RE: Venus II (Full Version)

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chuck993 -> RE: Venus II (10/12/2009 3:42 PM)

I might have to check out the spoilerons, the constant descent from downwind turning base to final and roll out works well also, you just need a little practice.



gaRCfield -> RE: Venus II (10/12/2009 4:26 PM)

+1 on the long landings.
YS 1.10/14x10 prop



Strat2003 -> RE: Venus II (10/12/2009 6:41 PM)

My landings got better as I approached the rear of the suggested balance range. I was running out of elevator with the cg forward and couldn't get the plane into a high-drag attitude.



bob27s -> RE: Venus II (10/14/2009 3:51 AM)


quote:

ORIGINAL: CustomPC

After over 6 months on the building board i have finally found the time to finish my Venus II and plan to maiden her tommorrow, weather permitting.

I was planning to use my Webra .91 but decided to go with the 1.20AX instead. I'm using a Turbo-Jett muffler which fits completely within the cowl. I used Dubro ball links on all control links and made my own pseudo carbon push rods by using some carbon tube over 4-40 threaded rod glued in with a small amount of gorilla glue. These are much stiffer than the metal rods and only add a few grams of weight.

Servos are Futaba 9255's on the Ailerons and Elevators, 9151 on the Rudder. Power is provided by a PowerBox DigiSwitch and Fromeco 2600mAh LiOn pack.

The dry weight is 3,900gm (8.59lb)

The balance came out almost perfect. I only needed 15gm (1/2oz) of lead weight near the tail wheel to get it on the reccomended CofG.

one thing that concerns me is that the landing gear has quite a bit of toe-out and i'm wondering if this will effect the taxiing at all?




Looks great !



anuthabubba -> RE: Venus II (10/14/2009 5:22 AM)

CustomPC,

Great looking plane! Toe out is desirable on taildraggers. That Turbo Jett fits in the cowl nicely. Have you tached the engine? Maybe a 16~8 would slow the plane some and should have good thrust for vertical and maybe some braking for down lines.

Terry in LP



CustomPC -> RE: Venus II (10/14/2009 5:44 AM)

I briefly tached the 15x10 at 9,100rpm. The tuning is quite broad with that muffler and I haven't really peaked it yet. I'm still leaving it rich for a few flights until break-in is complete.

I considered a 16x8 and have one on hand. I will try it next time out.

The engine needs to be mounted 4 degrees below horizontal which centres the muffler within the cowl. The muffler is on a slight angle to clear the engine mount beams.

The canister clears the cowl nicely but the exhaust flange needed a slight bit of filing away into a round profile so that it would not touch the cowl.

I had no problems taxiing the plane with the toe-out.



kochj -> RE: Venus II (10/24/2009 6:19 AM)

So how does this plane fly when flown precision aerobatics??
pull in uplines??
tuck in left knife edge flight?
Difficult to snap, or stall??



gaRCfield -> RE: Venus II (10/24/2009 6:38 AM)

Once the time is taken to trim the airplane, it flies very well. I have little to no pull in uplines. Very little KE coupling, though there is no real knife edge in the first two classes to speak of. My plane is (slower) rolling very nicely. Stalls are a slight mush forward. I have not tried to snap the airplane, again not in the schedule so mine's not setup to snap. My Yak has the prettiest snaps I've ever seen, by the way...[8D]

The plane flies Sportsman and Intermediate schedules very well. Sometimes I think I'd like a 'fancier' pattern plane, but the reality always sets in that this plane flies absolutely as good as or better than I need it to. It is always a pleasant treat to fly something else and come back to the Venus.

For the money it's hard to beat. It is not a $2000 airframe, however it will compete against one in the Intermediate class.

quote:

ORIGINAL: kochj

So how does this plane fly when flown precision aerobatics??
pull in uplines??
tuck in left knife edge flight?
Difficult to snap, or stall??




kochj -> RE: Venus II (10/24/2009 5:16 PM)

thanks..



rcpollo -> RE: Venus II (11/2/2009 1:28 AM)

With the YS did you use the stock engine mount that came with the kit? I'm putting in a YS 120 and was thinking I need to get an anti-vibration mount. But if the mount that came with the package will hold, I think I'll just make it easy and use that one. I'm not a power junkie, so what I lose to a little vibration won't upset me. Any thoughts?



gaRCfield -> RE: Venus II (11/2/2009 1:57 AM)

Use the stock mount. It's plenty strong and the plane is built like a tank. I used the stock mount with a YS 1.10 and it's totally fine. Vibe mounts will add more weight to an already heavy nose I think.



tande -> RE: Venus II (11/2/2009 2:01 AM)

