RCPowers Show full post »
e3_Scott
Hi Everyone -

This of course being my first full flight session with this plane, these are my first impressions, I don't like to jump to too many conclusions on the first go, but rather would have a couple more flight sessions under my belt before giving my solid overall impressions.  Either way, it is another winner from RC Powers in the V5 category, some tweaks that I might make for future flights, but here is my initial post flight report.🙂

CG - so my CG or balance point is about 1/2" ahead of the center of the solid black rectangle on the "CG spectrum" RC Powers puts on the V5 plans.  I suspect it might even be a bit further ahead than that, currently I am restricted because I can't get my weight any further back, my battery, ESC, receiver are about as far back as I can get them and it still flies nose heavy without considerable up trim (about 4 mm up deflection in the pitch currently).  This has been a trend with every V5 park jet I have built and flown, so doesn't come as a surprise to me.

Throws - I tend to fly with relatively low expo, 15% in the pitch and roll and 20% in the yaw and I tend to set my throws for more "scalish" flying, so your setup might be completely different depending on your preferences and flying style.

Pitch - 1/2" of travel in the elevons (one way);

Roll - 3/8" of travel (one way) in both the elevons and ailerons;

Yaw - 1 and 1/4" of travel (one way) in the under rudders.  I could probably use a bit more than that in all honesty, but then the rudder control surface might interfere with the control horns on my elevons.  Following are pictures showing where I held my ruler to make these measurements.
2019-06-07 11.01.51.jpg  2019-06-07 11.02.02.jpg  2019-06-07 11.02.18.jpg
Launch - I launched at about 50% throttle, the plane stayed quite stable and balanced as it flew away.  I did experiment with a little less and a little more throttle.  I don't think I would launch any lower than about 40% throttle as it just seemed a bit "mushy" for my liking.  Close to 60% throttle and I started to see significant torque roll (more on this later), so 50% seemed to work best for me with my power setup.

As mentioned in the video in the last post, it is very responsive and agile in the pitch and roll, I misspoke in the video, not quite as responsive in the yaw if you want to do aggressive rudder inputs.  With the bulk of the weight being crammed into such a small area of the plane, only 7" from the front of my battery to the prop nut on the motor has the motor, ESC, battery, Rx and aileron and elevon servos which account for well over half the weight of the plane.  Might be hard to see in this picture, but everything is as far back as I can get it.  I still need about 4 mm of up trim deflection on the elevons to keep the nose up.  Some of this may be cancelled out by the small metal washers you might be able to see on the motor mount area, but it was either that or the nose would "zoom" up with any sort of speed, so perhaps a compromise.  Having everything so tight to the CG makes for a very agile park jet.
2019-06-07 10.35.28.jpg
Torque roll - The motor on this park jet is quite far forward in relation to it's total length.  If the nose is 0 and the tail is 100, the motor is at about 56% which in my experience makes for a very balanced and agile park jet in the mid motor prop in slot configuration, but perhaps with where it is in relation to the leading edge of the wing, torque roll is a bit more noticeable.  Now it isn't crazy, most of the time when I hammered the throttle, it came on fairly gradually, but it was there unlike the T50 and F22 V5s which are a bit more "locked in" while accelerating and at full speed.  Of course I am using a fairly beefy 6" prop with 4.2 pitch, so I might consider "propping" or powering down somewhat.

Top speed - perhaps with the leading edge of my wing being a bit "dinged" up after my unsuccessful first maiden as it gets to top speed it occasionally "jukes and jives" a bit, or maybe I have something slightly misaligned, not sure.  I double checked that the trailing edges of my KF4 airfoils match top and bottom as sometimes that can cause issues as speed increases and they appear to be bang on, so I'll keep an eye on that in future sessions.

Slow speed - although not my normal way of flying, I did slow it down a couple times and it handled itself well down to about 35% throttle and I was able to do gentle turns with pitch and roll inputs and even slightly slower if I fed in a little rudder.  Down at about 30% throttle and it got a little bit unstable and unhappy and I started to see some wing rock.

Rudder effectiveness - I don't find the "under rudders" quite as effective on this plane as in the F-22 and T50, for aggressive rudder maneuvers like a stall turn, it managed to bring the nose around to the right without too much problem, but did not want to seem to go left.  I suspect that for slow flying, high alpha they will be quite effective which I have noticed on the F-22 and T50 in the past.  I certainly did use them when the wind came up a little bit to help keep the nose tracking straight and true during turns and I was glad to have them.

