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Old Nov 17, 2012, 10:43 AM
A trail of smoke is GOOD!
waynemia's Avatar
USA, TX, Springtown
Joined May 2008
7,226 Posts
Quote:
Originally Posted by DaOldGuy View Post
There are several that have put nylon on them, smaller stuff. I do know 2 of our members that have went to nylon on the Saber Profiles. I would think the manufactures would get nagged at either way so they stick with what they know. I think the shear testing would be very time consuming to get the right size and amount of nylon bolts that would only break just short of the chassis failing, as for it not to fail too easy.
The topic comes up around the club from time to time. On the rare occasions that I have knocked the landing gear block out, it has been not too bad to repair. I would be PO'd if my gear fell off on a normal landing.

I only remember knocking the wheels off three times. My 50cc YAK with two-piece fiberglass main gear - I ripped one wheel off on the maiden because I was short of the field. I would never consider nylon on a giant plane anyway. The Kadet when I ran out of fuel and ran into a ridge trying to make it back to the runway - some chance that nylon would have snapped and made the damage a bit less, no one knows. The Twist 40 - Barbie, but the landing gear block had seen a little too much glow fuel so nylon would not have saved it anyway.

Back when I had my U-Can-Do 60, I had nylon bolts because I was naive and someone told me it was a good idea, I had a nylon bolt break in flight and my landing gear went sideways. My landing was OK but that was the end of the nylon bolts. I had a similar situation on my Wild Stick to be fair. I had a bolt come out in-flight. I am sure I had put blue loctite on it but I like to do touch and goes with it. I landed it without incident so it was no big deal.

So whatever one believes is fine with me. I am sticking with steel bolts.
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Old Nov 17, 2012, 10:43 AM
BEOWULF
North vancouver, B.C. Canada
Joined Apr 2008
18,875 Posts
Thanks for blow back explanation

I experiment with nylon bolts
Ones that cannot be inspected are not good to be used
If you see whitefish color fracture it is now weak

I love nylon bolts only because they can save plane in bad landing

The twist v2 gear needs opposite of nylon bolts but rather the orrigionl twist gear
Twistv2 is just Chinese cookie waiting to explode on fast touch and go or dive bomb into snow

My cub had metal bolts holding the wind on but after one landing that was just role over
The cab in the cub that wing bolts into got smashed up
Nylon most Likly far lesson damage in lots of cases for lots of bad landings

But when I do blenders with twist and other planes I want metal bolts

Blenders are cool with twist
Trely the fastest way to beat up planes
It's when you put full throttle then throw stick suddenly full out

The plane then turns like a blender really crazy

I am good at blenders as practicing for inverted flat spin contest
Gave me lots of practice

It's hard to find good medical grade nylon bolts that fit our planes
I like the white ones
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Old Nov 17, 2012, 10:55 AM
BEOWULF
North vancouver, B.C. Canada
Joined Apr 2008
18,875 Posts
[QUOTE=Waldopepperaxe;23289041]David bummer man kick that gout's butt hope you start feeling better soon,

Feeling better thank guys



Very interesting Wayne

I think your theory is correct

My wing has same exact issues

Even thought about installing all gear upside down in my wing
So the plane actually fly upside down all the time
But suspect this would not work because bottom is flat
Or would this work

Maybe this is the case for fast planes which are designed for fast
And leave slower ones to the max speed of plane

As I extensively tested wing to cure this
Short of hv servos

Elevens not getting air makes lots of sence

I even do sever changes in cg with no help

In high speed dives my wing likes to have really hard time with pull outs

The plane needs to be slowed down to pull out of dive

This problem is way worse when plane is heavier because of larger mah added or llarger battery weight
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Old Nov 17, 2012, 10:57 AM
BANG IT!!!
DaOldGuy's Avatar
United States, PA, Bellefonte
Joined Dec 2007
12,498 Posts
Mothership is semi semtrical flat bottom? Yes, delamination is very possible, that is more a lifting wing <lack or proper words> so if the cord thickness is high, going into a elevator up, much of the airflow is skipping the control surfaces.. This would be a very good test for the things Joe Smith puts on the leading edge of his planes, in slower flight it disturbs the air flow to keep flow on the wing. That would be in interesting test.

