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DA-85/ Extra

Old 12-25-2007, 11:03 PM
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bgold
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Default DA-85/ Extra

I'm interested in getting an Extra and powering it with a DA-85. Am I going to have to use a 33% Extra or will this engine really pull a 35% Extra for IMAC and/or 3D.

Bill
Old 12-25-2007, 11:22 PM
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Default RE: DA-85/ Extra

The popular trend is to use the 85 for 33%. Use DA 100 for 35%. The two are very close in power to weight ratio, so there are many variables in the aircraft build/setup that will determine the best use of each engine. If you set up the 35% to be very light and ran a tuned pipe it would be fine. The difference between the two scales will be about 3-4 lbs.
Adam
Old 12-26-2007, 01:27 AM
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Default RE: DA-85/ Extra

Old 12-26-2007, 08:17 AM
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Tired Old Man
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Default RE: DA-85/ Extra

Wild Hare has been using the DA 85 on their newly released 35% Extra and Edge and it's working just great for any type of flying. I suppose the plane itself has quite an influence on the engines ability to do the job. As in anything else, all up weight makes the decision.
Old 12-26-2007, 08:33 AM
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Jake Ruddy
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Default RE: DA-85/ Extra

It's really going to depend on the weight of the plane and how much 3D performance you require.

The 85 is going to save you over a pound (and some money) so if the plane you are looking at comes in 27-28 pounds with a DA 100 stock.. you could get an 85, spend some money on CF tubes and probably be close to 26 pounds.. 85 will fly that well.
Old 12-26-2007, 09:36 AM
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Default RE: DA-85/ Extra


ORIGINAL: Jake Ruddy
The 85 is going to save you a pound (and some money)
Not to pick nits, but the DA-85 is 1.5 lbs lighter than the DA-100...


Old 12-26-2007, 10:20 AM
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Default RE: DA-85/ Extra


Not to pick nits, but the DA-85 is 1.5 lbs lighter than the DA-100...
It's more than a nit. Also if you plan to use canisters the 85 saves another 5 oz., and the actual weight difference between the 85 and the 100 is 1.7 lbs. by my scales.

Total weight savings with the 85 and canisters is almost 2 pounds, and the power difference is less than 5 percent.

In my testing I find that the plane's power performance (climb, pullout, acceleration) is about the same while losing 2 pounds makes the flight envelope a lot larger and saving $500 makes me smile.

TF
Old 12-26-2007, 11:33 AM
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Jake Ruddy
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Default RE: DA-85/ Extra


ORIGINAL: Torqued-Up


ORIGINAL: Jake Ruddy
The 85 is going to save you a pound (and some money)
Not to pick nits, but the DA-85 is 1.5 lbs lighter than the DA-100...


Not nitpicking at all. you are correct

Sorry.. I meant to say "over a pound" I couldnt remember the exact number off the top of my head
Old 12-26-2007, 12:25 PM
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Default RE: DA-85/ Extra

After having the benefit of flying the exact same airframe with a 3W 106QS, DA-100, BME-115 and DA-85, the DA-85 was the best selection by far... Removing weight is like adding horsepower, not to mention the lighter wing loading...

IMHO, if a DA-100 will haul it around, the DA-85 will do it better...
Old 12-26-2007, 09:24 PM
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Default RE: DA-85/ Extra

Just as stated in post #2. The power to weight is very close between the DA 100 and the DA 85. 1.68hp/lb fro the 100 and 1.90hp/lb for the 85. The power output felt is about the same and the plane should only have flew lighter. Hover pullout should have been very similar assuming both were tuned perfectly.
Old 12-27-2007, 07:02 AM
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Default RE: DA-85/ Extra

If it were in your shoes i would get the DA-85
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Old 12-27-2007, 11:06 AM
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Default RE: DA-85/ Extra


ORIGINAL: rctom


Not to pick nits, but the DA-85 is 1.5 lbs lighter than the DA-100...
It's more than a nit. Also if you plan to use canisters the 85 saves another 5 oz., and the actual weight difference between the 85 and the 100 is 1.7 lbs. by my scales.

Total weight savings with the 85 and canisters is almost 2 pounds, and the power difference is less than 5 percent.

