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#1 3DNater Feb 07, 2012 09:34 AM

3DHS Fanatics!
 
If you are looking for a place to post about 3d hobby shop airplanes and get the latest information about what's up on the horizon with 3DHS you need look no further.

The vision/thinking for this thread is for it to become a valuable repository of information for those setting up or interested in setting up 3dhs planes. The format for this should be Questions and Answers between users as well as posting experience with such. Also, it would be really cool for members to take particularly useful posts from individual plane threads and repeat them here so others can benefit from them with less of a searching burden.

There will always be the temptation for users to include off topic posts but we ask members to please keep this thread as clean from that type of post as possible. If you do decide to post what you had for dinner or how hot your wife is, or how cute your dog is etc. you may find other users politely redirecting you to other threads where those posts are welcomed and encouraged. That being said, I don't expect people to refrain from normal social graces such as "please" and "thank you."

Please participate and spread the awesomeness!

-Nate

#2 marksextra Feb 07, 2012 09:36 AM

This should be just my kind of thread. thank you. :)

#3 3DNater Feb 07, 2012 09:38 AM

I'll start things off by repeating this noteworthy post from Ben.


Quote:

Originally Posted by blucor basher (Post 18907877)
Reprinting this from the 41" Edge thread. I thought you guys might like my checklist for when you are asked to fix a plane at the field.

I just was answering some questions in a different thread about setups, and I thought the following post might be helpful. One thing, PLEASE do not read any kind of tone into it. I pretty much fix model airplanes for a living, so I have seen it all and have fixed it all. When I go to fly-ins, people bring me all sorts of airplanes if they have a problem. I know how they fly, and I know going into a diagnosis that all I have to do is:

Make sure the asembly is correct

make sure the accessories are working properly

Make sure the setup values are correct

...and it will fly just like mine.

If someone walks up to my trailer at an event carrying a small plane and says they are having problems, I do listen to their individual story, but I still go through exactly the same checklist no matter what. It's the same checklist I do on my new planes, and yes I still find mistakes on mine sometimes even after flying RC for 31 years.

Here's what I do:

1.Grab every part of the airplane. Pull on every part. Make sure all hinges are glued. Make sure all control horns are glued into the surfaces (I see this a lot). Make sure the pushrod connectors are tight. I have seen every possible part loose. Whole tails. It happens. Check everything by pulling on it.

2.Most of the things the pilots are actually worried about (a gap at the back of a wing, whether they need to change the thrust line, lateral balance) do not matter and are never the problem.

3.I turn on the transmitter, remove the prop and power up the plane. I check high rates to make sure the ailerons move about 30 degrees up and down and are moving approximately the same amount. About half the time, I find that the ailerons are doing something wacky. It's always due to the pilot not understanding the flap programming on his radio and he's flying with flaps activated or mistrimmed and it's all screwed up. I have problems with this every time I buy a new radio too. Make sure you read the manual and understand this.

4. I check to make sure the elevator moves at least 40 degrees up and down, 45 is better. I grab the elevator at the trailing edge and try to move it up and down. There should be very little play. Sometimes I find a lot of play, normally due to a worn-out elevator servo. This is particularly common on HS-65MG because they tend to last a long time and go through several planes, so the top bushing is worn out. If I find this play (you can actually see the servo arm rocking back and forth as you move the elevator) I tell the pilot he needs a new servo before we can proceed.

5.I make sure the rudder moves 40 degrees or so each way (it's not critical exactly how far). If it moves slow or has trouble finding center or will not move all the way (I help it a little by hand and if then it moves all the way it's obvious) I know the tailwheel is causing drag. I go through all of this in the build videos about the tailwheel, but the easy fix at the field is unscrew the bracket on the bottom of the fuse. If that fixes the servo travel, I know. It can fly a few times without the bracket.

6.I take the transmitter and make sure it has 75% expo on all surfaces on high rates. The pilot usually does not have the right expo, and he usually argues with me. He says he doesn't like the expo, or that his friend had some other idea, or some guy on the internet said... Whatever. Everyone needs expo on high rates, whether they know it or not. Make sure it's negative expo on Hitec and Futaba radios. Positive expo on JR and Spektrum.

7.I check the servo endpoint adjustment.

**If it is a Dx6i transmitter, it's never going to be right. That's the way it is. That Tx will not drive servos as far as others, and this is a severe disadvantage. I can get the plane feeling OK, but not great, on a Dx6i. I tell the pilot this. Dx6i's are very much over-represented among pilots who are having problems.**

The endpoints should be very close to maxed out. Some radios will go to 120%, some to 140 or 150. Whatever, it just needs to be maxed out. Normally, it's not, because the servo arms are too long. I change the endpoints to maximum, and if I need to I put the servo connectors into a different hole in the arm so that the throw remains correct.

