RCU Forums - View Single Post - Four star build
View Single Post
Old 05-09-2005 | 07:37 AM
  #81  
bubbagates's Avatar
bubbagates
My Feedback: (32)
 
Joined: May 2004
Posts: 8,635
Likes: 0
Received 2 Likes on 2 Posts
From: Elizabethtown, PA
Default RE: Four star build

ORIGINAL: Pilot Chad

Ken,
I think this will have to do. It is pretty much the same as minnflyer says accept more bays... I had to do this when i took out that orignal servo box/tray. The rib broke from that stupid CA. What will this do to the wing haveing the 2 out? And bruce told me to go in that area.
Chad,

First off let me say I am not "picking on you" I am just noting my observations. Take them anyway you wish. It's usually not in my nature to be negative, but to be positive.

I have sat back now and just watched this thread for a little while. It's pretty apparent that getting you to slow down and think things through will be a major chore. That's sad because 1.) you are a decent young man, 2.) you are building a very nice and forgiving plane, 3.) Everyone here is giving you great input.

Now, if you continue to just go ahead and do whatever you feel like AFTER you asked the question, then most people will not answer you anymore and that's not good. RCU is an unbelievable source for information, use it, listen to it.

Now as far as your wing goes, that plywood plate is to big and is going to add way too much weight and you will need to do EXACTLY the same thing on the other wing just to get the lateral balance to work out. It may be similar to the recommended design, but it is not what was called for. You went with 2 bays instead of one.

Removing the stringer was not a good thing to do, next to the main spar, that is a very important structual piece. If you piece a new one in that will be not much better, this should really be one straight piece from the root to the tip.

I see no protection at this time for the servo cable. If you leave that cable like it is right now, you can count on that cable being cut into by the wood. Hence you will lose aileron control and possibly create a glitch that goes right back to the receiver and if either happens, just grab a seat and watch the crash. [:'(]

It also looks as though the balsa sheeting near the root is warped or not glued down well.

Now as far as leaving the servo "glued in" that is also not a good thing, rubber mounts or not, you just removed the reason for them. Servos are to be mounted tight, but not so tight that you crush the rubber. If you do you took away the vibration dampening and you will see that servo slowly destroy itself over time from vibrations. Gluing them in is the same as overtightening the screws going through the rubber mounts.

At this point, you still have a wing that is repairable. It's going to cost you a little bit of time and maybe a few dollars but it can be done. If you continue as you are, it will get to the point that no amount of work will make the wing do it's job correctly and at the most inconvenient time it will fail. Heck, at this point if you were to finish it the way it is, you can count on the wing folding on your first hard pull-up.

The 4* series of planes are great planes and very forgiving, but they must be built logically to fly that way. I cannot stress enough that I am not picking at you, I as well as everyone else, want to see you succeed.

If I have mentioned items that were already dealt with then please accept my apologies.

I'll get off the soapbox now...