Origin for helicopter modelling

larrylynx · February 5, 2019 at 11:17 AM

I know that the origin when modelling an aircraft is the c of g (approx 25% of the root chord) but where does FS2 place the origin for helicopters.

Centre of the blade plane or rotor hub..or

Centre of the mast but on the ground ..or

Somewhere in between

Steve

Jet-Pack (IPACS) · February 5, 2019 at 11:46 AM Official Post

Hi Steve,

the center of your model does not affect the center of mass of the physics. It only affects where you look at with the camera. We usually try to get the center of the model close to the CG, that means in the rotormast at the estimated z-height above ground where the CG would be. Some CGs are slightly aft for the real helicopters but it is easy to imagine measuring x in terms of fwd of mast, y left of mast and z, well above or below CG.

If you can't decide you could always pick the design eye position z-value or the cabin floor or something like that.

Bellah1w · February 7, 2019 at 9:23 AM

Please tell me you are working on a Lynx ..LarryLynx...

larrylynx · February 7, 2019 at 9:54 PM

As of this moment in time, errrrrr no. I am off to measure one on monday and once the F104 is completed as much as I can, well I ................. ok I will and it will be a MK7, not one of those Mk9 wheelie bins.. Quite how far I will get is unknown.

Steve

Donny · February 8, 2019 at 10:40 AM

Steve you absolute machine. ^{the hype is real}

Bellah1w · February 13, 2019 at 4:15 AM

I'll take a Lynx anyway you dish it up brother.

It's never had great attention in the other sims so it would be nice to see one here!

f104 looks finished to me

PS real helicopters don't have wheels so I agree.

larrylynx · February 13, 2019 at 12:34 PM

Wheels do make em easier to move on the ground, it was a right pain with the Lynx but I agree, wheelie bins are not for me either

Managed to see 5 sad old girls but got my measurements, shame I can't get some accurate 3 view drawings

HiFlyer · February 13, 2019 at 4:13 PM

[Blocked Image: https://imageshack.com/a/img921/6022/1NSeiG.gif]

https://3dwarehouse.sketchup.com/model/102e6751…t-Westland-Lynx

larrylynx · February 13, 2019 at 5:32 PM

Hi Hiflyer

Thanks for the 3 view, its a navy version but looks better than the ones I have.

Steve

TomB · February 13, 2019 at 6:18 PM

https://www.the-blueprints.com/blueprints/helicopters/westland

larrylynx · February 13, 2019 at 7:45 PM

Hi Thomas

Forgot I had an account there, managed to find one that looked fairly accurate, most were wrong. I know that when they draw the cabin door square things are not good. Also the lynx roof line kicks up slightly above the forward doors and 99% of drawing has this flat.

Steve

nemo_uk · February 14, 2019 at 12:18 AM

Hi Steve,

A pretty good Lynx blueprint ...

http://www.airwar.ru/other/draw/lynx.html

I used it to make this 3D model a while back ...

http://www.tonyelms.com/wp2/?projects=westland-lynx

Mk7 is definitely the nicest looking.

regards,

Tony

larrylynx · February 14, 2019 at 12:36 AM

Very Nice model Tony, we need people like you to expand the fleet, how good are your TMD skills. Polygon limit is somewhat higher in FS2, my starfighter was nearly 300,000

An early Mk7 is pretty much a Mk1 with the opposite rotating tail rotor (much needed) , later 7"s had berp blades etc

Steve