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Old Sep 08, 2014, 04:30 PM
mkpatrick
Joined Mar 2011
1,238 Posts
Edited with more recent info...

I've been trying to learn about retracts and I guess I have to ask some questions about these retracts.

So I've been measuring and researching.
Using some ideas I got here on this thread with using spacers and different tires for a softer touch on the struts, I tried some things last night on the bench.
Using a Dubro Lo Bounce tire which is 2 3/4", I fit up those on the strut and they rub on on the gear door. I noticed the gear door fits onto the strut with the aid of a rubber bushing in there. I figure the bushing must provide tension on the screw to help prevent loosening. It also makes for a bit of an adjustment window I think.
I used a flat washer on the strut side of the wheel to space it a tiny bit away from the gear bay door. Then 2 more on the inboard side of the wheel between wheel and the C-clip. This keeps the wheel from shifting from side to side so much. Still spins freely.

For the strut; I set the strut using the grub screws and tried retracting the gear on the bench until it operated well after some adjustments. This is on the strut that still has the stock wheel. When I could see all the gear bay doors were coming closed nicely and there was no bind, I marked the strut where it enters the retract. I then found some make shift spacers. I used a prop spacer, an unused wheel collar and a washer to get about the length I needed, which is about 10mm. This is the distance between the retract and the plastic part of the strut. I did this so if I have a hard landing, the strut isn't going to compress back into the retract farther as easily. When it hit hard from my less than good landing, it knocked itself further into the retract slightly, causing retract action to bind.
I tested that out and the retract action still works fine, the spacers aren't impeding any mechanical motion.

Now I have the Dubro's on the struts. With the washers on the axle, they do not rub on the gear bay doors. I retracted the gear then tightened the gear bay door screw until it fit very flush.
I am waiting to test fly this. I am uncharacteristically optimistic.

When shopping for parts, it often references a motor size....
Some products say for a .40-.60 size.... I don't know what that means exactly, I thought it has something to do in reference to gas motor size?
I look at wing span in inches or metres for size, for example, FMS 1400mm T-28.
What size would this plane compare to? A .60 size?

