I pity the poor guy who walks in and unsuspectingly buys THAT kit off the shelf. Maybe we'll get lucky and wind up getting to see a "how I had to untweak the tail" thread on it here.

Tommy
Interestingly enough, I too got a chance to run my 4 blade props this past Saturday.
I was turning a 14X11 and felt it was too much. So I went back to the 15X10 and actually felt like it almost wasn't enough prop. I do have a 15X11 and I think I like it better than the 15X10.
I plan to cut the 4 blade prop down some and try it again.

BTW Just for those of a curious mindset On Saturday Nat tried an 18X8W cut down to 15 inches on his OS91FX. It pulled like gang busters but was noisy. Bet it'll get better after he whittles on it somemore

Eddie

Eddie,
I haven't given up on the 3 or 4 blades quite yet , they are noticeably much quieter than any
of the 2 blades , just need to find the correct size and pitch. Dave Shadel suggested a 16x6
but this size had extremely loud prop noise and let the engine rev too high. One of my flying
buddies has a few Graupner 3 blades I am going to try but they sure have some wide blades ,
don't really look too efficient and the prop slot in the Tru Turn spinner doesn't fit . This is a
challenge , we need to figure this one out.

tommy s

Tommy, Have you weighed your Excelleron? If so, what did it weigh?
thanks, Tom

Just a hair under 8 lbs ready to fly less fuel.

tommy s

SInce following this thread I decided to add an Ecelleron to my stable.....just got here today. I have to say it looks nice and should fly nicely with my pumped OS 1.20 surpassII. After seeing how Bob did the pipe tunnel I can use the pipe and header I have.

I do have one question though....Should I even bother changing the mount as suggested? I can order a new mount and have it here before I have time to do anything on the plane since I'm putting my Prophecy back together at the moment.

should be sweet Tommy

I have first hand experience with both the Dave Brown (MK imitation) and the Excelleron (MK imitation) mounts. For my money/effort, I'd try the stock one first. It is really surprisingly effective. I've been very please with it's performance so far. If you decide you don't like it later, it is a slam dunk to install a DB mount.
As I recall, the OS doesn't quite thump as hard as those YS pounders.... less radical cam timing, I think....I'd give it a go, and bet a prop nut you'll like it.

I saw the guy write up the defect report on the kit. Besides, the seal was broken ob the fuse bag, and the covering was cut away fron the stab hole. Any one who doesn't catch that needs to be looking at trainers instead.

Does anybody have an idea how much rise the header would need if using a TT120 RE and going with the same pipe tunnel that Aerobob is using? I think the standard MACS header is a 1.75" rise, with a 2.25" also available. I'm thinking of using a Weston Mini Pipe as they're fairly quiet according to Volfy in Glow Engines, not particularly expensive, and alot shorter than a full blown pipe. Not to mention that Weston now has a USA distributor and I'd like to see them get off to a good start, Weston has some cool products.

The 2.25 would be too much; you'd be hitting the chin cowl bottom.
I'd go with the 1.75. That's what I found out I needed for the ST, and I'm sure the port height is very similar.

Thanks for th e input Bob....I'll give the stock mount a shot.

You are right that the OS doesn't pull as hard as ANY of of the 1.20 YS engines I've had but that is what I have to put in the plane....the YS's go in the 2M planes...

Now all I need is time.

There are some pictures on page 8 of this topic that shows the fit of a TT 120RP in my Excelleron. I'm using the 1.75" TT header and pipe.

Hello everyone,

Excelleron 90 is in the house!!! I should be able to start on it next week.

ST 2300
Hitec PCM receiver
JR-8411SA's
2400mAh NiMH 5 cell

This oughta' get me started.

I LUV THIS HOBBY!!!!

Ken Thompson
D4 Sportsman, again

Congrats! It looks like you will have a nice setup.

Hey guys any comments on th flight with the st 2300 and coments on flight with a ys 120?????? i think my excelleron will be ready some time soon i want to know what to expect! ill try a 16-6 and a 15-8 2 blade have futaba gear in it (standard lg but the ice point lg is on the way)

Grillo, I have about 12 flights on my Excelleron with a YS120 and it's a great combination. Plenty of power for verticles without a bit of lag. I used the supplied motor mounts and so far no problems. I did assemble the mount parts with JB Weld except for the wood screws. I used stock everything including the landing gear and good clearance with a 15-10 prop. It balances with a 1400 mah pack right under the lip of the tank which is mounted on CG. The great thing about this plane is it's bolt on the wing and go fly, rain,shine,windy or not. I know you will love the plane.

