Pilot-R/C 35% Yak

[rcmaster12]

Hi All, I am looking into getting a 35% yak 54 by Pilot-rc. I was thinking about putting a DA-85 in it to keep weight down. I will also be using 9156's all around with one on each wing as this is an option. Also, a spektrum AR9100 with 2 A123 batts will be used as well. I would like some input on whether the 85 is even a good choice as I have seen some controversal thoughts and also whether to use cans or not. I would like to go with the slimline pitts style for weight savings but cans for the quiteness. Any input would be appreciated.

Thanks,
Alex

[gapple12]

If you keep it light, the 85 will pull it around regardless of what exhaust you use. I would go with a pipe just in case you need some more juice.

[rcmaster12]

I was hoping for that! Would the canister really add that much more power?

[Show871]

I realise I might get some crap for sayn this but man just go with a 100 twin. I had a well tuned 85 in a 33% yak and if literally destroyed the airframe because of the vibration. mufflers crackn....blah blah blah. I had the m box all carbon fiber, HD firewall etc. With the 100 twin I cant even see my servo wires move! So smooth and powerfull. The pilot yak will still be really lite with the twin, and be powerfull, reliable, and your airframe wont vibrate near as much. Some people have great luck w the 85, but many have had the same experience as me. good luck 871

[adrian]

	Quote: Originally Posted by Show871
	I realise I might get some crap for sayn this but man just go with a 100 twin. I had a well tuned 85 in a 33% yak and if literally destroyed the airframe because of the vibration. mufflers crackn....blah blah blah. I had the m box all carbon fiber, HD firewall etc. With the 100 twin I cant even see my servo wires move! So smooth and powerfull. The pilot yak will still be really lite with the twin, and be powerfull, reliable, and your airframe wont vibrate near as much. Some people have great luck w the 85, but many have had the same experience as me. good luck 871

agree 100%

[gapple12]

Well, I have noticed on my 85 that there is ZERO vibration. It will idle so low and smooth that you can almost read the prop, and its quite. Now, I am running a pipe, so maybe some of that vibration is absorbed by the pipe, header, mounts, etc....etc..... Not sure, but I love it once I got it dialed in. You can not go wrong with a 100 though. I only saved about 12 ounces from the 100 to the 85 when you add up pipe, header, coupler, springs, and mounts. Hope this helps.....

[epc2]

IMHO , I don't see the advantage of running an 85 with pipe etc instead of a 100 with Std mufflers , when you add the weight of the pipe ,headers,couplers, clamps and mounts I'm sure there's not much weight and $$ savings , and the twin will turn a bigger prop and run way smoother.

My 2 cents.

Thanks,

epc2.

[heligrom]

	Quote: Originally Posted by epc2
	IMHO , I don't see the advantage of running an 85 with pipe etc instead of a 100 with Std mufflers , when you add the weight of the pipe ,headers,couplers, clamps and mounts I'm sure there's not much weight and $$ savings , and the twin will turn a bigger prop and run way smoother. My 2 cents. Thanks, epc2.

Robert vess did a whole thread on this using Extreme flights' 100CC yak. They did a build with an 85 on can and a 100 on standards. Lemme see if i can find the thread

[torquen]

100% go with a 100 plus cc engine. I have this plane and am running the 3w 110. The plane is a rocket ship but needs the torque of a big prop to get it moving. An 85 will fly it fine but will never come close to touching my plane in a vertical drag race. The plane has a ton of wing area and will fly extremely lite. Remember that this airframe is huge and has a lot of drag.

You will be making a mistake using a 85. 85's are better left to the smaller 35% or 33% airframes. Flame away I don't care one bit But don't cry when my plane smokes yours pulling out of a hover.
Garrett Morrison

[rcmaster12]

Thanks guys I've also done some reading on RCU and it looks like the 100 is the way to go. My next question is what should I use for exhaust. Should I go with stock slimline pipes or get cans. Im not really looking for a power advantage, so no tuned pipe. What I am looking for is what is the sound difference betwwen the two. Are stock mufflers noticably louder like day nd night?

Thanks,
Alex

[Big A]

I have flown, several (85 vs 100cc+); more than just smooth engine. The sound of a twin alone is also an added bonus. I would vote twin.

Big A