Wind stability -  I was actually pleasantly surprised how stable this plane is in the wind, later in the flight session, the wind came up to about 6-10 mph and this plane handled it very well.  As I mentioned in the video and through my build log, I dropped the battery to the bottom of the fuselage which makes my plane "bottom heavy" in that it wants to right itself naturally which in my experience makes for a more stable park jet, especially in the wind.  This plane thus far is better in the wind than the F-22 and T-50 V5s I built.

Glide/landing - This plane has a very efficient glide ratio, because mine is a bit "nose heavy", I do need to hold a bit more up elevator as it slows to land, but it seems to establish a very natural sink rate and touches down very softly.

So I think this might be a good candidate for a 5" 3 blade prop setup to help soften or even eliminate the torque roll I saw on launch and during aggressive acceleration, so I will think about trying that during the next or follow on flight sessions.

Overall, first impressions are that it is another winner for me from the RC Powers V5 lineup😎

#keepingRCPowersalive

Cheers,

Scott
Park Jet noise...the "other" sound of freedom😎
#ParkJetnoise #ParkJetpilot
Quote 2 0
e3_Scott
Hi Everyone -

Out getting some more stick time with my F-35 yesterday.

The setup in the video did seem to be a bit better than my initial setup, but I think what I was seeing as torque roll might actually be caused by something I either introduced in my build, during my crash or during my repairs.

As mentioned in the video, I am now running a 2306 2750 kv motor with a CCW Gemfan Hurricane 51499x3 prop which seems to have smoothed things out really well, so I will stick with that for awhile.  Not quite as fast, but the plane seems much smoother and predictable.

I also realized my mod cutting some of the side fuselage out to accommodate a 6" prop was a bit of a "fail".  As foam often does, it will still find a place to crack if the stress travels to the weakest point.  I'm not sure if these breaks occurred as a result of a hard landing or aggressive pitch maneuvers.  I did repair them at the field with epoxy and kept flying and they held for the rest of the flight session.  The red line in the picture below shows where the cracks occurred on both sides of the plane.
2019-06-09 10.28.56.jpg
Since the plane (and pilot) seem to be happier with the 5" three blade prop, I have already glued some foam pieces back in the gaps which I cut out.
2019-06-09 17.36.50.jpg
I am hoping that this will not only keep this area strong again, but perhaps also keep some cleaner airflow from the prop wash and the slip stream, more testing to come soon😎    

#keepingRCPowersalive

Cheers,

Scott
Park Jet noise...the "other" sound of freedom😎
#ParkJetnoise #ParkJetpilot
Quote 3 0
e3_Scott
Hi Everyone -

Another good flight session with my F-35 today, I think I am getting it dialed in just right now🙂  It has been a bit of a challenge, but I think what is most satisfying about the process is that I am over coming problems that I introduced...DOH!!!  Here is today's video with another power setup and some changes to the air frame that seem to make considerable difference to how the plane behaves and handles.  This is giving me the confidence to start pushing it and myself even harder as I fly it😎

So now that I have given up on the idea of running a 6" prop, adding the foam back into the sides of the fuselage as shown in the last post seems to have smoothed things out a lot.  Also the CCW prop also seems to have eliminated the plane's tendency to want to roll left which I now think was being caused by something being misaligned, not necessarily torque roll😳  I am hoping to see what it will do on 4S during the next flight session now that the plane is much more stable and predictable.

Another "bright" idea I had was to paint this plane with gloss acrylics, not sure why, just wanted to see how it looked.
20190610_140419.jpg
Doesn't really make the plane look a whole lot "shinier" than the normal flat acrylics I use, but what I did notice today was that when the sun angle was just right, the whole top of the plane became one color of "glare" so that I could not see the difference between the colors...OOOPS!  It is only an occasional "flash" when the sun angle and orientation of the plane is just right, but I think another lesson learned, back to flat acrylics for my park jets🙄

#keepingRCPowersalive

Cheers,

Scott
Park Jet noise...the "other" sound of freedom😎
#ParkJetnoise #ParkJetpilot
Quote 2 0
e3_Scott
Hi Everyone -

Managed to get out and have a little 4S fun with my RC Powers F-35 V5.  I knew going in it would not be the fastest plane in my hangar, but it moves along really well and after working through some "behavior" and flying issues that I more than likely induced through my build ideas, the crash or repairs after, I am extremely pleased with how solid and stable it is at speed now🙂


EDIT - If you want to have a real chuckle, watch this at double speed on You Tube, I sound like either I was breathing helium or I am part of Alvin and the Chipmunks😁, plus the plane goes super fast😉

#keepingRCPowersalive

Cheers,

Scott
Park Jet noise...the "other" sound of freedom😎
#ParkJetnoise #ParkJetpilot
Quote 2 0
e3_Scott
Hi Everyone -