Nylon bolts for things like that is a long standing discussion. On the lighter build performance planes <first gen 70 slick> it is a very good arguement for nylon. To david's point of inspection, one should be changing them out now and then looking for issues.Since the LG on the slick is in a tight slot, being able to notice an issue can be easy to do.
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Old Nov 17, 2012, 10:59 AM
A trail of smoke is GOOD!
waynemia's Avatar
USA, TX, Springtown
Joined May 2008
7,226 Posts
Quote:
Originally Posted by David22 View Post
My cub had metal bolts holding the wind on but after one landing that was just role over
The cab in the cub that wing bolts into got smashed up
Nylon most Likly far lesson damage in lots of cases for lots of bad landings
I have seen my share of crashes, bad crashes, probably 90% of the time, the 1/4-20 nylon wing bolts do not break. Of the 10% of the ones that do, the wing bolt plate has been broken loose from the plane also. The implication is that if you have a crash that is severe enough to break the wing bolts, you have other serious problems anyway.
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Old Nov 17, 2012, 11:03 AM
BEOWULF
North vancouver, B.C. Canada
Joined Apr 2008
18,875 Posts
Twist planes come with nylon bolts

You guys change them to steel ones
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Old Nov 17, 2012, 11:04 AM
BANG IT!!!
DaOldGuy's Avatar
United States, PA, Bellefonte
Joined Dec 2007
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Not running Wheel pants when the gear snaps helps too. The matching pair of holes in the bottom of the wings suck. I run around pantless all the time.
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Old Nov 17, 2012, 11:27 AM
BANG IT!!!
DaOldGuy's Avatar
United States, PA, Bellefonte
Joined Dec 2007
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Anyone here handy with Mag Motors <not electronic ignition>?

I have a US Engines 35 going on the L 19 Bird Dog. It has a Champion RCj8 Spark Plug in it.

Problem one.
While turning the motor through I can here compression leaking around the plug, I dont wish to over torque so I will replace. With my finger over the hole there is no air noise.

Problem two.
I have NEVER liked the champion plugs so I am naturally going to look for an NGK replacement <BMR6A> I am thinking if memory serves the RCj8 is the resister version of the Cj8?
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Old Nov 17, 2012, 11:53 AM
3d NOOBular
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USA, UT, St George
Joined Aug 2010
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Wow lots of discussion

David you can also reduce blowback by making sure your servos have as much leverage as possible. To do this you need to maximize the end points in your tx so the servos are moving as far as the tx will push them. Then move the pus rod into the closest hole to the center that gives you the desired throw. You should try this before getting stronger servos.
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Old Nov 17, 2012, 12:00 PM
BANG IT!!!
DaOldGuy's Avatar
United States, PA, Bellefonte
Joined Dec 2007
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Quote:
Originally Posted by brathanke View Post
Wow lots of discussion

David you can also reduce blowback by making sure your servos have as much leverage as possible. To do this you need to maximize the end points in your tx so the servos are moving as far as the tx will push them. Then move the pus rod into the closest hole to the center that gives you the desired throw. You should try this before getting stronger servos.
That is soo true, many people think the radio can just do what you need but getting the best resolution from you servo is key and a manual process.
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Old Nov 17, 2012, 02:35 PM
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kerwin50's Avatar
winston mo
Joined Oct 2006
7,539 Posts
I always reinforce my landing gear block area.
Nate what size tank do you have in that slick. I can get 30 plus minutes on the green machine.
Well it's windy today. bummer
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Old Nov 17, 2012, 03:21 PM
3d NOOBular
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USA, UT, St George
Joined Aug 2010
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Quote:
Originally Posted by kerwin50 View Post
I always reinforce my landing gear block area.
Nate what size tank do you have in that slick. I can get 30 plus minutes on the green machine.
Well it's windy today. bummer
I get about 10-12 min out of my 8 oz fourtitude tank.
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Old Nov 17, 2012, 06:32 PM
A trail of smoke is GOOD!
waynemia's Avatar
USA, TX, Springtown
Joined May 2008
7,226 Posts
spitfire video failed on upload I guess. I reloaded it.

Spitfire RC Plane (2 min 54 sec)
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Old Nov 17, 2012, 08:26 PM
Registered User
United States, MI, Houghton
Joined Jan 2005
5,451 Posts
Blowback is necessary to eject the spent round and chamber the next....

Blowback is what you get when you pee into the wind.

Blowback is when you sneeze halfway through snorting a line. (So I've been told.)
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Old Nov 17, 2012, 08:57 PM
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kerwin50's Avatar
winston mo
Joined Oct 2006
7,539 Posts
Snowy you left out spitting into the wind.
Nate have you considered a 12 or 16 oz tank.
What little extra weight may save your plane.
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