Good to see the first Chipmunk in the background. Following your lead, I did the same electric conversation to 6S and has always been a real favourite.
Hello Danny, with three scales you can find more precisely the CG point with some simple math (moment calculations) without any rigging and suspension on the ceiling, like the big brothers do. 😊
Hello Danny, I built up a Venessa Balancer similar to yours to use on my Phoenix Model .55 Size Corsair. It has a 58.5 Inch Wingspan and weighs about 7 pounds. The instructions that came with the Corsair say to balance it up-side-down and establish a CG at 85mm behind the Leading Edge, so I did that. What confuses me a little is why the model when balanced right-side-up, using the same set-up winds up with a different amount of nose weight than when balanced up-side-down. I have a thread on RC Groups where I documented the Venessa Balancer Set-up. I was wondering if you can have a look at it and let me know if I'm using it correctly. I decided to use a Laser Level that projected a Red marker down the side of the Corsair's Fuselage and lined it up with a Horizontal seam between the Hatch and the mating portion of the Fuselage. I thought that would be a good way to determine when the model could be considered "level". I adjusted the weight so that the Red Laser Light ran right down the seam. Some people are balancing their Corsairs right-side-up in the Venessa Balancer and they lay a bubble level on the flat surface below the Rudder to know when the airplane is level, however, again, I question why my test results were different when I flipped the airplane over and tried to balance it right-side-up. Here below is a link to the post I made on the RC Groups Website. Scroll down to Report Number 474 to see my post about Balancing the airplane. www.rcgroups.com/forums/showthread.php?2438030-Phoenix-Models-F4U-Corsair-%28PH011%29/page32#post52227853
That's very interesting, my initial thoughts are that the aircraft should not be level but slightly nose down when the right way up, to bring the wing section level. (Usually the wing is plus a few degrees on the thrust line) with model upside down the nose will need to be slightly up. If you have used the same reference for both then I don't understand.
Hi, I like your vid, but I'm still trying to understand this contraption. When the model is sitting within the rope swing, doesn't the rope stop the model from tipping forward or backward? Or does adding weight to the front or back, cause the model to tip forward or backward, moving the CG point?
you rotate the dowel at the top to keep the model level. It is important that it is level. The dowel is a snug/friction fit so wont spin of its own accord, you must turn it. As you add weight to the nose it pitches forward. you rotate the rod to make the model level again. This moves the vertical plumb forwards on the model, ie c of g further forwards.
Thanks for that clarification. I guess using Vanessa for a large biplane would be the same process? i.e. If the CG shows on the plans as being a point on the top wing, string up Vanessa through the top wing only and keep the model level through the marked thrust line on the plans?
Leave it with me, i did do another video showing the lifting and raising as I have a pulley and a cleat in the garage roof. I am away all week so it will have to be at the weekend
I'll have to test this, but do you think that the weight of the rubber tubing on the loops could alter the measurement? I don't normally weigh my models as you did, but I can see the benefit of it by adding a touch of weight to even it up. Nice video, thanks!
@@cammnut Testing in my rig showed that weight on the line will affect the balance, but it is so small as to not really matter. It was an interesting thought experiment though! Thanks again! I hope you found a good camera person to cover the maiden!
What chipmunk is that? Funny I’m sure i understand this. If you adjust the airplane level and it is fixed as the dowels do not freely move, won’t the Bob always point to same spot? Thx!
This Chipmunk is a Seagull 81" version that I gave a make-over. All detailed in this set of videos czcams.com/play/PLnUT7Oo46w0fA_j3AJx4ImqY8ok8FkGCJ.html
level is through your datum. Most models fly straight and level with a little positive incidence on the wing. but that depends on the wing section. so not a straightforward answer for all types. On the Chipmunk for example, the datum is parallel to the canopy rails.
Good to see the first Chipmunk in the background. Following your lead, I did the same electric conversation to 6S and has always been a real favourite.
Yes mine is 11 years old and flies in "flying only" scale comps still. Mine is on 5S
Hello Danny, with three scales you can find more precisely the CG point with some simple math (moment calculations) without any rigging and suspension on the ceiling, like the big brothers do. 😊
You can indeed, though I wouldnt trust my maths!
Thanks for the push to make the video, good fun :)
? Do tell.
Excellent Danny - two neat solutions!
