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HelicopterOff Topics Planes and Jets › The official plank thread.
01-16-2011 02:53 AM  7 years agoPost 1641
Spitfire1

rrElite Veteran

Perth Australia

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I use a balanceing machine with stops that go on the front of the wing, it has an adjustable measureing ruler.

When I just used my fingers on the bottom of the wing with the plane upright it seemed OK, but when I used the measuring device with the plane upside down it is just a whisker nose heavy.

Honestly Im starting to think useing the balancer is no easier than just useing my fingers, I think its a bit more accurate though because you can get the measurement precise as a post to useing clumsy fat fingers with the prop in your face, you can put it on the balancer and use you free hands to rock it one way or the other to see which way it tends to lean.

I am just going on the CG that is written in the manual, there is no range given, theres some formula they use 27% of MAC I think.

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01-16-2011 03:32 AM  7 years agoPost 1642
koppter

rrApprentice

Virginia

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27% is pretty conservative, but in the end all it is is a point that some one thought worked for the airplane. obviously, there's a reason that the mfrs start with a conservative CG, but you shouldn't obssess about hitting that point. most modern aerobatic airplanes are stable within a range of 25% to 33%. there are plenty of sites that will give you the math to calculate CG on a given wing. airplanes that are biased nose heavy have certain characteristics, as do tail heav(ier)airplanes. below is a trim chart that you might find useful.

http://www.nsrca.org/trima.htm

have fun

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01-16-2011 03:40 AM  7 years agoPost 1643
tryan02

rrProfessor

Canton, Missouri

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the best way Ive seen to balance is some string and a pulley from the garage rafters hook to the nose cone and tip of the tail this way the whole plane gets balanced. some planes measure wingtip others measure against the fuse. But almot all of the aerobatic planes are just behind the wing chord.

Oh and lastly a check to tell if your CG is dead on trim it out till you can take your hands off the remote and the plane flys straight. Then flip it over inverted and it should do the same.

No Really I am the club President!!!

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01-16-2011 04:08 AM  7 years agoPost 1644
Spitfire1

rrElite Veteran

Perth Australia

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That trim chart should come in handy.

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01-16-2011 06:30 AM  7 years agoPost 1645
Spitfire1

rrElite Veteran

Perth Australia

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I found this that gives some reasons for not launching edf`s at full throttle, 52 seconds into the vid he gives his reasoning and sounds to be as I suspected, I would resist the urge to launch at full throttle unless you suspect the power is marginal, as is often the case with larger 70mm and 90mm jets.

Watch at YouTube

How not to.

Watch at YouTube

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01-16-2011 08:32 AM  7 years agoPost 1646
fla heli boy

rrKey Veteran

cape coral, florida

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guaranteed.....that guy got picked last for EVERYTHING in gym class.

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01-16-2011 08:47 AM  7 years agoPost 1647
Dood

rrProfessor

Wescanson

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Hand launching... I cut the crap out of my hand trying to launch my Stryker last month. It hurt a lot. And thats all I have to say about that.

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01-16-2011 08:58 AM  7 years agoPost 1648
fla heli boy

rrKey Veteran

cape coral, florida

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but that's a pusher, so you've got an excuse, he doesn't......

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01-16-2011 11:32 AM  7 years agoPost 1649
MPA

rrElite Veteran

Australia

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Whats all the running along and tossing it like a 5yo.

I just hold my plank up above my head standing still, hit the throttle and let go and away it goes.
No need to run and no need to chuck it either.

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01-16-2011 05:20 PM  7 years agoPost 1650
tryan02

rrProfessor

Canton, Missouri

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Whats all the running along and tossing it like a 5yo.

I just hold my plank up above my head standing still, hit the throttle and let go and away it goes.
No need to run and no need to chuck it either.
Agreed! You CAN NOT! run fast enough and launch a plane to do any good. But hey thats the info from RCPOWERS.

I have never owned my own edf so I am ignorant on the subject. I thought maybe these jets are difficult to launch more so than prop planes? At least thats all the horror stories you hear. But you dont know if its the product or the inexperience of the user.

I have thrown a couple of the bigger jets that were for guys and they had no problem with my launch. So I guess I know what I am doing I just didnt realize I did. Mainly because of all the hype of how hard it is to hand launch.

I have launched indoor foamies parkzone T-28, Corsair, Stryker, new wildcat, Couple home made jobs and a Eflite F-16 and a GWS F-18. But only the T-28 and indoor foamies for myself. And always launched them at full throttle. My way overpowered T-28 I could launch vertical.

No Really I am the club President!!!

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01-17-2011 12:23 AM  7 years agoPost 1651
Spitfire1

rrElite Veteran

Perth Australia

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I would suggest not to listen to what people say in web forums and dont listen to Rcpowers either, I wish I had not listened and just tried to launch at full throttle.

I tried to lauch on about 1/2 throttle and the plane instantly flipped over and nosed into the ground.

The plane was all but destroyed but with some electric tape and nothing to loose now I tossed it up a second time at about 3/4 throttle, the plane flipped over immediately but this time instead of aborting I pushed up elevater and tried to flip out.

