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  
Dean Sarelius07/08/2019 09:03:23
23 forum posts
20 photos

Also

Just doing a dry fit with the motor mounted and the tail parts in place and the CofG is spot on which has got me really worried as I don't have a battery fitted as yet..?

Guess I will be having to add some extra weight into the tail when I go to fit it out with the electrics or perhaps a smaller battery.?

img_20190807_171838.jpg

Martin McIntosh07/08/2019 10:10:10
avatar
3412 forum posts
1202 photos

With the servos as far back as possible, just in front of the wing bolt plate, the battery on mine is more or less over the cg. This is with a 2200, but a 3000 will make it a tad nose heavy. Remember that the covering will move the cg rearwards.

Dean Sarelius07/08/2019 10:37:29
23 forum posts
20 photos

Thanks Martin,

I plan on doing the covering and final assembly next week so fingers crossed.

I really hate adding weight so will also consider to cut out the bulkhead for the motor and move the motor closer to the wing but I guess that could be a little drastic.

Dean Sarelius07/08/2019 10:49:41
23 forum posts
20 photos

Hi Martin

Also did you make some small cut outs on the wing for the servo leads..?

kc07/08/2019 11:22:36
6507 forum posts
173 photos

You might only need 1 cutout for both servo leads. The leads can be inserted by first putting something like 'snake' inner through the middle hole with thin string attached and getting the string into the servo area, then pulling the string back with the servo lead ( or extension lead) attached.

The covering material, undercarriage, tailskid, clevis etc might all affect the balance when installed so it's too early to tell, but provision for several positions for battery is a good idea. But if needed just a tiny bit of lead at the tail can adjust due to the leverage.

Peter Miller07/08/2019 11:52:19
avatar
11078 forum posts
1308 photos
10 articles

Yes, otherwise how do you get the leads to the Y lead?

This was wrtten before I realised I was on a previous page

Edited By Peter Miller on 07/08/2019 11:54:40

Peter Miller07/08/2019 11:55:52
avatar
11078 forum posts
1308 photos
10 articles

I had to add some weight at the tail which was one reason I suggest solid tail surfaces.

Martin McIntosh07/08/2019 14:46:54
avatar
3412 forum posts
1202 photos

Dean, just build it as per plan and it will be fine. I would assume that you will use two aileron channels so a cut out either side of centre will be the obvious thing to do. Fit the drawstrings before covering the wing.

Dean Sarelius23/09/2019 22:59:44
23 forum posts
20 photos

Hi Everyone,

Thought I would share the pictures of the Ohmen.

Just on the last leg of setting up, waiting for the battery (2200mAhr, 11.1V, 30C) and new push rods to arrive before completing the assembly and testing.

img_20190922_162722.jpg

img_20190922_162846.jpgimg_20190922_162732.jpg

Chris North 324/09/2019 05:26:26
avatar
320 forum posts
512 photos

Looking great

Peter Miller24/09/2019 08:15:43
avatar
11078 forum posts
1308 photos
10 articles

That is very smart. I will look forward to your flight report

Martin McIntosh24/09/2019 09:32:06
avatar
3412 forum posts
1202 photos

Very smart looking job there.

Nigel R24/09/2019 10:35:38
avatar
3894 forum posts
678 photos

Very tidy. Like the red nose and the trim lines.

Dean Sarelius24/09/2019 14:11:40
23 forum posts
20 photos

Thank you everyone for your positive feedback.

The only mistake I made was with the undercarriage so had to peel off the film and cutaway into the fuselage to fit some extra ply mounts. For most of my build it always seems to be the undercarriage that creates the most grief. I couldnt even find the right wire so ended up picking some up at the local scrap metal yard and when I went to purchase the rods he wasnt sure if they were aluminium or magnesium. I guess if they are magnesium and if it should go down in flames then it should be quite visible ha ha.

Cheers

Geoff Gardiner06/10/2019 21:03:29
avatar
541 forum posts
914 photos

Hi Dean.

I have sent you a PM.

Geoff...

chris larkins08/10/2019 03:41:37
avatar
212 forum posts
151 photos

Dean, I have also sent you a PM.

chris larkins08/10/2019 03:45:00
avatar
212 forum posts
151 photos

Has anyone done one of these as I.C ?

I quite fancy one powered by an O.S FS-26 4 stroke.

Peter Miller08/10/2019 08:47:40
avatar
11078 forum posts
1308 photos
10 articles

A 26 Four stroke would be perfect. Go for it!!!

But keep it light

Edited By Peter Miller on 08/10/2019 08:48:19

Geoff Gardiner08/10/2019 11:47:18
avatar
541 forum posts
914 photos

Hi Peter.

I am thinking about building one of these in order to take my B test with, do you think it would be suitable?

Many thanks

Geoff...

Peter Miller08/10/2019 11:55:38
avatar
11078 forum posts
1308 photos
10 articles

Hi geoff.

The OHmen is very aerobatic but can be flown with precision so I would say, YES it would be fine.

All Topics | Latest Posts

Please login to post a reply.

Latest Forum Posts
Support Our Partners
Sussex Model Centre
electricwingman 2017
Slec
CML
Sarik
Advertise With Us
Latest "For Sale" Ads
Has home isolation prompted you to start trad' building?
Q: The effects of Coronavirus

 Yes - for the first time
 Yes - but Ive bashed balsa before
 No - Ive existing projects on the bench
 No - Im strictly an ARTF person

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us

Magazine Locator

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

Find RCM&E!