Looking for advice from readers of the thread before I fly it. Is there anything obvious I did wrong there? (Other than landing too hard)
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Last edited by mkpatrick; Sep 09, 2014 at 11:28 AM.
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Old Sep 10, 2014, 12:48 AM
Registered User
United States, CA, Elk Grove
Joined Jan 2012
96 Posts
Quote:
Originally Posted by rcplanenoob78 View Post
any one have any suggestions on how to bend the nose gear if you don't have a vice?
I just went through this. Check out my blog post here:
http://rcflyingfun.blogspot.com/2014...ar-repair.html
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Old Sep 10, 2014, 11:32 PM
no catchy phrase
United States, AK, Wasilla
Joined Feb 2013
192 Posts
thx jgroetsema, I will give it a look .
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Old Yesterday, 11:23 PM
Northern California
United States, CA, Lincoln
Joined Oct 2013
22 Posts
Can anyone suggest good rates and expo for ailerons on this one?
I'm taking mine up tomorrow and I don't have the time to read 100s of pages.
I know how to fly but I like to start off easy with a maiden. I'm thinking 60% and 20 expo on the dx8- anyone wanna chime in and help me out?
Much appreciated.
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Old Yesterday, 11:28 PM
Northern California
United States, CA, Lincoln
Joined Oct 2013
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I guess while I'm asking might as well try to get elevator/rudder too-
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Old Yesterday, 11:30 PM
Your Pilot Ryan
ryramZ's Avatar
United States, IN, South Bend
Joined Nov 2008
3,299 Posts
Quote:
Originally Posted by JackfromNorCal View Post
Can anyone suggest good rates and expo for ailerons on this one?
I'm taking mine up tomorrow and I don't have the time to read 100s of pages.
I know how to fly but I like to start off easy with a maiden. I'm thinking 60% and 20 expo on the dx8- anyone wanna chime in and help me out?
Much appreciated.
set high and low rates. Personally I'll almost always default to a 70% low with 20 expo and a 100% high 20 expo. If it's a twitchy bird i'll bump up the expo. When it's calm out I'll grease her in on low rates, but if its windy I like having the extra authority on the controls.
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Old Yesterday, 11:33 PM
Northern California
United States, CA, Lincoln
Joined Oct 2013
22 Posts
Sounds great I'll go with it
Thanks for the righteous comment and not some smart aleck one.
I'll worry bout flaps and all else later
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Old Yesterday, 11:51 PM
Your Pilot Ryan
ryramZ's Avatar
United States, IN, South Bend
Joined Nov 2008
3,299 Posts
Quote:
Originally Posted by JackfromNorCal View Post
Sounds great I'll go with it
Thanks for the righteous comment and not some smart aleck one.
I'll worry bout flaps and all else later
What battery are you using? Many of us like the battery more forward. Here's a visual.
FMS 1400mm T-28 Trojan Mods (8 min 58 sec)
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Old Today, 12:00 AM
mkpatrick
Joined Mar 2011
1,238 Posts
I use 30% expo and 100% rates. I set a low rate at 75%, a mid rate at 90% then 100%.
This is after I've set the control surfaces up to be at neutral from a mechanical standpoint. I stirred the sticks, then adjusted the control rods to the control horns so that it was trim. I used a straight edge.
Then I set the control surfaces to move an equal and proportional distance to each other via the transmitter.
So far, I've never needed to come off full rates. Even at high speed, I can yank the elevator to full up and it responds like it should. No AOA stall, it doesn't tip out of the maneuver either.
I flew it today on a 4000 mAh pack with 40C. It flew like a BOSS.
The high speed low passes were impressive. Other people at the field stopped what they were doing and watched it.
I like pulling up gracefully into a steep climb and then going inverted and holding that for a moment, then I throttle off and pull elevator into a dive to end up in another low pass.
This plane has a commanding presence in the air.
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Old Today, 12:27 AM
Northern California
United States, CA, Lincoln
Joined Oct 2013
22 Posts
I've got some 4s 3300 nanotechs I'm gonna use
I've got everything level and squared away
Should it go all the way forward or back? Only talking about and inch here
Thanks for the response...
I like to start off soft.. I'm thinking 70 may be good but I might set 60-75-90 with 20 expo
Ailerons are all I'm worried about really
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Old Today, 12:35 AM
Northern California
United States, CA, Lincoln
Joined Oct 2013
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Any idea how much time I'll have?
I guess I'll give it a 6 minute timer to be safe
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Old Today, 07:13 AM
Captain Coolite
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Meringandan, QLD , Australia
Joined Jan 2011
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Quote:
Originally Posted by JackfromNorCal View Post
Any idea how much time I'll have?
I guess I'll give it a 6 minute timer to be safe
Yep, agree, go conservative to begin with, then note how much you put back into it, and how hard you flew it.

Incidentally, i use 65% low rates on all surfaces! and 100% high rates. I also use 30% expo. Works well for me.

Good luck with it mate.

Rob
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Old Today, 07:26 AM
Registered User
United States, TX, Midland
Joined Apr 2012
80 Posts
Control Throws

I've been flying mine for a year now and this is my setup:

Ail-19mm
Ele-20mm (30% Expo on all)
Rud-20mm
Flaps-25mm (full)

I'm using a 3600 mah battery and I fly 6:30 minutes.

Be sure your CG is correct. My battery is all the way forward in the slot and I still had to add 1 oz to the nose. I thought about cutting the front of the tray off and moving the battery forward (I just never did).

This is a great flying plane.......you'll love it.
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Old Today, 09:03 AM
mkpatrick
Joined Mar 2011
1,238 Posts
Quote:
Originally Posted by JackfromNorCal View Post
Any idea how much time I'll have?
I guess I'll give it a 6 minute timer to be safe
With my 4S 3300, I'm going 6:30 and it's pretty spirited flying. Lots of WOT low passes with a steep climb and split S.
I have about 30% left and the battery is pretty warm.
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