A "table talk" video of my build, setup and journey thus far with my modified RC Powers F-35 V5, 4 good flight sessions complete, 50 flights now completed.🙂


#keepingRCPowersalive

Cheers,

Scott
Park Jet noise...the "other" sound of freedom😎
#ParkJetnoise #ParkJetpilot
Quote 2 0
e3_Scott
Hi Everyone -

Had my RC Powers F-35 V5 out for another spin, I changed the motor to a GepRC GR2306 2750 kv which is running faster and cooler than the RCINPOWER motor I had been using for the last couple flight sessions.🙂

After numerous changes in motor/prop combos and fixing some of the issues with the mod I made to try and swing a 6" prop, I feel like I and the plane are getting dialed in now so that I can start pushing it even harder as I build up more flights and experience with this very agile park jet😎

#keepingRCPowersalive

Cheers,

Scott
Park Jet noise...the "other" sound of freedom😎
#ParkJetnoise #ParkJetpilot
Quote 3 0
e3_Scott
Hi Everyone -

Lightin' it up with my RC Powers F-35 V5 Lightning II on 4S today😎


It has taken me awhile to fine tune this plane and my setup, however I am very pleased with it now, especially at speed on 4S.  The last flight session it would occasionally dip the nose a bit when I hammered the throttle on 4S, but whether I needed to balance it a bit better or a subtle change in trim, it now just stays straight and level like it was shot out of a gun🙂

#keepingRCPowersalive

Cheers,

Scott
Park Jet noise...the "other" sound of freedom😎
#ParkJetnoise #ParkJetpilot
Quote 3 0
e3_Scott
Hi Everyone -

Based on a comment left by one of my loyal You Tube followers on my last F-18 V3 video, I decided to do a head to head comparison of my modified F-18 V3 and F-35 V5.  I would have to say the F-18 V3 might be a little faster, 1 and 1/2" less wingspan does make a difference, but the F-35 V5 still acquitted itself very well, both with the same power setup and close to the same AUW😎

#keepingRCPowersalive

Cheers,

Scott
Park Jet noise...the "other" sound of freedom😎
#ParkJetnoise #ParkJetpilot
Quote 2 0
FoamRCPilot
New to RCPowers, how come these download/purchase links don't work?
Quote 1 0
solentlife
I note the huge slot you have for the prop ..... I try to minimise mine and in my mind that helps to flow straighten the prop wash before it gets back to elevons etc. I accept that I probably add a few dB to the sound level ... but slot jobs are bl***y noisy anyway ! I also do not use flexi props so have no fear of prop strikes.
I'll fly anything if I can launch it ! Youtube : solentlifeuk
Quote 1 0
FeWOlf
Out of the builds I done v1,2,3,4 and most v5 series, this one has given me the most trouble with building, the fuselage is been my bane, I set it down and went on to another build.
Fly Like Hell, and you will get there!
Quote 2 0
KAONA
I've bought all the v5 plans.

What is the wing area on the F35 and F18 v5?
Quote 3 0
bernicotin
Hello everyone. I introduce myself, I am Belgian and my name is Bernard. I am an apprentice pilot and I just bought the plans for the f-35 v3. Did I make a mistake and should I have taken the F-35 v5 version? Greetings.
Quote 1 0
Sidewayskiwi
bernicotin wrote:
Hello everyone. I introduce myself, I am Belgian and my name is Bernard. I am an apprentice pilot and I just bought the plans for the f-35 v3. Did I make a mistake and should I have taken the F-35 v5 version? Greetings.

Aboslutely not most started on the F35V3 or F18V3 
The F35V3 is very stable and more of a trainer than the F18 or similar and later F35 versions its big and floaty 
Fit the KF2 airfoil 
look up RCPOWERS on you tube and find the vid with Dave and the F35V3 its really informative
ive built 2 so far last one has lasted 2 years and is built out of Adams Readiboard (or dollar tree foam the paper backed foam board )
Quote 2 0
JTiger
bernicotin wrote:
Hello everyone. I introduce myself, I am Belgian and my name is Bernard. I am an apprentice pilot and I just bought the plans for the f-35 v3. Did I make a mistake and should I have taken the F-35 v5 version? Greetings.


Welcome! I don't think you can really go wrong with RCPowers planes. I started on the F-22 v1, moved onto the F-18 v3, and since then have built several others including the MiG-29 v1 and T-50 v1. All great planes, all a little different. Would I start with the F-22 again? Maybe not, but it really wasn't too bad. By all accounts the F-35 v3 is a great trainer; I'm sure it will serve you well.
Quote 0 0