The first few seconds the jet just did wild 3d manouvers in front of me at one point was in a tail down hover, but by nothing short of a miracle I managed to get it flying, all I can say is until I used full throttle I had absolutely no controll at all, the first time I felt any control was when I realised the plane was hovering nose up, I gave it full power and the plane quikly pulled out of the hover and flew normaly.

I flew a few circuits but was not able to get used to the jet fast enough and nosed in at full power from a turn, Im sure with a few more turns I would have got used to it, the jet is fixable with epoxy but the fan is destroyed, not sure if its worth fixing because I cant see how it will be possible to launch this thing, if I fix it I will try full throttle.

I dont think I will ever buy another handlaunch jet again.

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01-17-2011 12:31 AM  7 years agoPost 1652
Spitfire1

rrElite Veteran

Perth Australia

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Its really depressing because once these jets are flying there excellent fun to fly, even though this jet was a handful and I lost control and crashed, if I had had another few flights it would have been fantastic.

I had an RC lander f16 that was undescribably nice to fly, but the first 3 flights were hit and miss, maybe 1 in 3 chance of getting down in one piece, each flight after the odds got better.

I also had a composite HET f16 that cost me a small fortune, supposedly with the 6s power system I had it would fly right out of your hand, that also immediately flipped upside down and was completely destroyed.

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01-17-2011 01:05 AM  7 years agoPost 1653
fla heli boy

rrKey Veteran

cape coral, florida

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your new F-18???? Man you have trouble with jets!!!

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01-17-2011 01:09 AM  7 years agoPost 1654
Spitfire1

rrElite Veteran

Perth Australia

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The only success Ive had with handlaunch jets is with the 70mm RC Lander f16 and the 64mm Fweewing f35, even then each handlaunch was precarious at best.

If I can get hold of a 50mm fan from somewhere Il have another try, I have plenty of spare 70mm and 64mm fans from all the other failed projects, but too big.

fla heli boy

I keep meaning to ask if you ended up buying a plane yet.?

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01-17-2011 01:37 AM  7 years agoPost 1655
tryan02

rrProfessor

Canton, Missouri

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I have some guy's that can help on the first flight so that always helps. But for the life of me I cant see NOT launching full power. RC powers tells you to run 1/2 throttle at a 45 degree angle? Sounds like a stall to me? Should make for a good high alpha maneuver with no air over the control surfaces.

I have been searching hundreds of videos on the mini sabre and all the successful ones are at full power? I have also learned not to trust guy's who tell about the plane but dont fly it or crash on the first try.

No Really I am the club President!!!

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01-17-2011 01:59 AM  7 years agoPost 1656
Spitfire1

rrElite Veteran

Perth Australia

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Yeah I will be trying full power next time, listening to idiots in forums and also full throttle with my f35 would cause a dangerous dip made me think it was worth a try.

I was hopeing a such a small 3s jet like this would be easy to launch, something you can just throw in the car with your radio and a lipo and have some fun, even the ones Ive had some success with so far have ultimately been destroyed whilst launching.

Once in the air the jet was nice with plenty of power and speed, I just screwed up and tried to bank too hard when I was not used to the jet, it was also tail heavy, Im sure with a bit of fine tuneing it would have been a nice jet.

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01-17-2011 02:20 AM  7 years agoPost 1657
Dood

rrProfessor

Wescanson

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My Stryker with a new paint job. Just finished it tonight.

The underside has an orange "digital camo" pattern which resulted sort of accidentally.. It's a long story. Involves paints not sticking/ not covering.

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01-17-2011 02:40 AM  7 years agoPost 1658
Spitfire1

rrElite Veteran

Perth Australia

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The camo effect looks OK, its very hard to get paint onto foam, I tried water based acrylic paint once and it did not work very well.

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01-17-2011 02:43 AM  7 years agoPost 1659
Dood

rrProfessor

Wescanson

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It looks much better in person and in good light. It's not nearly as ugly as it looks. I can live with it.
I explain what happened here: (copy of post I made on club website)
The Stryker is ready to go, and is now sporting an all-new paint job..

Things didn't exactly go as planned on the underside. I wanted a blue leading edge, with blue and orange stripes. All paint used was Rustoleum.

The problem began when I realized the blue paint wouldn't adhere to the foam. I discovered this when I pulled off the masking tape, only to find 90% of the blue paint was pulled up.

It was impossible to remove all the blue paint. I used packaging tape to pull up as much of it as I could. When I pulled up enough, I went to cover the underside with all orange.
Since I couldnt get blue paint to stick to foam, I thought I could get the blue paint to stick to orange.. Sounds good on paper, right?

New problem: even with 3 coats, the orange fluorescent paint would NOT cover the blue...

But somethings happening here -- I'm building up a sort of digital orange camo pattern.. Looks kinda cool. Not great, but different. It has character!

I went with what I had, and painted the leading edge blue as originally planned. Here are some pictures---

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01-17-2011 03:31 AM  7 years agoPost 1660
Spitfire1

rrElite Veteran

Perth Australia

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the orange fluorescent paint would NOT cover the blue...
Thats the problem I had, I was trying to paint the underside of a previous blue f18 foamie with flouro yellow, light flouro colors dont go over blue very well at all.

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HelicopterOff Topics Planes and Jets › The official plank thread.
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