By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

The Ohmen

My first electric powered aerobatic model

All Topics | Latest Posts

Search for:  in Thread Title in  
Peter Miller16/11/2018 08:24:35
avatar
9500 forum posts
1106 photos
10 articles

I have a collection of old aerial tubes and assorted K&S brass tubes up to 1/2".

For holes in ply formers I have some hole saws.

McG 696916/11/2018 09:53:09
avatar
2369 forum posts
974 photos

Hi to all,

If somebody is looking for some hole saw bits like Geoff showed, here's a link to AliExpress.

At just over €4,- including shipping, I wouldn't use them for marble, tiles or HS steel, but they're great for our balsa or ply jobs.

Cheers

Chris

Martin McIntosh16/11/2018 21:44:44
avatar
2591 forum posts
963 photos

After eventually negotiating the US post system of entering an address I got there in the end. Worth a punt at that price.

Dean Sarelius17/11/2018 08:43:51
3 forum posts

Hi Trevor,

I purchased the Chinese made K40 Laser cutter for AU$525 and am in the midst of doing all the recommended modifications like replacing the cutting table and adding the air assist to improve the cuts.

https://www.ebay.com.au/itm/40W-CO2-USB-Laser-Engraving-Engraver-Cutter-Woodworking-300x200mm-Movable-Wheel/192672721621?hash=item2cdc306ad5:g:vwEAAOSwIDZbOy1F:rk:19f:0

The 40 watt laser is perfect for cutting balsa and ply and the whole unit measures 800x500x300mm however you also need to take into account the added room for the exhaust and water tank for cooling.

What I like so much about the K40 is the ability to make improvements as it is well supported by a good maker community with a plethora of Youtube videos.

The only drawback is the cutting dimensions are only 200 x 300mm so for some larger parts I need to split them into two or even three sections.

Another good reason to have access to the laser cutter is if I smash the plane then it should be much easier to do a rebuild without to much angst.

I like the Ohmen as there is no need to produce any canopy or cowl molds for vacuum forming but should the need arise I also have access to a 3D printer.

I would look forward to share my DXF files with anyone wishing to use the K40 to do build off the plan.

If you think this could be of any benefit let me know and I will be sure to post them when I have finished the build.

Cheers,

Dean

Trevor Crook17/11/2018 10:52:07
737 forum posts
58 photos

Thanks for all the detail Dean. I haven't really got space for much in the way of bench mounted tools, so I'll probably pass this one by. Looks good for the more prolific builder though.

Geoff Sleath17/11/2018 11:37:49
avatar
3017 forum posts
247 photos
Posted by Martin McIntosh on 16/11/2018 21:44:44:

After eventually negotiating the US post system of entering an address I got there in the end. Worth a punt at that price.

When you get the tools, let us know how they work. Even in tile cutting

Geoff

Martin McIntosh17/11/2018 19:30:26
avatar
2591 forum posts
963 photos

For the Ohmen you just need a balsa knife, a David plane, a saw and some sandpaper.

Peter Miller17/11/2018 21:03:54
avatar
9500 forum posts
1106 photos
10 articles
Posted by Martin McIntosh on 17/11/2018 19:30:26:

For the Ohmen you just need a balsa knife, a David plane, a saw and some sandpaper.

It does help if you have a power fretsaw. But then I am lazy!

Geoff Sleath17/11/2018 21:39:22
avatar
3017 forum posts
247 photos
Posted by Peter Miller on 17/11/2018 21:03:54:
Posted by Martin McIntosh on 17/11/2018 19:30:26:

For the Ohmen you just need a balsa knife, a David plane, a saw and some sandpaper.

It does help if you have a power fretsaw. But then I am lazy!

I have that courtesy of Aldi (plus few beer tokens ) but I find I use my small Axminster band saw a lot more. The Aldi disc bench sander helps in correcting slight sawing errors too.

It's not laziness, Peter. It's being economical with effort yes

Geoff

Martin McIntosh17/11/2018 21:52:24
avatar
2591 forum posts
963 photos

I also use a scroll saw, not from Aldi but identical. Their sander is a great addition to my power tool kit as well.

