Hokusei Ultima: A bigger, stronger, and better EPPP? - RC Groups
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Feb 24, 2008, 10:31 PM
EP 3D Flyer
feda's Avatar
Discussion

Hokusei Ultima: A bigger, stronger, and better EPPP?


It is apparently much bigger, seemingly stronger; but is it better?

Specs:
- Wing Span 1100 mm (43.3 inch)
- Length 1065 mm (41.9 inch)
- Wing Area 27.3 d㎡ (423.2 sqin)
- Flying Weight 475~485 g (16.8~17.1 oz) with no battery
- Propeller APC SF 11x4.7, GWS SF 1147, GWS SF 1047
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Feb 25, 2008, 09:38 AM
Registered User
Do you have any video?
Steve
Feb 25, 2008, 01:33 PM
Flippin Multirotors
Get Real's Avatar
Quote:
Originally Posted by stevelmaa
Do you have any video?
Steve
Theres two videos Here at the hokusei japan site. I really like these designs and wish they were distributed by some US distributors,this is a really good size for park flying.. bigger but still very controllable in tight surroundings . Currently theres 3 planes in the ''SOV'' size.. the primus sov is cool to ''SOV''(super outdoor version).. these would probally be good indoors in larger indoor areas to .
Feb 25, 2008, 05:22 PM
Registered User
Thanks Real.
Feb 26, 2008, 03:54 AM
EP 3D Flyer
feda's Avatar
Continue to build ... ...

Glue the wing and the stablizer tentatively in case that they need to be adjusted later.

Install hinges for control surfaces.
Last edited by feda; Feb 26, 2008 at 06:54 AM.
Feb 28, 2008, 04:41 AM
EP 3D Flyer
feda's Avatar
Install the main landing gear so that my Ultima can stand up. The horizontal carbon rod and the lengthwise carbon rod seem to be an afterthought design.
Mar 07, 2008, 01:04 AM
EP 3D Flyer
feda's Avatar
Now, install the tail skid. Notice that I didn't follow the manual but wrapped the reinforcement paper around the small piece of plywood, onto which the metal skid is attached. I think the tail skid ended up stronger my way.
Last edited by feda; Mar 07, 2008 at 01:32 AM.
Mar 07, 2008, 03:41 AM
Registered User
Threshold's Avatar
Don't see how you can get the CG right with such a short nose, massive motor and battery the only way, then its too heavy
Mar 07, 2008, 03:46 AM
EP 3D Flyer
feda's Avatar
Quote:
Originally Posted by Threshold
Don't see how you can get the CG right with such a short nose, massive motor and battery the only way, then its too heavy
We will see. Hokusei's design hasn't failed me so far. Thanks for your concern.
Mar 09, 2008, 08:23 AM
EP 3D Flyer
feda's Avatar
The manual suggests to cut the root of the horn for the elevator. I am not quite comfortable with this. Therefore, I have driven 2 holes into the carbon fiber strips on the surface of the elevator and let the horn stick into it.
Mar 09, 2008, 12:49 PM
slow but inefficient
Ron Williams's Avatar
Has anyone in the US acquired one of these? It looks like it goes for about $155 in Japan without shipping. Are they being sold here?
Mar 09, 2008, 01:05 PM
Registered User
Threshold's Avatar
Quote:
Originally Posted by feda
We will see. Hokusei's design hasn't failed me so far. Thanks for your concern.
Apart from that it looks really good, am looking forward to your report.
Mar 09, 2008, 01:24 PM
Scott Stoops
sukhoi26mx's Avatar
That landing gear design looks kind of sketchy. So it's not removable? There are so many good ways to make bent wire landing gear removable (vertical blade assembly works best) that its a shame to have it glued in. Many flying sites are better served with the landing gear removed.

Also, and carbon built in to stiffen the stabs and rudder? Can't tell from the photos.

Scott
Mar 09, 2008, 01:36 PM
Registered User
Mike Smart's Avatar
Anyone noticed that the construction of this is very similar to the CST Katana, even down to the wide carbon elevator joiner and cutting off the pins of the elevator horn? Are we talking same factory or desgner?

Mike


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