HK Yak 55 EPP 1096mm - Page 15 - RC Groups
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Dec 31, 2011, 07:45 PM
Registered User

Second flight - sf prop and what is that smell?!

I went out today with the YAK with my buddies for 3 batteries of practice flight on low rates. Thanks again BigRoger for the setting advice. That was a huge help with desensitizing the control surfaces today!

New prop on 3530-11: GWS 10x4sf
This new prop that I picked up seems to add quite a bit more oomph for my motor. It puts out 245watts now at 22amps, so I'm a little hotter than before. The flight times showed that as well. I might try the 11x4sf prop soon to see if that works even better. Is the amp rating the only one I need to watch on my motor?

What's that smell?
Pardon my tangent here, but I finally pinpointed the nasty odor I've been smelling while working on this plane...and it IS the plane! Or at least the paint or foam. I don't know if any of you have noticed, but this thing smells like a public restroom up close...seriously. Not a real deal killer for me, but we have nicknamed my plane the YAKass for a reason :-) Sorry for the language. I find humor is just about anything.
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Dec 31, 2011, 08:08 PM
Just flitting about!!
bigroger's Avatar
the EPP planes generally have a bit of an 'ass' odour when new but it disappears after a while.

Still might be underpowered with your set up I think.
I get 370watt for 36 amps with apc11x4.7sf and Omega72g motor. Still not completely unlimited vertical but close.
This plane is a bit heavier than its Telink cousins of the same size due to the type of epp foam and that the fuse it molded as opposed to cut from flat epp sheet.

You should be able to push that prop size up to 11x4.7 for that motor but be sure to check the specs and try and run it close to the max spot amp rating of the motor spec from the supplier when you are at full throttle.

A 3D flyer should rarely be at full throttle for more than a few seconds at a time hence the reason why you can prop it up as much as possible to improve the airflow over the control surfaces when stalled as the only airflow at this time comes from the prop.
Jan 03, 2012, 12:55 AM
Registered User
Well, I tried the 11x4sf prop today and it just didn't do much more than gobble more amps, so I went back to the gws 1060 that they suggest over at HeadsUpRC. They do know their products! I couldn't agree more that my power setup won't do 3D well, if at all. I'm not able to launch out of anything close to hover with this setup. Oh well, I'm having a blast practicing knife edges and basic rudder controls! Cheers, Pedar
Jan 05, 2012, 12:36 AM
3drcparts's Avatar
Originally Posted by bigroger

I'm running mine now with the 3dhs Omega72g motor using apc 11x4.7sf prop and its simply amazing.

Good luck.
I sounds like you now like the Omega motor, before you said it felt strange?

Got my kit over the holidays and will follow your recommendations about motor mount and added bracing, looking forwards to this one
Jan 05, 2012, 04:54 AM
Just flitting about!!
bigroger's Avatar
My initial impression with the Omega was that it made the plane more nose heavy than the light 2216-1100kV motor I had and I didn't like the extra power it made.

I've since got used to the power and nose weight which helps the cg a lot more, I was originally heaps tail heavy but that made it easy to hover and harrier but had little power left for aerobatics. With the Omega, it eats more amps for sure but also packs a heap more punch.
Jan 06, 2012, 06:12 PM
3drcparts's Avatar
Originally Posted by songtoday
My Yak 55M EPP CF Version Thailand

Speed Jeti 40A
Servo Hitec 4xHS82MG
Propeller 11x4.7 sf
3s Li-Poly

Thank You (THAILAND)
what tail wheel bracket did you use
Jan 06, 2012, 06:16 PM
Just flitting about!!
bigroger's Avatar
Janole, just insert and glue a thick piece of large width zip tie into the skid to protect the foam. That's what most people do for this type of plane. Either that or a piece of carbon.
Jan 06, 2012, 06:19 PM
3drcparts's Avatar
that was my plan, I'll probably just hand launch this and harrier land anyways, but the wheel looks well done and knowing the source might come in handy in the future
Jan 06, 2012, 06:22 PM
3drcparts's Avatar
I have my servos installed and the elevator installed, any tips to attach the rudder and get it 100% square, is everybody using welders glue?
Jan 06, 2012, 06:28 PM
Registered User
Installing the rudder kinda freaked me out, Janole. I layered on some thick CA, sprayed the accelerator and stuck it on, eyeballing the alignment. Flys very straight!
Jan 06, 2012, 10:31 PM
Just flitting about!!
bigroger's Avatar
Janole, I used UHU Por (welders not available over here) and used the eyeball for straightness. Its as good as any I think and flys very true.

I did stick carbon in the rudder for stiffness also.
Jan 06, 2012, 10:40 PM
smoke is my wattmeter
Originally Posted by janole
I have my servos installed and the elevator installed, any tips to attach the rudder and get it 100% square, is everybody using welders glue?
I used a couple, few shortened toothpicks as dowels to keep it where I wanted it. I used Loctite Stick and Seal which I hear is similar to Welders. Great stuff.
Jan 06, 2012, 10:48 PM
3drcparts's Avatar
Thanks for the advise, I used the welders and it looks good and straight.

Did you add a carbon spar the length of the rudder? vertically?
Jan 07, 2012, 12:08 AM
Just flitting about!!
bigroger's Avatar
Not vertical but angled outwards from the root near the horn outwards to the top rearward tip of the rudder. Just to take some of the flex out.

You probably don't need it and in hind site might be better to have flex to save your rudder servo when doing tail touching.
Jan 08, 2012, 10:00 PM
Flippin Multirotors
Get Real's Avatar
Got a couple flights in with mine today. Was nice to fly something a little bigger than the 4-8oz foamies. Next time i make it out to an open flying area like today its coming with for sure to get more flights on it,its been sitting for a couple months now and ive been flying the small stuff mostly in the yard with the current weather out here. Ran the packs to lvc on both flights.. didnt want to stop flying it .

HobbyKing Yak 55 3D EPP (4 min 34 sec)

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