BBM[8D]

wondering if any of you have any experience with the excelleron 50?????

mike

Bob or Ken, what size prop are you going to use on this setup?

As i am going to run a 2300 on an Adrenilin90.Similar type of plane.

15.5 x 12 4 blade, 15.75 x 10 three blade (repitch of 13), 16 x 12 std....all of these fit the stock gear.

I flew my Excelleron yesterday for the first time. Boy! It is a smooth flying airplane!
Mine has a Saito 100 with a 15x6 APC pulling it, and while it is not a rocket in vertical it sure pulls it good enough to make huge loops and vertical climbs, have not tried vertical climbing snaps yet, but anything in the Sportsman and Intermediate patterns it can perform with ease.
Speed is great, I cruise at a hair above half throttle and only use full throttle when climbing, and this gives you a very manageable medium speed, it may be slowed a lot with a 16x4W but haven't tried that yet.
The specs on my plane are: DS8411 on surfaces, HS-55 on throttle, Saito 100 on 30% heli, 15x6 APC at 9,500rpm (rich setting, engine not broken-in yet), 2200 Li+regulator, CG at 7-3/8", original tank at the standard position, dry weight: 7.88 pounds, standard LG and hardware.
Inverted flight just needs that you 'think' you are pushing the elevator, just the slightest touch will hold it. Maybe it is a bit tail heavy, but I loved it's feel.
The only trim adjustment I had to do was up elevator about 8 clicks, it ends up pulled from visually centered to the stab, I don't know if this is an incidence problem, if anyone can share some way to check this? What is the wing and stab incidences?
The ailerons are really responsive, and if you use the manual settings you better dial in a lot of exponential and be easy on the stick. I don't remember what I used, but it was low rates and a LOT less than what the manual suggests for testing and even that was extremely fast. Elevator was set about 15mm as per aerobob's suggestion, and it is pretty smooth for pattern flying.
One of the most amazing things about this plane, at least for me, it's how EASY to land it is; it comes down smoother than any other plane I've ever flown (and I've tried a few). Just line up the runway, chop the trottle to idle, correct any cross wind and watch it, it needs almost no elevator until the flare, and even that is just a touch. You can perform perfect 3 point landings with no effort at all.
I am not used to flying a plane this light (it feels extremely light in the air) and the problem I had was with wind correction when doing loops and climbs, it felt as if the slightest gust of wind will throw it's tail off-track so I have to keep compensating a lot with rudder. But this is my problem, not the plane's.

One thing that did go wrong with the original kit assembly was with the servo tray. After I took off the first time, I found the rudder to be almost non-responding, and when I landed it was loose, the cables were completely slack. After I remove the wing, I saw that the front triplay doubler for the rudder servo on top of the tray had come loose, cleanly unstuck from the tray. Nothing a couple of drops of 5 min epoxy would not fix. But I recommend anyone who is building this plane to reinforce this with CA or epoxy before the maiden flight. Good thing the ones for the elevator are under the tray!!!

Gabriel
Juarez, Mexico

Gabriel,

That's a good report. I have a Saito 100 in my U-CAN-DO 60 that weighs 7.5lb and with 30% heli I can rocket straight up out of a hover (APC 16x4W prop). If your Excelleron only weighs 7.88lb you are right about good vertical performance.

How much weight did you have to put in the nose to get it to balance? I saw that the YS110 took about 6oz. So I would think a Saito 100 would take about 10oz. If you have to add too much weight, I think there are better choices for an engine, but if you have a Saito 100 sitting around (like I do), it may not be a bad option.

Dave

I didn't add any weight, I just installed the batteries behind the firewall, the fuel tank in the stock position and used an Aluminum spinner.
It ended up just a bit tail heavy, but nothing to worry about.
I want to make it lighter still, by changing the metal gears in the DS8411 servos to plastic, this should balance it a little bit better.
I had the Saito in a Staudacher and was supposed to install it in a U-Can-Do, but this excelleron got in the way and stole the engine.
I am very happy with it, as my other option was a YS140, but did not want to go to that extreme.

A friend (grillo) is installing a YS 120 in his, and it's gonna be a rocket.

Gabriel

Gabriel,
Man, I'm jealous of your flying field , wide open spaces !
I see I'm not the only one that didn't like the stars on the wing and stab.
The only caution I could give you is to make sure to reinforce the landing
gear mount as it is a little weak and will break loose if left stock. I've
been flying my Excelleron since September and I like it better each time I fly it.

tommy s

Bob,

Just got back into town, that 16x12 is a 3-blade, right?
Have yo gotten yours in the air yet?

I'll be starting mine this weekend, I think.

Ken