RE: Chip Hyde's Vision 3D
 

No its not wild, elevator feels actually really good. I almost wonder if it could go back even more?

RE: Chip Hyde's Vision 3D
 

At this point I'd start adding tailweight in small increments for a quick check... each flight adding another tad. Once you feel it getting "slippery" you can back it to where you like, mark the CG, then remove the tailweight.

From here you can adjust CG by removing noseweight, adjusting battery locations, etc until you reach the marked CG point.

Sure would save a lot of cowl removal/hassle until you have it where you want it. Plus it'll take so little weight addition to the tail to fine tune the CG that it won't be "flyably noticable".

As it is, I am just going to finish mine without worrying about CG... 4.5" back won't scare me at this point, but that's me...

J. David

RE: Chip Hyde's Vision 3D
 

Excellent idea. I'll take a few little stick on slugs of lead with me next time. If it still doesn't feel tailheavy, I can do just what you said. I'm sure it will be fine where it is, but if I can lose another 3 or 4 ounces off the nose, it would be nice to know that. And you're right, it's a drag taking that cowl off and on every time I want to pull another ounce off!

Tom

RE: Chip Hyde's Vision 3D
 

Flew mine today, was going ace. Getting 7500 on a Menz 22X8. Still a bit rich but I reckon I could get 10 mins out of a 16oz tank now (was 6 mins before!).

Think part of the problem with the rudder is that im getting blow back at high speed. Knife edge loops at low speed are easy but once you get a bit of speed on it just doesn't want to pull out. Im on an 8511 btw. Also noticed it in full power rolling circles so im now flying with rudder rates off the whole time to get a better feel.

Angus

ps any of you guys tried high octane petrol like Shell Optimax? Make any difference?

RE: Chip Hyde's Vision 3D
 

Wow, only 10 mins on 16oz eh? I'm getting 10 minutes on about half a 16oz tank... probably could get 20 mins of normal flying out of one 16 oz tank. 7500 on a Menz 22*8 sounds great... I don't know if I could get that or not. I'm getting about 7230 on an MSC 22*8, but that prop loads the motor a lot more than a Menz.

Not sure I understand what you mean by "blowback" on the rudder? [sm=confused.gif]

I've never tried high octane gas on any of these engines... I've always heard that you should stick to regular/low octane to keep from overheating? Don't really know.

Tom

RE: Chip Hyde's Vision 3D
 

10 mins on 8oz eh. Lovely!

Blowback is just when the surface doesn't move to its full deflection due to the servo having insufficient torque.

I wasn't sure how good 7500 was. It has had about 2 1/2 hrs running now so it's still early days (I’m ZDZ 50 btw). Engine starts great, is reliable and has plenty of power so I’m happy with it.

Just changed the voltage regulator. Up from 5.5 to 5.8V now. Not that much difference but it can only help. Shame JR don't do any mega torque servos. I was looking at some of the hi-torque Hitec servos but they are only really significantly more powerful compared to 8511 if you up the voltage a lot.

Angus

RE: Chip Hyde's Vision 3D
 

At 7500, I'd watch the head temp... That MAY be a tad too lightly loaded. Personally I'd switch to a 23x8 to get them down around 7100-7200... And it gives more thrust at less temp.

Perhaps one of the reason you are getting lower "gas mileage" is the higher RPM...

Also check you are not losing gas in flight from the vent somehow... if you have a pinhole or other air leak other than the clunk line the engine will run fine but you'll drop gas in the air everytime you roll or loop... a thimbleful at a time adds up over 10 minutes.

Literally you should be able to get around 25 minutes straight out on 16 oz mixed 32:1... a tad more I'd wager better on synthetic oil...

Just some thoughts...

RE: Chip Hyde's Vision 3D
 

Some one showed me a trick, I had the same problem with gas milage. I doubled my in air time by running my vent line out of the tank over the top of the fuel tank to the back of the tank and then back to the front of the tank then down and out. so what you have is a loop that sets on top of the tank before you run the vent line below the center line of your fuel tank. I was losing about 25% of my fuel in loops and invered flight.
Hope my explaination isn't to confusing.

