danielwidman79

Hello
Shuld i buy a DA 100 or 85 to planes like Extreme Flight YAK, QQ YAK and Wildhare Extra 35%

Best Regards

SinCityJets

100....easy decision

plaster93

My Feedback: (20)

3w 106

RC-3D

My Feedback: (4)

DA 85 if you can keep the weight below 24 lbs

Tired Old Man

My Feedback: (1)

The Wild Hare performs best with the 85. It keeps the weight down. A larger engine equals more weight, which requires the larger engine to carry it. Aircraft performance increases significantly at lighter weights. Vertical is just fine so don't let anyone B.S. you that the 85 won't be enough.

EF planes seem, in reality, to weigh in about the same as Wild Hare in the same size ranges. Keep that in mind when you choose an engine. Of the four 100cc engines I own, the 3w 106 is by far the heaviest. Good engine, but fat. Get one if you think you'll need lot's of nose weight.

dbcaster

I have a 37% BME Ultimate weighing 27.5 lbs. with a DA 85. The plane has plenty of power and good pullout out of a hover. I would say if you want light wing loading you could put the 85 in just about any 35% airframe. However, it looks like the EF Yak will be on the large/heavy side so I would say you would be better off with either a 3W 106 or a DA 100 on tuned pipes.

JEFFRO503

My Feedback: (9)

If you go with a 100.........you'll make a mistake! Most guys whom own the 100 will tell you different , because they have to defend their motor. The reality is , the 85 outperforms in HP to weight ratio on any given day!

Look......the 85 is 1.73lbs lighter than the DA-100 , and on "stock" exhaust it puts out only 5% less HP than the 100. And then if you want to run a canister , or even better yet a Tuned pipe on the 85.........HAHA , the 100 won't hold a candle to it in power , and you'll still be waaaaayyyy lighter. There are a few threads around here that will prove this to be true. IN FACT , some of the numbers on the RPM's off the 85 with a tuned pipe are really close to what the 3W 106 puts out. And the 106 is a BEAST of a motor , but about 2-1/2 to 3 lbs heavier than a DA-85. ( even heavier than a DA-100 by quite a ways )

And oh yeah.......you save yourself about $500.00 with going with the DA-85 compared to the 100 , and only having to buy one header and one canister.

I'm building a WH 35% Sukhoi with the DA-85 as my choice. I have seen threads of guys having these things on 26-27lb airframes and they fly flawlessly.

Josey Wales

My Feedback: (61)

I also vote for the 100...and I don't own one either.

niteman

Hi Daniel,

I own the DA 85 and the power is truly amazing really and I would have agreed with the other posters and said definitely save the weight and go with the light wing loading, however I just pre-ordered one of the "new" 6 oz lighter and a little stronger (H.P.) 100's. Give DA a call and they can give you the details of its improved performance.

The other big thing to consider aside from comparing the new 100 with the 85 is whether or not your plane "needs" the little extra weight of the 100 (which is why I ordered one) to balance without loading the up the motor dome/box with radio gear like I and others had to do on the Comp Arf Extra 260 2.6 (35%) who have used the DA 85 and ZDZ 80's.

I am building the AW Yak 33% QB to put my light 85 and in and I will be putting the 100 when I get it in my compy and moving all of the radio gear out of the frik'n canopy/firewall area to inside the fuse where I feel it really belongs to be. Especially the RX batteries.

Hope this helps. Dan Happy Easter Everyone !!

Josey Wales

My Feedback: (61)

Niteman---how does your 85 compare with your 100 with regards to vibration, transition, and idle ? I don't own a 100 but have seen and flown enough planes with them to know its a awesome engine..smooth and very little vibration. Just wondering how the big single stacks up.

dbcaster

If you don't own one how can you actually say the 100 is better?