Hello Danny, I built up a Venessa Balancer similar to yours to use on my Phoenix Model .55 Size Corsair. It has a 58.5 Inch Wingspan and weighs about 7 pounds. The instructions that came with the Corsair say to balance it up-side-down and establish a CG at 85mm behind the Leading Edge, so I did that. What confuses me a little is why the model when balanced right-side-up, using the same set-up winds up with a different amount of nose weight than when balanced up-side-down. I have a thread on RC Groups where I documented the Venessa Balancer Set-up. I was wondering if you can have a look at it and let me know if I'm using it correctly. I decided to use a Laser Level that projected a Red marker down the side of the Corsair's Fuselage and lined it up with a Horizontal seam between the Hatch and the mating portion of the Fuselage. I thought that would be a good way to determine when the model could be considered "level". I adjusted the weight so that the Red Laser Light ran right down the seam. Some people are balancing their Corsairs right-side-up in the Venessa Balancer and they lay a bubble level on the flat surface below the Rudder to know when the airplane is level, however, again, I question why my test results were different when I flipped the airplane over and tried to balance it right-side-up. Here below is a link to the post I made on the RC Groups Website. Scroll down to Report Number 474 to see my post about Balancing the airplane. www.rcgroups.com/forums/showthread.php?2438030-Phoenix-Models-F4U-Corsair-%28PH011%29/page32#post52227853
That's very interesting, my initial thoughts are that the aircraft should not be level but slightly nose down when the right way up, to bring the wing section level. (Usually the wing is plus a few degrees on the thrust line) with model upside down the nose will need to be slightly up. If you have used the same reference for both then I don't understand.
Excellent!!!
Thankyou
Hi, I like your vid, but I'm still trying to understand this contraption. When the model is sitting within the rope swing, doesn't the rope stop the model from tipping forward or backward? Or does adding weight to the front or back, cause the model to tip forward or backward, moving the CG point?
you rotate the dowel at the top to keep the model level. It is important that it is level. The dowel is a snug/friction fit so wont spin of its own accord, you must turn it. As you add weight to the nose it pitches forward. you rotate the rod to make the model level again. This moves the vertical plumb forwards on the model, ie c of g further forwards.
Thanks for that clarification. I guess using Vanessa for a large biplane would be the same process? i.e. If the CG shows on the plans as being a point on the top wing, string up Vanessa through the top wing only and keep the model level through the marked thrust line on the plans?
@@chrismcg7856 hi Chris you can sling it from the front and rear of the fus, doesnt have to be the wings.
I would like to see the working part of the jig if possible please Danny and how the cord is wound around the dowel thank you
Leave it with me, i did do another video showing the lifting and raising as I have a pulley and a cleat in the garage roof. I am away all week so it will have to be at the weekend
Thank you Danny, from what I understand the cord has to be equal but nor sure in which way? All the best
I have never worried about the chord lengths, not sure if you are over thinking this....
@@cammnut most likely mate!! 🤣🤣🤣
😀
I'll have to test this, but do you think that the weight of the rubber tubing on the loops could alter the measurement? I don't normally weigh my models as you did, but I can see the benefit of it by adding a touch of weight to even it up. Nice video, thanks!
No i dont think the foam has any bearing on the system
@@cammnut Testing in my rig showed that weight on the line will affect the balance, but it is so small as to not really matter. It was an interesting thought experiment though! Thanks again! I hope you found a good camera person to cover the maiden!
The rig is not really suited to smaller models, perhaps then the chord may have more bearing. The short pieces of neoprene are very light
What chipmunk is that?
Funny I’m sure i understand this. If you adjust the airplane level and it is fixed as the dowels do not freely move, won’t the Bob always point to same spot? Thx!
You rotate the dowels to get the model level, as you do the model moves under the plumb-bob
This Chipmunk is a Seagull 81" version that I gave a make-over. All detailed in this set of videos czcams.com/play/PLnUT7Oo46w0fA_j3AJx4ImqY8ok8FkGCJ.html
Everyone talks about level. What is Level? The Prop, the canopy the Tail Stab.??
level is through your datum. Most models fly straight and level with a little positive incidence on the wing. but that depends on the wing section. so not a straightforward answer for all types. On the Chipmunk for example, the datum is parallel to the canopy rails.