Greg

RE: Chip Hyde's Vision 3D
 

Well ZDZ say up to 8000rpm but I admit it probably could do with a bigger prop. Probably get NX 23X8 or Mejzlic 23X8.

Also the way the tank is plumbed aint too hot either. Guy I bought it off has two vents running to the bottom of the fuz (fill through one, comes out the other) and I have suspected that fuel could be coming out of there. Will join the lines and put in a non return valve so it doesn't allow fuel out but air can get in.

Angus

RE: Chip Hyde's Vision 3D
 

Yeah I run 87 octane thru mine, I think I seen/read somewhere thats what DA said to run. I got mine leaned out now, so it runs forever on a 26 ounce tank, you bought get sick of flying. 20 minutes in air is long enough for me, I think I could go 30 if I managed throttle, but thats just silly.

RE: Chip Hyde's Vision 3D
 

Pic from other night.


http://img.photobucket.com/albums/v1...lif/Vision.jpg

RE: Chip Hyde's Vision 3D
 

Nice pic! What's that blue stuff behind your plane... we don't get that around here. :)

Tom

RE: Chip Hyde's Vision 3D
 

Yeah its been decent here, this weekend is suppose to be a wash, and right now is only good for a kite. Pic is actually kinda crummy quality, my bud took it with his new dig camera, not real clear I think. O well, it was free!

RE: Chip Hyde's Vision 3D
 

We've had just a few good days in the past week or so, almost 90 degrees at times. But, it's back to cold, dark and windy again... the weekend isn't looking good here either. [:'(]

Tom

RE: Chip Hyde's Vision 3D
 

What servo are you guys using on rudder?

Angus

RE: Chip Hyde's Vision 3D
 

I'm using the Hitec HS5995TG robot servo.

Tom

RE: Chip Hyde's Vision 3D
 

Is that the one that you can use up to 7.4V on? I was thinking about getting one but surely you need a separate rudder battery to power it on that voltage?

Also, anyone tried this affair from Hitec with the 5:1 gear box?:

http://www.servocity.com/html/robotzone_servos.html

Any good?

Angus

RE: Chip Hyde's Vision 3D
 

The geared items would not work well for RC aircraft applications except maybe scale accessories...

The gearing would take a .20 sec. servo and make is 1+ second... way too slow for surface reaction.

Things like rotating cannons, perhaps even landing gear, or maybe slowly rotating a static scale prop might be possible...

RE: Chip Hyde's Vision 3D
 

I am running JR 8611 in the whole plane. Hard to beat this servo for this price. I can't get myself to buy Hitec, I just had so much bad luck with them years ago, I know they have gotten better, but its just hard for me. They make some nice spec'd servos.

RE: Chip Hyde's Vision 3D
 

They do indeed. Think I’ll just stick to my trusty JR. Besides, I’ve just seen they've got a new 8611A out with a bit more torque and a stronger case so I’ll just wait until I’ve knackered this one then exchange it for this new beast.

Angus

RE: Chip Hyde's Vision 3D
 

Guys,

My tail tube is very loose at the back. It doesn't seem to affect it in the air but I would really like to tighten it up. Im thinking of either:

1) Running CA into the socket, smearing it around and then kicker it until I get a good fit.

OR

2) Go the whole hog and put on bracing wires.

What have you done, if anything, to cure this problem?

Angus

RE: Chip Hyde's Vision 3D
 

Angus,

I'm not experiencing that problem... mine fits just fine? Very tight in the stabs, and relatively snug in the fuse. Mine was slightly canted down on one side, so I did shim it slightly by adding a couple pieces of clear tape around the tube on one side of the fuse (before inserting tube in). I could barely squeeze the tube into the fuse after adding that little bit of clear tape.

Tom

RE: Chip Hyde's Vision 3D
 

It'll tend to loosen over time due to the stress of those stabs leverage during high G manuevers, snaps, walls, etc...

My DV was the same way... I found a single strip of cellophane tape was the right thickness to tighten it back up.

RE: Chip Hyde's Vision 3D
 

Its only had 21 flights!! Im very tempted to put on rigging wires actually.

Angus

RE: Chip Hyde's Vision 3D
 

Certainly wouldn't hurt.