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RE: Baby Edge Build Thread - 2/7/2008 2:41:54 PM   
rctom



Posts: 5132
Joined: 5/8/2002
From: Flower Mound (near Dallas), TX, USA
Status: offline 		Without knowing more details about mounting the 3w 24 I'm hard pressed to provide any answers. I'd probably need to actually have one to work with before I could give you any meaningful guidance.

TF

(in reply to Brunito)
       Post #: 51

RE: Baby Edge Build Thread - 2/7/2008 5:57:08 PM   
AirTech



Posts: 405
Joined: 1/28/2004
From: Allen, TX, USA
Status: offline
quote:

ORIGINAL: sailing1

AirTech
Why don't you just remove all of that ballast from the rear of the plane and put you flight pack battery on a platform behind the canopy. It just seems really counter productive to carry all that extra weight around when you can use what you already have on board. I can send you a picture of my setup if you would like. My plane on an Evolution 26 GT is just over 10 lbs..

Sailing,
Right now there are only 2.75 oz. of weight left on the rear and to be honest I don't want to go to the hassle of building a tray behind the canopy. I have pull-pull wires, servo cables and the receiver antenna on that area and that’s going to be a lot of work. In any case both my batteries are LiIons which weight only 3.5 oz each, and that weight at that moment arm location may not be enough. Appreciate the suggestion anyway.

(in reply to sailing1)
       Post #: 52

RE: Baby Edge Build Thread - 2/7/2008 6:58:48 PM   
AirTech



Posts: 405
Joined: 1/28/2004
From: Allen, TX, USA
Status: offline 		Brunito,

Seem to me you are going to need some help from the folks at 3W (Dessert Aircraft). The good news is that a quick search on the net got me the engine manual from 3W Modelmotoren' Look under the DOWNLOAD tab and they have the english language manual for the 24 and 28 cc engine available. When browsing through the manual I noticed there is some type of factory motor mount available (see photo on page 5).

From the photos I don't see any reason why you shouldn't be able to mount the engine with regular standoffs, unless the standoffs are too large in diameter. Your best bet is to go to the website for Cactus Aviation . Under the Tech Info tab you will find a page with Engine Installation Photos that will give you some ideas. If you notice 3W engines are designed with the use of canisters in mind, and for that reason they are mounted mostly at an angle in the inverted position. That doesn't mean that you may be able to mount them in any other configuration, as long as you find the proper muffler.

You may want to give Bobby Wilson at 520-781-0087 or e-mail him at Bobby@cactusaviation.com with your question. I am sure he will hook you up with the correct engine mount attachment you need. Send me private e-mail with your phone number and I may be able to further help or give you some other suggestions. Good luck.

(in reply to Brunito)
       Post #: 53

RE: Baby Edge Build Thread - 2/7/2008 7:11:53 PM   
sailing1


 

Posts: 279
Joined: 8/17/2004
From: tulsa, OK, USA
Status: offline 		AirTech,
No problem. Had a PM from another member asking me to post the picture of my battery install so will do so. Like you I am also using a 3.5 oz LiIon receiver battery but am using a 4.8 NiMh for the ignition. As to getting weight to the back, I actually had to move my ignition pack to just behind the firewall to get things to ballance.

Attachments
Click to see fullsize image.
Click for fullsize

(in reply to Brunito)
       Post #: 54

RE: Baby Edge Build Thread - 2/7/2008 7:36:24 PM   
AirTech



Posts: 405
Joined: 1/28/2004
From: Allen, TX, USA
Status: offline 		Sailing,

Which engine are you using on the Edge? With the Evoultion 26 I have the ignition module behind the engine box first former and the ignition battery in front of the rudder servo. Otherwise the plane will be nose heavy.

On the other hand the platform installation looks like it willnot be that much problem to install.

(in reply to sailing1)
       Post #: 55

RE: Baby Edge Build Thread - 2/10/2008 12:58:47 AM   
AirTech



Posts: 405
Joined: 1/28/2004
From: Allen, TX, USA
Status: offline 		Just a note for the guys running the Evolution 26 on their Edge. I flew the Edge today with the smaller 12 oz. tank and that's plenty adequate for this engine. A 20 minute flight will consume less than 6 oz. and the CG is just about 1/8" further back (wet).

The only thing you'll notice is that the elevators have more authority, specially when the fuel is less than half tank. The upside to that is that at full rates waterfalls are just awesome.

(in reply to AirTech)
       Post #: 56

RE: Baby Edge Build Thread - 2/10/2008 3:02:01 AM   
sailing1


 

Posts: 279
Joined: 8/17/2004
From: tulsa, OK, USA
Status: offline 		AirTech,
I am also running the Evolution 26GT, version one. Mine has the side mount muffler which I guess could be a little lighter than your pitts style. I think we are using the same prop, an 18x6 Evolution wooden prop. My ignition box is mounted on the bottom of the engine box just behind the firewall and the ignition battery, a 4 cell NiMh is mounted inside the engine box at the extreme front, just behind the firewall. My spinner is light weight nylon with a lightened back plate (Great Planes I think). I am not using the wheel pants so that is a savings of 3 ounces and I do not use a choke servo so there is another 1-2 ounces. I also swapped out the stock tail wheel for a Sulivan one but think they are probably about the same weight.

