Hi All,
I recall the Sigma being discussed on the previous forum, but I haven't found any info this time round.
Just wondering if any members have any experience with the Sigma, particularly it's performance 'on the button'.
https://outerzone.co.uk/plan_details.asp?ID=3843
Thanks,
Sigma
- Wayne_H
- Posts: 812
- Joined: 17 Feb 2018, 05:26
- Location: Temora, NSW. Australia
- Contact:
Re: Sigma
Roger that!
I've already got the wing, so its just the remaining bits (and the box of course ). It will more than likely be another 'foamy' (nice & quick )
Thereafter, the only challenge will be finding a slope near our new town .
I wonder how it would go off a bungee.......
Cheers,
Wayne
Once a Retrobate, always a Retrobate............
Wayne
Once a Retrobate, always a Retrobate............
- Wayne_H
- Posts: 812
- Joined: 17 Feb 2018, 05:26
- Location: Temora, NSW. Australia
- Contact:
Re: Sigma
Well, a decision has been made
Rather than a strap on power pod, I'm going for a permanently mounted electric motor in the nose, with the power pack located on the CofG. As & when I find a slope, I can elect whether to remove the prop & use a smaller battery for just the Rx & servo(s) if conditions are light, or leave all "as is" in stronger wind conditions.
I've used this method successfully before on a variety of sailplanes up to 5m span.
I'll post updates as construction progresses, including details of the nose modifications.
Rather than a strap on power pod, I'm going for a permanently mounted electric motor in the nose, with the power pack located on the CofG. As & when I find a slope, I can elect whether to remove the prop & use a smaller battery for just the Rx & servo(s) if conditions are light, or leave all "as is" in stronger wind conditions.
I've used this method successfully before on a variety of sailplanes up to 5m span.
I'll post updates as construction progresses, including details of the nose modifications.
Cheers,
Wayne
Once a Retrobate, always a Retrobate............
Wayne
Once a Retrobate, always a Retrobate............
- Wayne_H
- Posts: 812
- Joined: 17 Feb 2018, 05:26
- Location: Temora, NSW. Australia
- Contact:
Re: Sigma
Preliminaries:
wing - already in one piece - is a Union foam job, suitably reinforced. It is almost a direct replacement for the original, simple enough to convert to 2 pieces with a carbon rod joiner. The chosen motor - a 2212 6T (2200Kv) - should go well on only 2 cells, using a Graupner folding prop pinched off an old S400 combo. The nose will need to be enlarged "slightly" to accommodate.
wing - already in one piece - is a Union foam job, suitably reinforced. It is almost a direct replacement for the original, simple enough to convert to 2 pieces with a carbon rod joiner. The chosen motor - a 2212 6T (2200Kv) - should go well on only 2 cells, using a Graupner folding prop pinched off an old S400 combo. The nose will need to be enlarged "slightly" to accommodate.
Cheers,
Wayne
Once a Retrobate, always a Retrobate............
Wayne
Once a Retrobate, always a Retrobate............
- Wayne_H
- Posts: 812
- Joined: 17 Feb 2018, 05:26
- Location: Temora, NSW. Australia
- Contact:
Re: Sigma
Managed to get a little time over the weekend to sort out the nose modifications:
All the bits have been printed out & glued onto cardboard for templates. The structure will be 2mm foam for the fuse (with strategic reinforcement) & the tailplane, while fin will be 4mm foam.
I bench ran the motor with a Graupner CAM 9" x 4.5" on 2 cells and there is plenty of thrust. I haven't done a current check yet but neither the 12A ESC or motor got even warm. Looking good so far!!
As you can see, the changes to the side profile are minimal/subtle, but the nose has had to be widened noticeably. I think it will still look like a Sigma in the air All the bits have been printed out & glued onto cardboard for templates. The structure will be 2mm foam for the fuse (with strategic reinforcement) & the tailplane, while fin will be 4mm foam.
I bench ran the motor with a Graupner CAM 9" x 4.5" on 2 cells and there is plenty of thrust. I haven't done a current check yet but neither the 12A ESC or motor got even warm. Looking good so far!!
Cheers,
Wayne
Once a Retrobate, always a Retrobate............
Wayne
Once a Retrobate, always a Retrobate............
- Wayne_H
- Posts: 812
- Joined: 17 Feb 2018, 05:26
- Location: Temora, NSW. Australia
- Contact:
Re: Sigma
Only limited progress to report:
1. Nose configuration & altered formers & fuselage drawing finalised
2. Templates made for all fuselage parts & tail surfaces
3. Sides & doublers cut out
4. Motor bench run with Graupner CAM 9" x 4.5" folding prop - 11 amps on a 2s pack. Should provide a 'brisk' climb
1. Nose configuration & altered formers & fuselage drawing finalised
2. Templates made for all fuselage parts & tail surfaces
3. Sides & doublers cut out
4. Motor bench run with Graupner CAM 9" x 4.5" folding prop - 11 amps on a 2s pack. Should provide a 'brisk' climb
Cheers,
Wayne
Once a Retrobate, always a Retrobate............
Wayne
Once a Retrobate, always a Retrobate............