Ft viggen group build!
- Thread starter The Hangar
- Start date
BATTLEAXE
Legendary member
Looks like its doin 90mph standing still bro
Matagami Designs
Master member
Got my new 4s battery today. Before I even get it out of the box I'm thinking oh wait my charger only does 2s and 3s. Looks like the viggen shopping list is getting longer. 😫
Aww, shoot! I really need to upgrade to 4s power, so thankfully my charger can go up to 6s.
Ain’t she a beauty? I got it all glued up and all she needs is servos and some wiring. I am super stoked to fly it! I think I’ll maiden it as soon as I can since the weather looks good for the next few days before it starts raining, so after the maiden, I’ll paint it. I’m a little worried cause I have a very slight thrust angle in the motor going the “wrong” way and also with the kfm wing creating more lift in the back causing it to pitch down. You can see the slight thrust angle in the last pic. @Hai-Lee what are your thoughts? Should I run a standard prop and reverse the motor so the torque will be opposite the thrust angle? And the kfm wing - should I be worried about that? Thanks!
It’s decent. 1500 3s all the way in the nose balances pretty good, and with the servos in front of the cg, it should give me a little wiggle room.
Hai-Lee
Old and Bold RC PILOT
Firstly the KFM wing will add a little lift but also a little weight so it will stall at just a tad faster speed than standard.
As for the thrust angle why don't you add some packing/spacers under the right side mounting screws to straighten it out. It would be simpler than trying to fly with side thrust from the motor.
Make sure that you have plenty of elevon throw and plenty of expo and it should all go well. Just beware of the spinning prop when you attempt the launch. Also launch with a slight nose up attitude and launch the bird slightly upwards as well as the elevon controls wash off lift to raise the nose and if there is insufficient height at launch you WILL slap the tail onto the ground.
have fun!
Yup - will do the soldering tomorrow or when I get a chance.
Oh - great idea. Will do. And I’ll pass this on to my launching buddy! Thanks again for your help!
Hai-Lee
Old and Bold RC PILOT
Just one tip for after you get it flying. You will find that the pitch control is a little subdued or slow whereas the roll is ridiculously fast. You can alter the control balance by adjusting the mix rations if you radio has the ability. I start with 40% aileron and 60% elevator in the mix. it makes fast turns a little more controllable!
Have fun!
Ok, thanks. I think that my dx6e can do that.
L Edge
Master member
One other thing that you should do before the test flight is "Are your ailerons and elevator angles the same when they are fully deflected?"
Reasons: In many cases, the cheaper servos spline locations are never the same. Yeah, you can use sub trim to even the centers out, yet when you deflect say the elevator, in many cases, you will find that the angles are different. Result, adds direction to the other axis.
The roll rate on this puppy is real fast being a delta. When launching any type of plane , try not to exceed 20 degrees because it will cost you especially if it is windy. Have a good one.
Thanks for the tips. Once I get my servos in I'll try this. I've been using the Miuezi servos for a while, and have them on my bravo and ft-22 and they seem to be pretty good.
Matthew Sanders
Elite member
Wait, what charger do you have? Mine only goes up to 4s
I have the venom pro duo. Worth every penny - I love mine and have been using it for several years now. I got mine for my rc trucks, and then when I started getting into airplanes, everything transferred.
https://www.venompower.com/venom-pr...ipo-lihv-nimh-rc-battery-balance-charger-0685
Matthew Sanders
Elite member
Nice, my 4s compatible charger was only 34 bucks on the FT store, 10 more dollars then the 2-3s charger on the store! Ill agree, looks like it's worth it!
Nice! $35 bucks is great, and no need to spend more than you need. I,ve only charged 2s and 3s batteries on it so far, but I really want to get into 4s. The features I have used so far to make it worth it for me is that I've charging lipo, nimh, and li-ion batteries for my planes, trucks, and boat. And since both sides are completely separate, I can charge completely different battery types or sizes at a time.
Matthew Sanders
Elite member
So does mine, at least with the different types. I only can charge one at a time, though. Sweet, I may put a 4s in my Viggen but a 2200 3s should work with my power system
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