, still NIB, could use a home.

kennyandannie

My Feedback: (2)

I've been going over this in my mind and I think I'll give the ST another chance. I sound like my wife, changing my mind all of the time.

The only problem I had was the engine must not be tuned quite right, on the low end. That is a problem I need to be able to fix, it's a matter of principle.

Bob,
I'm going to go back to your ST page and re-read the info and give it another shot. I sure wish you lived closer, I could sure use your help with this one.

Ken

mprediger

My Feedback: (11)

Ken, my ST needed to be 1/4 turn leaner than stock after break-in (also using a Cline regulator as tank is on CG)

Some mods..

Built as a pattern only (no 3d)

Using MK ball bearing links stand offs were too short with the deep bevel on the surfaces. Mfgd my own from some delrin stock and installed ball bearings (min 3:1 mechanical advantage)

Home made CF cannister (3.5 oz).

Removed counterbalances from rudder and elevators and spliced them on the h.stab and v.stab

Dual elevator servos.

Pull pull rudder above stab and new mount for servo

Tank to CG

HS55 throttle servo in the engine compartment with ball links at both ends.

Bolly gear 2.5 inch wheels


I don't have any way to compare the performance of the modded surfaces to stock (with counterbalances) but the plane is locked in stable in all vectors. Using somewhat lower throws (Elev 14 degrees - Ailerons @ 12 degrees with 7% differential - Rudder 35 degrees). No mixing anywhere (except the obligatory throttle bump for full rudder stall turns)


Good Flying
mike

snap_roll

wad pipe and header do u guys reccomend on the OS91 FX for the excelleron?

snap_roll

do you guys think an OS91fx would be powerful enough for neat decent verticals?

GDAVIS

Snap Roll,
I use a Perry fuel pump VP 30, A Karl Mueller header, a Macs *1190* Tuned pipe, and a Dave Brown Vibra Damp pipe mount. I cut approximately 1 1/2 inches off of the header and the OS 91 FX turns an APC 14-10 at 10,000 rpm's. The Excelleron has truly unlimited vertical. The engine does not fall of in power at any time. The power is astonishing! Masters sequence can be flown with ease on this setup.
Greg

Vince J

My Feedback: (1)

G Davis

One question. What fuel ( % of nitro) do you use?

Thanks