8.I look to see that low rates are about a third of high rates or so. It's not critical, but I do want to see 35% expo on low rates. Yes, they fight me on this, too.

At this point, I know the controls are setup properly. Almost done.

9.I check to make sure the prop is an APC E, Xoar PJN, or Vox, and that the pitch is 1/2 of the diamter. If not, I tell the pilot to get a new prop.

10.I put the battery in the midle of the tray and strap it down.

11.I hold the plane in my hand and go to full throttle, to make sure it has enough power to pull up out of my hand.

-----


That's it. I take off, trim the surfaces so that it will fly across the field hands off. I fly some low rate stuff then flip to high rates, harrier down, hover a little. I flip back to low rates and show the pilot how to land.

To land I fly at 1/8th throttle with the nose about 15 degrees down below the horizon. I fly along the runway, using the elevator to keep my nose 15 degrees down until it's about 1 ft high, then I cut the throttle and ease off the elevator slightly. Done.


The usual reaction is amazement. What the pilot doesn't usually understand beforehand is that the airframe is just a dumb piece of wood. It's the simplest part of the system. The odds that something is wrong with one of the dumb pieces of wood is very low. The odds that the problem is with one of these high tech parts is very high. I wish I could teach people that.


#4 Randidly Feb 07, 2012 09:38 AM

Okie dokie

#5 aronph Feb 07, 2012 11:04 AM

funny....i just sent arron a pm thismorning on this subject...i said the "fanatics thread" should be changed to the "3DHS Campfire" and he should start another thread called something like "3DHS Product Specific Thread"

#6 3DNater Feb 07, 2012 11:11 AM

Quote:

Originally Posted by aronph (Post 20670308)
funny....i just sent arron a pm thismorning on this subject...i said the "fanatics thread" should be changed to the "3DHS Campfire" and he should start another thread called something like "3DHS Product Specific Thread"

I like the sound of that. I'm going to change the name to reflect the idea of "product specific." rather than setup. And Whoosh evolution just happened!

#7 3DNater Feb 07, 2012 11:12 AM

shoot I'm not as adept as some (km) I don't know how to change the name lol

#8 theKM Feb 07, 2012 11:17 AM

Quote:

Originally Posted by brathanke (Post 20670391)
shoot I'm not as adept as some (km) I don't know how to change the name lol

click on the edit button of your first post, then click "go advanced". on that next screen you can change the title. woot woot.

#9 theKM Feb 07, 2012 11:18 AM

that list from Ben is a pretty good one...

#10 3Dplank Feb 07, 2012 11:24 AM

Just subscribing:D

#11 Park_aviator Feb 07, 2012 11:33 AM

Quote:

Originally Posted by theKM (Post 20670467)
that list from Ben is a pretty good one...

mmhmm.... never knew that about my trusty dx6i..... I need to change my setup...

#12 SnowDog1974 Feb 07, 2012 11:48 AM

Quote:

Originally Posted by brathanke (Post 20670376)
I like the sound of that. I'm going to change the name to reflect the idea of "product specific." rather than setup. And Whoosh evolution just happened!

How does calling this thread the "3DHS Product Specific" thread help?
My first thought on hearing that is that there is already a product-specific thread for each airframe. :confused:

#13 3DNater Feb 07, 2012 11:53 AM

Quote:

Originally Posted by SnowDog1974 (Post 20670764)
How does calling this thread the "3DHS Product Specific" thread help?
My first thought on hearing that is that there is already a product-specific thread for each airframe. :confused:

Only in the sense that this one is more general in nature and may serve as a repository for things that most of these planes have in common. I don't anticipate this thread to move nearly as quickly as the other threads.

#14 aronph Feb 07, 2012 12:04 PM

it should not....should just be like product update info and setup stuff....things that are generally 3DHS specific related issues

#15 theKM Feb 07, 2012 01:30 PM

Quote:

Originally Posted by aronph (Post 20670939)
it should not....should just be like product update info and setup stuff....things that are generally 3DHS specific related issues

so, couple more PM's, more ideas from the masses...

...how about, this thread be simply on-topic chat about 3DHS whatevers. have it take over the title of the "3DHS Fanatic", and it's all chat and fun that is on-topic to flying a certain brand of airplane. Then in line with Aronph's plan, turn the thread I started into a whatever thread, call it "3DHS Fly-Low Thread" or something, and it houses all the rambunctious fun that we've been known can happen.

that way people who want a general chat thread about a topic can get a high yield and easier to follow thread full of info... and those that want a whatever chat thread and want to see if they can keep up with the nonsense can get that too.

this sound cool?


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