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#1 DEAN GRADWELL Jun 02, 2010 09:18 PM

Me and my MXC
 
4 Attachment(s)
The thread title I have chosen seems to make the most sense as this is not a build thread but a few comments and photos on my gliders. Ideas from others will at least I hope to be noted.

There will be photos from two different gliders, one is new and the other has flown hundreds of miles and has survived a mid air.

The MXC comes from RnR products in Milpitas, Ca. They are know for many designs but the only ships I have flown other than the MXC is their SBXC and Millenium. RnR is responsible for cross country as we know it today. No one else has made the commitment they have.

#2 DEAN GRADWELL Jun 02, 2010 10:53 PM

6 Attachment(s)
More

#3 yyz Jun 03, 2010 12:52 AM

Thanks for posting that Dean. Velcro in the fuselage is a great idea.

#4 jgs99v Jun 03, 2010 12:46 PM

Dean - Thanks!!!!
Keep it coming wanna see more!
I like the metal strip on the skid - alum or SS?
Orientation for the Sky Melody in conjuction with 2.4 rcv and GPS unit? Any gotcha there you experienced?
Servo wires within the fuse from nose to fin - do you secure them? Is so any techniques you'd like to share?
Tow hook location and how to correctly measure CG - w/wings wo/wings?
Man tons of questions :D

cheers,

jack ~

#5 yyz Jun 03, 2010 01:38 PM

Jack,

All of these questions would suggest you'll be flying an MXC in a couple of weeks. That a good assumption?

Mike


Quote:

Originally Posted by jgs99v (Post 15234859)
Dean - Thanks!!!!
Keep it coming wanna see more!
I like the metal strip on the skid - alum or SS?
Orientation for the Sky Melody in conjuction with 2.4 rcv and GPS unit? Any gotcha there you experienced?
Servo wires within the fuse from nose to fin - do you secure them? Is so any techniques you'd like to share?
Tow hook location and how to correctly measure CG - w/wings wo/wings?
Man tons of questions :D

cheers,

jack ~


#6 jgs99v Jun 03, 2010 02:48 PM

Mike,

Sorry that is a team secret I'll have to consult them prior to releasing any information :D

Most likely we'll fly #8 version 2 and/or 3 - As this is what we have the most miles on. We've learned alot in the past few contests. So we'll see what the conditions deal us and go from there. But I've had my MXC for almost two years now. But you can never finish updating and making it better. This sharing that Dean is providing is key to that development - maybe I should also post what I've done as well. Don't know up to Dean if it helps or muddles:(

#7 DEAN GRADWELL Jun 03, 2010 08:05 PM

Please Jack join in. We all gain from it. After all this is about "Me and my MXC"

Regards Dean

#8 XC soaringpilot Jun 03, 2010 09:42 PM

Dean,

It looks like your antenna for the 2.4 radio is laying directly over the carbon strip in the fuselage or does it stop short of the carbon? Hard to tell from the photo. Obviously the carbon is not causing problems for you.

John

#9 DEAN GRADWELL Jun 03, 2010 11:11 PM

John,
I make sure the antenna stops short of the carbon strip. Use masking tape or velcro which has not been done on the new one yet.
regards Dean

#10 DEAN GRADWELL Jun 04, 2010 11:41 AM

2 Attachment(s)
Skid made from aluminum about 030" thick.
The vario antenna has been in several locations without a problem using 2.4. So far settled below battery floor as the way to do it.
Also wanted to mention have removed switches and plug batteries directly to receiver. The plywood mount and switches weighed 2 1/2 oz.
I make my own harness's using Tefzel mil-spec aircraft wire. Use 22ga. for pos. and neg. and 24ga. for the signal wire. For the tail run (61") I used one pos. and one neg. with two signal wires. This weighed 29 grams compared to 51 grams for twisted 22 ga. hobby shop wire. I shorten the servo leads when it makes sense, weight again. Remember a glider gains weight a gram at a time.
And If you think I'm overthinking this go to F3X group and read some of the build threads. This is where I learned about wires and weight. Some terrific minds in that group.

Regards Dean

#11 jason H Jun 05, 2010 03:46 PM

Oh how i'm green with envy.

#12 DEAN GRADWELL Jun 06, 2010 09:26 PM

3 Attachment(s)
Iv'e been using JR 368's for rudder and the ailerons. JR 9411's for elevator and flaps. Maybe a little overkill but you have to keep in mind the wing surfaces are skin hinged on the top and they are rather stiff especially the flaps. In fact you will not get flap angles that you could with the SBXC. It's a good trade off though as the upper surface smooth with no gaps.

#13 G Norsworthy Jun 07, 2010 10:23 AM

Dean,

Is the JR368 strong enough to pull the flaps at speed? I have found that some of the older standard size servos are not. This is a disaster as the elevator compensation kicks in but the flaps do not move and the plane dives.

Greg

#14 jgs99v Jun 07, 2010 11:52 AM

Greg - 9411 on flaps not 368
I have the same setup and dive testing was successfull - the contest before last when I had to land when you were spec'd out higher than I was. Landed in < 15 seconds :D.
I like the new LipoFE Dean has - waiting for the 4600's that is 8.2Ahrs -

#15 DEAN GRADWELL Jul 16, 2010 07:20 PM

4 Attachment(s)
More MXC stuff.


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