Author Topic: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)  (Read 1864 times)

Offline KeithLuneau

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I'll soon start converting this one to big brushless and lipo power, to replace the current Homelite engine. The engine is a converted chainsaw engine, 26.2cc from an old XL saw. It's a load of fun but it's beating the plane to pieces, so electric power it will be. I've got a list of parts together to order, I should be able to get it done for about $200 give or take.

I'll post here as I make progress with it, just wanted to start with a few pictures now, and a video I made when I first got it in the air. ;)









I'll order the stuff for the conversion next week from HobbyKing, so I'm looking at a couple weeks or more before I can start to actually work on it. :(

Offline KeithLDick

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #1 on: October 23, 2010, 08:12:03 AM »
Very Cool Mod...  I got a Four Star 40 that had a crappy 4-stroke Magnum XL .52 in it and it would barely get off of the ground so I put a O.S. .46 AX in it now it kicks butt... hehehe

Offline KeithLuneau

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #2 on: October 23, 2010, 08:23:20 AM »
I flew a Four Star 60 a while back at a flying field and loved it! I learned to fly with a Sig Astro Hog that had a O.S. .91 four stroke, and man was that one nice! :) I sold it, and regretted it ever since. This big Four Star flies so nice though. I kinda wish I'd gone with the 60 though. I got the big one just so I could use the Homelite since I already had it. If it were a kit it would have been simple to build it strong for the engine, but this one was the ARF. It's already got stress cracks in the canopy from the vibrations, and the firewall is starting to separate from the fuselage sides! I've only got about 5 flights on it too.

Offline KeithLDick

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #3 on: October 23, 2010, 09:05:02 AM »
Man that sux....

I sold my Rascal 40 the other day and I had never flown it...  The guy fly's it for the 1st time and has a bit of a hard landing and the Landing Gear brace in the fuse broke, he says they used "Monkey Wood" instead of plywood on the brace... hahaha

It was an older ARF, but he says it would be a quick fix and it didn't even tear the Monocote so that's cool... It sure did fly nice tho....  :220:

Offline KeithLuneau

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #4 on: October 23, 2010, 09:13:16 AM »
Yeah, Sig does have some awesome designs! I think their ARFs are a little lower quality than their kits though. This one actually had papers in the box where it came from World Models. My guess is they're building the ARFs for Sig, and Sig markets them here in the US as their own products, when truthfully it's only their design... ;) I could be wrong though!

Offline pinguin6218

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #5 on: October 23, 2010, 09:59:22 AM »


I'll order the stuff for the conversion next week from HobbyKing, so I'm looking at a couple weeks or more before I can start to actually work on it. :(

Nice flying  :130:


That sun is really killing my eyes
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Offline KeithLuneau

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #6 on: October 27, 2010, 11:52:29 PM »
Just a small update... I've got most of the parts on the way now. (Motor, firewall mount, prop, ESC, battery, BEC, battery for the BEC, etc.) I'll still need a cowling to cover up the motor later, but there's no rush for that. I'm also not sure what I want to do for a battery tray. Depending on CoG and where the battery ends up, I'll either have to remove the wing to get to it each time, or cut a hatch on top in front of the canopy if I need to slide the battery up there where the fuel tank currently is. I guess I'll just have to wait and figure all that out! ;)

Parts should be here in a week or two, however long it takes for EMS shipping from Hobby King. ;)

Offline KeithLuneau

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #7 on: November 01, 2010, 04:23:45 PM »
Small update...

I ordered everything last week from Hobby King, all except the ESC which is out of stock. I waited too long... lol I ordered an 80 amp Hobbywing ESC though, from Hobbypartz. Shipping from Hobby King is EMS, from Singapore so it'll probably be a little slow, but it'll get here eventually!

I've already pulled the Homelite engine off the plane and repaired the damage around the firewall from the vibration, and ordered a new canopy which was also breaking up from the vibration! While I was at it I ordered a fiberglass cowling from Fiberglass Specialties.

Here's the plane as of this morning:


Here's the cowling that I just got in the mail:

Offline KeithLuneau

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #8 on: November 04, 2010, 02:00:11 PM »
Just a small update... I got the canopy in the mail yesterday, and trimmed it and cowling up last night, painted them, and glued the new canopy on. I finished the cowling up this morning, so here's some pictures...