Peter Miller18/11/2018 08:10:06
avatar
9500 forum posts
1106 photos
10 articles

Power tools are essential.

I don't have many, the scroll saw, a power drill,a couple of Dremel type drills and an orbital sander which I never use.

One of the ones that doesn't get a great deal of use but is a fantasic energy saver is my little Bosch power screwdriver.

I even use it for screwing on the wings of my models these days.

Edited By Peter Miller on 18/11/2018 08:11:10

Trevor Crook04/12/2018 21:41:51
737 forum posts
58 photos

Well, my Ohmen is ready to go - needs a spinner to finish it off and good weather when I have free time. Peter's pictures of his model reminded me a bit of a Miles Magister with those tandem cockpits. Hence, as I had plenty of Hobbyking yellow film and some leftover foamy warbird roundels, I've made a cartoon Magister

p1010431.jpg

p1010428.jpg

With a cartoon pilot of course!

p1010429.jpg

Here's the battery access. I've used a dowel at the front and magnets at the back. Trust me Peter, that hatch is never going to detach in flight, I can pick the model up by the headrest!

p1010430.jpg

The 2200 3s LiPo sits in front of the block of balsa on the back of the battery tray, held down by a Velcro strap. Power measurement gives about 400W, the model weighs 3lb (inc. battery) so it should go ok. Peter, the quoted weight in the article is 2lb 10oz. Is that sans battery, or have I just built heavy? I'm not too worried either way, there's plenty of wing.

Can't wait to try her, will report back when I have.

Peter Miller05/12/2018 08:19:25
avatar
9500 forum posts
1106 photos
10 articles

That looks really great!! Averythig is so neat.

No. My weight is ready to fly with battery. A 4 ounce variation isn't bad.

I will look forward to hearing how you like her. Miond you, looking at the weather for the next week it might be a little while.

Trevor Crook05/12/2018 13:07:29
737 forum posts
58 photos

Thanks, Peter. Yes, the forecast isn't great for the foreseeable future. I've no worries about the maiden, she looks right just like the Ballerina.

Ken Ball 105/12/2018 15:19:43
10 forum posts

Trevor Crook, where did you get the pilot, really like the look

Ken Ball

Trevor Crook05/12/2018 19:08:12
737 forum posts
58 photos

Ken, I knew someone would ask me that, and I can't remember. I think my father-in-law gave it to me ages ago, I'll see if he remembers. It may have come from some ancient Dick Dastardly model.

Trevor Crook06/12/2018 22:20:22
737 forum posts
58 photos

Well, I asked him and he thinks he picked it up in a charity shop - he always scouts the toy collection for potential pilots!

Peter Miller07/12/2018 08:58:47
avatar
9500 forum posts
1106 photos
10 articles

I must search charity shops more.

I do look around them. Once picked up a collectors camera for a tenner. sold it for £60. Usually I pick something up for £60 and only get a tenner!!!

Martin McIntosh08/12/2018 14:11:55
avatar
2591 forum posts
963 photos

Just received the AliExpress hole cutters which I have tried on birch and light ply. Pretty good at a little over £4 for ten assorted.

Trevor Crook10/12/2018 13:37:09
737 forum posts
58 photos

Maidened mine (shown above) this morning. As expected, no issues, she's a great flier. I've propped it for about 320W full throttle (12x7) and performance is good, just short of unlimited verticle. Take-offs can be done on little more than half throttle. Nicely aerobatic and a doddle to land.

Well done again Peter!

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E! 

Latest Forum Posts
Support Our Partners
electricwingman 2017
Overlander
Motion RC
Airtek Hobbies
CML
Slec
Wings & Wheels 2018
Gliders Distribution
Expo Tools 14 July
Advertise With Us
Sarik
Latest "For Sale" Ads
Which part of building a new traditional balsa aeroplane do you enjoy the most?
Q: Which part of building a new traditional balsa aeroplane do you enjoy the most?

 Research & choosing the model
 Building the fuselage
 Installing the engine and radio systems
 Building the flying surfaces
 Covering/painting/finishing
 All of it!
 None of it. I'd rather someone else did it!
 Other

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us