Hi all,
How and what do you use to check C of G on large scale models?
Thanks,
Phill
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C of G measuring
- RobbieB
- Posts: 547
- Joined: 07 Mar 2015, 22:22
- Location: North West
Re: C of G measuring
A simple balance Phil with a graduated scale which indicates the position of the CG behind the leading edge. Very sensitive and more than accurate enough.
Doesn't take long to put together and you only have to make it once.
There is a 'hanging from the ceiling harness and plumb line' method but I found that a bit of a faff.
Doesn't take long to put together and you only have to make it once.
There is a 'hanging from the ceiling harness and plumb line' method but I found that a bit of a faff.
- Max Wright
- Posts: 198
- Joined: 10 Mar 2020, 19:57
- Location: Clayton Bay South Australia
Re: C of G measuring
[There is a 'hanging from the ceiling harness and plumb line' method but I found that a bit of a faff.
[/quote]
It's called a Vanessa rig, Robbie. It's good for heavy warbirds et. al.
[/quote]
It's called a Vanessa rig, Robbie. It's good for heavy warbirds et. al.
Max
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- Posts: 329
- Joined: 18 Aug 2015, 20:38
- Location: South Cambs
Re: C of G measuring
Thanks chaps,
I will have a go at making both, although the engineer in me wants to have a go at making something using load cells like this http://mahmoudi-modellsport.eu/glidercg-15kg
Phill
I will have a go at making both, although the engineer in me wants to have a go at making something using load cells like this http://mahmoudi-modellsport.eu/glidercg-15kg
Phill
- terry white
- Posts: 508
- Joined: 18 Mar 2015, 21:08
- Location: wareham,dorset.england
Re: C of G measuring
Phill, spend your time and money on the model and build the one shown by Robbie. Most of us have one and it does us proud.
- Peter Balcombe
- Posts: 1399
- Joined: 18 Mar 2015, 10:13
- Location: Clevedon, North Somerset, U.K.
Re: C of G measuring
Phil,
T9HobbySport do the 4Kg & 8Kg Max. units for approx. £103 each.
I built a similar function load cell type unit a few years ago & use it for smaller models.
My main concern with the electronic units is that all of the model weight is taken on 2 relatively small pads under each wing - the pads need to be small to measure loads at defined distances from a reference point for the overall CoG calc.
Robbie’s unit looks simple to make & easy to use - just doesn’t measure AUW at the same time.
Peter.
T9HobbySport do the 4Kg & 8Kg Max. units for approx. £103 each.
I built a similar function load cell type unit a few years ago & use it for smaller models.
My main concern with the electronic units is that all of the model weight is taken on 2 relatively small pads under each wing - the pads need to be small to measure loads at defined distances from a reference point for the overall CoG calc.
Robbie’s unit looks simple to make & easy to use - just doesn’t measure AUW at the same time.
Peter.
- RobbieB
- Posts: 547
- Joined: 07 Mar 2015, 22:22
- Location: North West
Re: C of G measuring
Yep, saw one on here (Brian's I think) and just built it - so easy and cheap, less than a tenner plus some scrap if I recall.terry white wrote: ↑03 Sep 2020, 11:06 Phill, spend your time and money on the model and build the one shown by Robbie. Most of us have one and it does us proud.
- Noël Rumers
- Posts: 220
- Joined: 20 Mar 2015, 10:29
- Location: Hoboken Antwerp
Re: C of G measuring
Hi Phill,
I did see this one with a rather big plane on...
I build it and works fine.
Noël
I did see this one with a rather big plane on...
I build it and works fine.
Noël
Re: C of G measuring
MPX balancing rig - about £20 when I bought mine decades ago and it will handle up to 16kg because I did my Let Ash 26 on it for the maiden.
About £40 now, or pence if you copy Robbie's in scrap wood.
John M
About £40 now, or pence if you copy Robbie's in scrap wood.
John M