I use these on EVERYTHING!...They are VERY popular in the pattern world....FWIW... http://www.centralhobbies.com/Engines/mounts/hydmnts.html



foxhills36 -> RE: Venus II (11/2/2009 11:06 PM)

started with the stock mount on a os .91, too much vibration, went to central hobbies mount, no problems, a little more nose heavy now.



rcpollo -> RE: Venus II (11/2/2009 11:17 PM)

Makes sense. How much weight did you have to add to the tail? I have the stab servos on the stab itself. This should counteract some extra nose weight.



gkpain -> RE: Venus II (11/4/2009 8:09 PM)

HI folks,

I have a Venus II new in the box, that I plan on giving my 13yr old son for Christmas. So he can start learning pattern flying.
I have not purchased the engine yet, and I'm alittle confused with yalls choice/size of engine.
Alot of you chose the YS 110, the O.S. 1.20 AX or 1.20 4-stroke. Mostly for the Vertical and upline.
What confuses me is, I also have a GP Little Toni with an O.S. 75AX, 14x6 prop, Slimline Q-series muffler and weighs in at 8.6lbs.
This airplane will climb out of sight, and it will pull vertical out of a hover, it has that much power.( hard to do)
The guys that put an 1.20AX in their Venus II all say they only go full throttle in the upline or vertical and it has more than enough power.
I quess what I'm trying to say is, is the 1.20 AX too much?
Would the new .95 AX be a smarter choice?
Has anybody tried the .75 AX? How does it perform in the V2?
I'm not opposed to putting the 1.20 AX in it, but if it would serve me better in a larger airframe and a smaller(lighter) engine would be enough for the V2.
why use the 1.20 AX if it doesn't need it? Why go with the heavier more costly engine.
I dont know much about pattern flying yet or the maneuvers, but i dont wanna underpower this airplane either.
Just something to think about guys, not trying to step on toes.

Thxs (GK) PAIN!



gaRCfield -> RE: Venus II (11/4/2009 9:21 PM)

The nice thing about extra power is it enables you to fly (or at least try to) fly a constant speed routine. With the 120AX you can fly around 1/2 throttle and advance for verticals, maintaining a constant speed.

I have the Venus 40 with a 55AX and I have to fly closer to 3/4 throttle, which means I have a lot less in reserve for verticals. It is nice to have 'extra' power, but I don't think the 120AX is 'over' powering the plane for an F3A pilot. More power is especially nice when flying in the wind, which we all have to do. It is nice to be able to maintain a good speed when flying directly into a 15-20 (or more) mph head wind.

The 95AX is actually more expensive than the 120AX by the way.

The 120AX and the YS 110 are awesome engines in the plane; I have flown it with both. I prefer 4 strokes, and might be inclined to try a 120 pumped 4 stroke, or even the new Thunder Tiger 130 four stroke. The YS is great but I spent too much time on maintenance and not enough time on flying, exactly what I was warned of by most other D1 pilots.

I saw the VII fly with an OS 120 four stroke and it seemed fine. I would not want ANY less power than that though.



codfish -> RE: Venus II (11/5/2009 1:50 PM)

quote:

ORIGINAL: gkpain

HI folks,

I have a Venus II new in the box, that I plan on giving my 13yr old son for Christmas. So he can start learning pattern flying.
I have not purchased the engine yet, and I'm alittle confused with yalls choice/size of engine.
Alot of you chose the YS 110, the O.S. 1.20 AX or 1.20 4-stroke. Mostly for the Vertical and upline.
What confuses me is, I also have a GP Little Toni with an O.S. 75AX, 14x6 prop, Slimline Q-series muffler and weighs in at 8.6lbs.
This airplane will climb out of sight, and it will pull vertical out of a hover, it has that much power.( hard to do)
The guys that put an 1.20AX in their Venus II all say they only go full throttle in the upline or vertical and it has more than enough power.
I quess what I'm trying to say is, is the 1.20 AX too much?
Would the new .95 AX be a smarter choice?
Has anybody tried the .75 AX? How does it perform in the V2?
I'm not opposed to putting the 1.20 AX in it, but if it would serve me better in a larger airframe and a smaller(lighter) engine would be enough for the V2.
why use the 1.20 AX if it doesn't need it? Why go with the heavier more costly engine.
I dont know much about pattern flying yet or the maneuvers, but i dont wanna underpower this airplane either.
Just something to think about guys, not trying to step on toes.

Thxs (GK) PAIN!