Josey Wales

My Feedback: (61)

Just because I don't own one doesn't mean I've never flown any planes that didn't have them for motors.

dbcaster

One issue I can see with the 85 is noise. The DA 85 seems to be the loudest gasser out there at this point. I have been told that I need to do something to reduce the noise of my plane at a field that has no noise restrictions. It seems as though the KS canister is not performing very well as far as rpm jump and the wrap around pitts are extremely loud. I think the only thing that is performing well with lower noise is a 1090 pipe but that can be a challenge in some airframes. I just can't figure out why DA does not actually make a muffler for their own engine?

dbcaster

So you have flown planes with the 100 and the 85?

Josey Wales

My Feedback: (61)

Nope--but the 100 is a proven engine--the 85 is still pretty new.

niteman

Hey Josey

Its been awhile how's it goin?? The 85 if dialed in correctly. and I mean from proper engine mounting/transfer, prop/spinner balanced and drilled correctly, carb adjusted right, canister/pipe supported correctly etc, etc,....... then and only then I can honestly say the 85 is as smooth as most 100's I've seen. The 85 is a great engine. Starts on 2 or 3 flips everytime for me.

The bottom line is there is not as much room for forgiveness setting up a big single as there "seems" to be with the twins which have counter-balance working for them if you want LOW vibration. Devil is in the details !!

My 85 is as smooth as a baby's a**, but I really followed this advice.

Josey Wales

My Feedback: (61)

Been goin' pretty good---Hope things are good with you too..

Thanks for the comparison..Thats what I was thinking also. Im curious to see how the updated 100's will stack up..Ive only seen 3 big singles before and they were pretty rough with the vibrations. From the few vids Ive seen of the 85 it definitely seems a lot smoother than those.

dbcaster

I think it really comes down to what type of flying you want to do. For me I would rather fly a plane with 2 lbs. less weight with a lighter wing loading. I will give up a little power for better wing loading. Someone else may prefer more power and not care about the extra weight. You are correct about the 100 being more proven and it definately has better options for less noise. The new 100 may be a bit better but it does not seem like there has been a lot of change with it. I really don't think you can go wrong either way and I think once the new 100's come out there should be some good deals on used 100's.

Josey Wales

My Feedback: (61)

Im not concerned about the weight as much as how smooth it runs...Lighter is always better of course but sometimes you need to give something up to gain something else...Id rather give up some weight for a smoother running motor that wont shake the plane, servos, and electronics to death...

dbcaster

Truely you don't need to worry about that with the 85. It is as smooth as my DA 150 and has the best throttle response of any gasser I have had. The only real downside I can see at this point is the noise.

Josey Wales

My Feedback: (61)

Well thats good to hear--noise is not an issue for me

niteman

Hi Dbcaster,

Even if DA made a muffler for the 85 it would prolly be a screamer as well like their other ones.

I think the quietest setup out there for the 85 is using the MTW 110K on a Mejz 26 x 12 and with no mid range tuning worries either.

The 110k can does give the extra rpm boost for the added weight of itself and 26 x 12 pulls a little harder, but is quieter IMO.

OR go with the "torqy" 24 x 12 - 3 blade and keep it quieter yet.

JEFFRO503

My Feedback: (9)

You know after i posted that last post , i want to retract a little of it. I mentioned you would be wrong getting the 100........that's not the case. You really can't go wrong with either engine you choose if it's a DA. They have proven themselves as being a very dependable brand of engine , and it actually boils down to preference on what your looking for. If "YOU NEED" the extra nose weight ( which some airframes do) then most certainly go with the 100.....especially the new 100 that's coming out. Or if you want something with less weight go with the 85.

But honestly the price difference of damn near $500.00 between the two setups with canister exhaust......it's really , really hard to pass on a DA-85 setup.

Josey Wales

My Feedback: (61)

Yea I agree that both would probably be good choices..Im not really in the market for one just yet but I like to learn as much as I can. Ive never messed with pipes or cans before so I like to stay with stock setups whenever possible.

jsm77777

My Feedback: (4)

I would ONLY use the 85 if I wanted the lightest engine for a given airframe. I will stick with my 100, and 150 twin cylinder engines. Smooth, powerful, and reliable. I also hear that the 85's are running hot, and overheating, and it makes sense since the smaller engine will have to work harder compared to the 100. Nuff said for me. Scott