In my testing I find that the plane's power performance (climb, pullout, acceleration) is about the same while losing 2 pounds makes the flight envelope a lot larger and saving $500 makes me smile.

TF
Tom,

What do you have for the weight of the headers and the cans for the DA100?

I've been trying to find that number for a while vs the weight of the stock mufflers.

Thanks!
Old 12-27-2007, 11:27 AM
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Default RE: DA-85/ Extra

So the DA 85 is lighter than the BME 115????? It's hard to believe that the little difference in weight between those two can make the DA 85 better. Without a doubt the BME puts out waaay more power at about the same weight. Hmmmmm.
Old 12-27-2007, 11:57 AM
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Default RE: DA-85/ Extra


ORIGINAL: marzo91

So the DA 85 is lighter than the BME 115????? It's hard to believe that the little difference in weight between those two can make the DA 85 better. Without a doubt the BME puts out waaay more power at about the same weight. Hmmmmm.

Not going to start... Not going to do it... No thousand points of light... No ROI...

Although the BME 115 is a powerhouse, it is not without it's problems, which have been discussed ad nauseum on various internet forums... The most serious issue is that BME apparently is no longer in business... That, coupled with the FACT that they are difficult to tune without a bunch of chicken bones and a voodoo witch-doctor all factor into my response above...

If you fly above half-throttle all the time, then the BME might be for you... If like me, you need a "delicate" throttle curve / transition between idle & half-throttle, then IMHO the BME isn't going to do the job...

Old 12-27-2007, 01:28 PM
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Default RE: DA-85/ Extra

It all depends on what carb you use. Not saying there isn't problems, but they can be made to run just fine. The biggest problem now is that BME is OUT OF BUSINESS and there is no word if anyone is going to pick up his line of engines
Still,,, there is no way in h$ll that the DA85 (even on a pipe) will come close to the 115 on stock mufflers. What does the 85 weigh?? The 115 is 4lbs 6oz less ignition & mufflers.
Old 12-27-2007, 01:38 PM
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Default RE: DA-85/ Extra

DA-85 - 4lbs 5oz
JTec Pitts Muff - 9.8oz
Old 12-27-2007, 01:43 PM
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Default RE: DA-85/ Extra

When you guys are saying the 85 will perform the same as a 100--are we talking both motors on stock mufflers ? Or do you need to get a pipe for the 85 to compare to the 100 ?
Old 12-27-2007, 01:45 PM
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Default RE: DA-85/ Extra

From what I have read you need a pipe & some say it is the same, others say it is not equal to a DA100 on stock mufflers.
Don't forget those ES composite pipes weigh nothing and put out the ponies.
Old 12-27-2007, 02:03 PM
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Default RE: DA-85/ Extra

Thanks--anyone have an links to some vids ?
Old 12-27-2007, 02:48 PM
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Default RE: DA-85/ Extra

How about the BME 110? It seems there were fewer problems with the 110. The reason I ask is because I have a BME 110. Do you think I need to sell the 110 and get the new DA 85?
Old 12-27-2007, 03:02 PM
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Default RE: DA-85/ Extra

The market value for BME's will probably be VERY low unless someone picks up the line. The 110 is stronger than the DA 100
So.........you might want to run it until it dies, then move on.
Old 12-27-2007, 03:09 PM
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Default RE: DA-85/ Extra

What do you mean by pick up? BME still sells and services their engines.
Old 12-27-2007, 03:18 PM
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Default RE: DA-85/ Extra

ORIGINAL: marzo91

What do you mean by pick up? BME still sells and services their engines.
From what has been relayed to me (since Keith will not respond to my e-mails) BME is no longer in business. He will fix what he has been sent but then it is over, done, fineto.
There is one other guy on another forum that will do basic repairs and has a modified carb block for people running the WB carb and having mid range richening problems.
I have also heard a group might be looking into acquiring the company, but that is all speculation at this point.
Old 12-27-2007, 03:55 PM
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Default RE: DA-85/ Extra

POST 11................................................ .........
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Old 12-27-2007, 06:20 PM
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Default RE: DA-85/ Extra

I never implied the DA-85 makes anywhere near the power of a BME-115... The 115 makes WAY more power...

I believe the comparison that is being made is between the DA-100 & the DA-85 based on the weight savings provided when using the DA-85...

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