It is strange that our balance is so different with the same engine. I just guessed at CG on my first flight and had the ignition battery back by the wing tube and the receiver battery at the back towards the rear of the platform and was way tail heavy. Talk about snappy--it pretty much flew in a harrier and was a bear to land. I then moved the ignition battery to its current location behind the firewall and moved the receiver battery to the front of the platform. That made the plane a little nose heavy but oh so much better on my nerves. After a couple more flights and experimenting with battery placement on the platform I now have the CG so that the plane will just nose down a little on a 45 degree upline.

I have also found the 14 ounce tank I am running to be more than enough fuel to fly 10-12 minutes with lots of reserve. This is my first experience with an Evolution engine or a gasser this small and I have to say I am really impressed with the engine and plane combination. My two concerns with this engine/airframe were balance and viberation and neither has proved to be a problem.

(in reply to AirTech)
       Post #: 57

RE: Baby Edge Build Thread - 2/14/2008 3:04:18 PM   
AirTech



Posts: 405
Joined: 1/28/2004
From: Allen, TX, USA
Status: offline 		Sailing,

I can't figure why the large difference in CG between your set-up and mine.

The Pitts muffler may be a couple of ounces in difference, I have True-Turn spinner on the nose and my ignition is a little further back than yours, so I'm puzzled.

I am going to experiment with moving the counterweight back to inside the stab tube. That should shave off a few ounces from that dead weight. In any case I am really happy as to how the plane flies right now and will like to fly it that way for a while to get more familiar. And you are right everyone at the club field thinks the Evolution is the perfect engine for this bird.

Good luck with your 'baby" and make sure to keep the right side up on landings.

(in reply to sailing1)
       Post #: 58

RE: Baby Edge Build Thread - 2/14/2008 3:23:18 PM   
vanguard



Posts: 259
Joined: 12/5/2001
From: Fairmount, IN, USA
Status: offline 		Hey Airtech,
I have sent you a couple of PM's. Please respond when you get time. Watched your video on the club website. The Edge looks like it flies really well. One of those might be a good home for my Brilleli 26. Not quite as strong as the Evolution but at the weight of one of those, it should handle it pretty well.
Mike

(in reply to AirTech)
       Post #: 59

RE: Baby Edge Build Thread - 2/14/2008 5:54:05 PM   
sailing1


 

Posts: 279
Joined: 8/17/2004
From: tulsa, OK, USA
Status: offline 		AirTech,
I thought of one other thing. I seem to remember you were using a Dubro anti vibration mount. I purchased one of these but it was almost 4 ounces heaver than the Hangar 9 adjustable aluminum one I ended up with. That could be a big part of our weight and balance difference.

(in reply to vanguard)
       Post #: 60

RE: Baby Edge Build Thread - 2/15/2008 8:43:24 PM   
AirTech



Posts: 405
Joined: 1/28/2004
From: Allen, TX, USA
Status: offline 		Vanguard,

I did reply to your PM a few days ago, don't understand why you didn't receive my reply. Regarding the LiIon charging I do it with the batteries on-board and use 700mah to re-charge the 2300mAh packs.

You will not be disappointed with the baby Edge or for that matter the Extra. The Brillelli 26 should be a good match for either one, it may even balance a little better since I believe they are lighter than the Evolution.

I'll send you private mail to see if it works.

(in reply to vanguard)
       Post #: 61

RE: Baby Edge Build Thread - 2/15/2008 9:04:32 PM   
AirTech



Posts: 405
Joined: 1/28/2004
From: Allen, TX, USA
Status: offline
quote:

ORIGINAL: sailing1

AirTech,
I thought of one other thing. I seem to remember you were using a Dubro anti vibration mount. I purchased one of these but it was almost 4 ounces heaver than the Hangar 9 adjustable aluminum one I ended up with. That could be a big part of our weight and balance difference.

Sailing,
I am using a great Planes nylon mount for 1.20-1.80 size engines. That mount may be the same or slightly less weight than the H9 aluminum one. A real puzzle that I can't figure out. Wonder what other people baby's out there have ended up balancing with the Evolution 26.

By the way, just checked with Graphtech and the carbon landing gears for both the Edge and the Extra are available and ready for shipping.

(in reply to sailing1)
       Post #: 62

RE: Baby Edge Build Thread - 2/19/2008 7:06:04 PM   
Mikel-t


 

Posts: 335
Joined: 12/9/2002
From: Ellicott City, MD, USA
Status: offline 		Just a quick Q: before I make the plunge on the 260. Can I use my Zenoah G-26 w/ign from Ralph? my only other power choice on hand is Saito-150 ? so it's really a glow or gas question for the hardware purchase...for those running gas. Thanks in advance. Mikel-t.


_____________________________

Mike L
''The future?...well it ain''t what it used to be!"

(in reply to AirTech)
       Post #: 63

RE: Baby Edge Build Thread - 2/19/2008 7:47:19 PM   
rctom