Extreme Flight 110" 100cc Yak 54 Build!

[Cracky]

Its looking great so far! Can't wait to see it done. Thanks for taking the time to put up your build thread.

I have a question or two. Are there places for tail rudder servos and if so has Chris done any testing with a single 8711 on the rudder to see if it is enough? I have a single 8711 on the rudder of my H9 260 and it works great but it has a smaller rudder than this Yak's which is huge. The other thing that I wanted to know is if there has been any weights posted for the completed plane. I'm assuming that yours is one of the first production planes in the states and prototype to production varies. I was figuring 28-29 lbs with cans because of its size but that was just merely a guess.

Thanks for any info!

[The Flyin Hawaiian]

Cracky,

I am sure that the JR8711 will probably be sufficient. But I opted to use the HS5955TG instead, because I already had them, plus I've had bad experience with JR Servos. I had a 50cc Velox and a H9 Extra 260, w/ JR8611's and was always chasing gear slop problems. As I recall, I had problems with rudder servo always oscillating cause it was always "trying to center it self" so it would sit on the flight line just wiggling bad and caused the planes tail to wag during flight. I replaced all the servos w/ HS 5955TG and never had a problem since and never looked back.

I am shooting for 27 lbs or under, which is very realistic cause the plane is very light and strong.

[Cracky]

	Quote: Originally Posted by The Flyin Hawaiian
	Cracky, I am sure that the JR8711 will probably be sufficient. But I opted to use the HS5955TG instead, because I already had them, plus I've had bad experience with JR Servos. I had a 50cc Velox and a H9 Extra 260, w/ JR8611's and was always chasing gear slop problems. As I recall, I had problems with rudder servo always oscillating cause it was always "trying to center it self" so it would sit on the flight line just wiggling bad and caused the planes tail to wag during flight. I replaced all the servos w/ HS 5955TG and never had a problem since and never looked back. I am shooting for 27 lbs or under, which is very realistic cause the plane is very light and strong.

I've heard of some people having problems previously with 8611's, I haven't had issues with my JR stuff so I just keep on using them. I was just hoping that there would be a mount in the tail because I really like the direct linkage to the rudder.

27 lbs would be insane. Thats what my 260 weighs and is nicely powered at that weight!!!

Thanks for the info!

[The Flyin Hawaiian]

	Quote: Originally Posted by Cracky
	I've heard of some people having problems previously with 8611's, I haven't had issues with my JR stuff so I just keep on using them. I was just hoping that there would be a mount in the tail because I really like the direct linkage to the rudder. 27 lbs would be insane. Thats what my 260 weighs and is nicely powered at that weight!!! Thanks for the info!

Cracky, As far as I can tell there is no servo bay in the tail.

[Cracky]

OK, Thanks!

[buttface]

Thanks!

[STLAV8R]

Rennie - How come you are running a power box? Is it necessary? What would happen if you had the exact same set up but did not use the power box?

[Edge540 Freak]

subscribed...this yak is a thing of beauty

[The Flyin Hawaiian]

	Quote: Originally Posted by SnaprollJ ohn
	Rennie - How come you are running a power box? Is it necessary? What would happen if you had the exact same set up but did not use the power box?

I already had it on hand with the 4000 mah redundant batts. I know its alot of power, but I think its perfect for this airplane, Double redundant power, RFI filters, voltage match for long servo leads (110" EF Yak has 54" long elevator servo extensions!) and you can't beat the reliability. Plus I can fly for a year on a single charge! Actually I will change to the smaller 2900 mah redund. batts to save about a few oz. and still have plenty of power.

Made a little progress with stabs and will start the wings tomorrow. Waiting on parts to finish the fuse. Will post more pics tomorrow!

[Yakov]

	Quote: Originally Posted by The Flyin Hawaiian
	Yakov, If you already have an 88" EF Yak you would already know that the Gas tank CG issue is really not an issue. If you really wanted to install the tank above the wingtube, you probably could, since the canopy is very large, but I think it is not necessary, especially when there is already provisions for tank mounting built in the model.

No 88" but had the 68" and 87".

I am an IMACer not a Hucker so changing CG during a flight IS an issue for me.

If I go with a DA 85 and Pitts muffler then I can put tank in the tunnel and have it over CG.

[Yakov]

Rennie,

I see by your Rx that you have a JR 9303 2.4Ghz radio, me to. I just made the switch from a Futaba 9Z WC2. Man the 9303 is WAY easier to program.

[The Flyin Hawaiian]

Yakov, I love the JR 9303. I have had two 72mhz versions and now the 2.4G version. It was easy to transfer info from one Radio to the other, programmaing is very easy, and with the JR 9 channel 2.4G receiver, you get full 2048 resolution. Its is almost like you are directly connected to the airplane. I noticed that right off. Especially when I was doing rolling harrier circles, they were really tight circles even though I was trying to do a large radius circle. Thats when I realized that there was more of a lag time w/ the 72mhz than the 2.4G.

I see that you avitar you have avery nice looking Yak. Sometimes changeing CG is as easy as just changing or taking off the spinner. I am going to set up my new 110" with a black anodized Tru-turn spinner then to get more 3D capable, I will just remove the spinner or change it to a Carbon fiber lighter spinner.

On my 88" yak even though the tank is in front of the wing tube, the depleting fuel tank does not effect the flight quality very much. I know the 110" will awesome!

[Tim F.]

Rennie, what header drop did you get? I am going to get a set ordered but wasnt sure on the drop.

[The Flyin Hawaiian]

	Quote: Originally Posted by Tim F.
	Rennie, what header drop did you get? I am going to get a set ordered but wasnt sure on the drop.

50mm drop is what I calculated. Measured from exhaust port to center of tune pipe tunnel.

[STLAV8R]

WOW! 54" long elevator servo extensions for a 100cc plane.
What brand servo extensions did you use, or did you make them up yourself?
What is the length of the fuselage?