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Sockmonkey

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Apr 24, 2014
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Flint, Mi, USA
Its a pusher and 15 " of flow clearance from the fins, Not a problem, will use wide chord blades. And I do have a coanda/fan fin in the works (part notar ,part fenstron) or as translated-little window.
Like a sideways version of that little Hiller flying platform with the lifting duct?

Previous NOTAR designs always made me wonder if it would help to profile the tail boom like a fat airfoil to reduce the amount of force the tail rotor has to fight.
 

D Hillberg

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very low low low earth orbit
fat airfoil booms not needed flow fences or strakes will do the job- NOTAR has yaw instability and requires SAS and airfoil tails can't change for different torque events and add drag.

the coanda/fan fin uses an idea of a smaller fan/fin incorporated together without the draggy boom. It's a work in progress fan & duct done just need to run it... other stuff going now.
 

Sockmonkey

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Messages
1,916
Location
Flint, Mi, USA
fat airfoil booms not needed flow fences or strakes will do the job- NOTAR has yaw instability and requires SAS and airfoil tails can't change for different torque events and add drag.

the coanda/fan fin uses an idea of a smaller fan/fin incorporated together without the draggy boom. It's a work in progress fan & duct done just need to run it... other stuff going now.
That's why I suggested the airfoil tail as a supplement rather than the only means of counter-torque. Though I've seen some models fly with a movable rudder at the end of the boom to deflect the airstream.
 

D Hillberg

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very low low low earth orbit
airfoil tails don't adjust for torque in autorotation they still pull even in a reversed flow and the drag of the txsn + airfoil = you need more yaw control to straighten out the nose

you also have translating tendency to account for adding an airfoil tail just doesn't help.
 

TFF

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Apr 28, 2010
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Memphis, TN
It could be useful in some markets. No room for more than a bottle of aspirin, so not going to be trauma care, but for stable patients OK. Enstrom had to come up with a litter for the 480B. It slides and pivots part of the way out on the passenger side. Load the patient and slide them back in with feet in chin bubble. Although not meant for primary care many police departments have a requirement to be able to Evac patients with a department helicopter in disaster time. STC coming?
 

D Hillberg

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Nov 23, 2010
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very low low low earth orbit
1-Pilot/1-Doctor/1-Packaged patent or TC injury will hold o2, med kit, and monitor, not a CAMET style EMS but it's better than ground transport when time is the real factor.
STC will come later, will use 337 for the first batch. the kit installs in 5 minutes from normal seating to deck. :gig:Think going from deck to normal will have a small issue with gorp/cleaning...:lick:

Right now the kit is installed on a wrecked fuselage (that's how you get the nice back to front view over the rear seat)
 
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