With the 120AX and the tank mounted over the CG and using a Bission pitts muffler (lighter than the stock muffler) the balance comes out perfect, no weight needed (servos mounted in the back). After thousands of flights with this combination I can say the 120AX is the *perfect* match for this plane. When you are hovering with the Venus I find I need to power of the 120AX to pull out. Less power and it wont be the same machine. A 75 would be way to small for this ship. It would fly, but won't do the kinds of things it is capable of. If i had to pick another engine for this plane i would try the new OS 95AX or the OS 91FX. One thing about the VenusII is that it is built way more rugged than many of the planes out there. I too have a little toni with an os 91 on it.



Strat2003 -> RE: Venus II (11/5/2009 6:10 PM)

I guess balance point is a personal thing, but I have 2 1/2 ounces of lead in the tail of my Venus II/120AX with the stock muffler. Tank mounted over the CG, servos in the rear, battery pack on a shelf at the back of the radio compartment. It still carries a little up trim for level flight but is pretty neutral in the downlines with 1 turn of droop in the ailerons. Someone suggested it needs a little incidence in the wing, so I may try that.
There's a surplus of power with the 120, so any weight you use to balance it is of little consequence.



codfish -> RE: Venus II (11/5/2009 6:27 PM)


quote:

ORIGINAL: Strat2003

I guess balance point is a personal thing, but I have 2 1/2 ounces of lead in the tail of my Venus II/120AX with the stock muffler. Tank mounted over the CG, servos in the rear, battery pack on a shelf at the back of the radio compartment. It still carries a little up trim for level flight but is pretty neutral in the downlines with 1 turn of droop in the ailerons. Someone suggested it needs a little incidence in the wing, so I may try that.
There's a surplus of power with the 120, so any weight you use to balance it is of little consequence.


Oh yes, I changed my post to mention that balancing with the 120AX was with a Bisson pitts muffler which is lighter than the stock muffler.

As far as the up trim in level flight vs downline, instead may i suggest trimming for level flight, then use a mix that puts in about 2-4% down elevator when the throttle is cut (for downlines). I have had to do this with all 4 of my Venus II's. Once this mix is set the model flies perfectly. Unless the factory made a mistake on your model, the Venus II's wing incidence is right where it should be, from the factory. It is set to +- zero. Don't change it!!



Strat2003 -> RE: Venus II (11/5/2009 7:58 PM)

Yes, a mix is worth a try.
I tend to try old-school fixes (from the pre-programable mix radio days) first. The old rule was, "Do something to the airplane to make you change the elevator trim in the direction you want it to go." I'm still carrying a tiny bit of up elevator for level flight and the elevator sensitivity is about what I like, hence the drooped ailerons (or increased incidence).



cmoulder -> RE: Venus II (11/5/2009 9:12 PM)


quote:

ORIGINAL: Strat2003

Yes, a mix is worth a try.
I tend to try old-school fixes (from the pre-programable mix radio days) first. The old rule was, ''Do something to the airplane to make you change the elevator trim in the direction you want it to go.'' I'm still carrying a tiny bit of up elevator for level flight and the elevator sensitivity is about what I like, hence the drooped ailerons (or increased incidence).


Where is the CG? How much push needed for inverted flight?

Sounds like it is still quite noseheavy, despite the weight you already added to the tail. I found 6-3/4" to be very good for CG.



gaRCfield -> RE: Venus II (11/5/2009 9:18 PM)

CG definitely seems to be a preference thing. However I went through most of the trim charts available online, and found I needed to adjust the thrust angle of the engine. This totally helped with inverted flight and with pulling out of dives. I had the CG pretty neutral, trimmed for level flight with a breathe of down elevator to hold level flight inverted. I didn't find a need to mix anything out other than 2% KE coupling.

For CG, I tried both the 120AX and the YS 110, and even moved them way back on the mount and modified the cowl to fit. EVERY combination required lead on the tail, minimum 1/2 oz and up to 2.5oz with the 120AX.



rcpollo -> RE: Venus II (11/26/2009 12:27 AM)

Would the stock fuel tank that came with the kit hold the pressure produced by a YS Engine? or do I need to get a Sullivan or other tank specifically made for YS engines?



tande -> RE: Venus II (11/26/2009 3:25 AM)


quote:

ORIGINAL: rcpollo

Would the stock fuel tank that came with the kit hold the pressure produced by a YS Engine? or do I need to get a Sullivan or other tank specifically made for YS engines?

FWIW I have "100's" of flights with a YS110 & the stock tank....so/far no problem....Not sure about the 110s (they develop higher tank pressure), I never could get my 110s to run to my satisfaction....



gaRCfield -> RE: Venus II (11/26/2009 8:14 AM)

Dave at YS parts and service actually advised me to use a Dubro tank. The pressure is like under 10psu, and those tanks (is Venus tank) is advertised to work with pressurized systems.



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