The other parts should be here soon, they've already made it to the US and cleared customs, won't be long now! I'm hoping either tomorrow or Saturday!

Not perfect, but not half bad either! :D I used some servo mounting grommets through the cowling, with washers on the inside. Gives it a nice cusioned mount!





You can see here the 3 holes where the old canopy screwed on... Apparently the ARF and kit canopies are not the same. This new one fits the fuselage way better! It's glued on with canopy glue, and I also added a few tiny screws in it for extra measure. I'd hate to loose it in flight! The darn thing cost me nearly $30 after shipping and paint... lol

I need to get some trim tape or something and cover those holes up.



Will update more when I get more parts!

Offline jdr00ejr

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #9 on: November 04, 2010, 02:14:27 PM »
Keith,

Sweet Bird!  I was struggling to get a size idea until I saw it beside your PC (that's speaking my langauge).  That thing is huge!  That's got to be loads of fun but I'm assuming you need a big ride to transport to and from the flying field.

I've avoided Gas/Nitro RC at all cost (both land and air) and think it's very cool that you are converting such a large plane to Electic.  Because of my ignorance in the area I have a question:  How will you know how long you can fly before needing to land (and still have safe battery left)?
Joshua
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"Trust in the Lord with all thy heart and lean not on thine own understanding.  In all thy ways acknowledge Him and He shall direct thy paths."  ~Proverbs 3:5-6
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Helis --> Syma S-001 (Ignored), Pheonix Sim, Blade CX3/2/Lama V4 Mutt, Blade MSR, Blade MCX2 (Son's)

Offline KeithLuneau

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #10 on: November 04, 2010, 03:36:00 PM »
On all my planes, I just use the LVC (low voltage cutoff). When the battery is low, the ESC will cut power to the motor, or reduce throttle, depending on how it's set up. When power is cut, you can set the throttle stick back to idle and re-arm the throttle so you have power to make a nice controlled landing. I wouldn't recommend this on a heli though... ;)

I usually end up landing before the battery is that low anyway though, I tend to fly about 10 minutes at a time and have my fill. :)

No problem transporting either, I've got a 400' long "runway" right out in the back yard, that's surrounded by fields on 3 sides. I love living out in the country! lol It's not that bad to carry it in a vehicle though, the fuselage is the worst part, the wing splits in half. I used to have a Sig Astro-Hog that had a one-piece wing with 71" wingspan. That one was hard to haul around in my mom's Ford Escort! lol I ended up selling that one, but wish I had it now that I've got room to fly it!

By the way, maybe this will give you an idea of the scale... That's the wing on the wall above the monitors. The large monitor in the middle is a 28", the one on the left is a 22".


Offline dfarmercse

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #11 on: November 05, 2010, 05:25:02 AM »
Big Plane Keith,
Nice living out of town. I have a 300 ft runway and 250 acres of field around my house. No other house for 1/2 mile. Just walk out the back door and fly.
 :130:

Dave F

Offline jdr00ejr

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #12 on: November 05, 2010, 06:06:59 AM »
Keith,

Can I come be your best friend / neighbor?  :132:
Joshua
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"Trust in the Lord with all thy heart and lean not on thine own understanding.  In all thy ways acknowledge Him and He shall direct thy paths."  ~Proverbs 3:5-6
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Helis --> Syma S-001 (Ignored), Pheonix Sim, Blade CX3/2/Lama V4 Mutt, Blade MSR, Blade MCX2 (Son's)

Offline KeithLuneau

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #13 on: November 05, 2010, 08:06:57 PM »
Keith,

Can I come be your best friend / neighbor?  :132:

Only if you keep the grass cut on the runway/field! lol

I got a shipment from Singapore this morning, now the real fun can begin. :)





More details here - http://www.rcflighttest.com/home/2010/11/preview-of-things-to-come/

Offline pinguin6218

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Re: My Four Star 120, soon to go brushless. (Currenly powered by Homelite)
« Reply #14 on: November 06, 2010, 02:26:36 AM »
Looking good  :130:

I'm following the build or transformation
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