RE: CGRCJets A-10 Build Thread
 

Jim
Whats the typical weight of one of your fans systems? I did not realize these were the new dynamax.

chris

RE: CGRCJets A-10 Build Thread
 

The fan system weighs 3.25 pounds, but that is actually just a bit lighter than the Dynamax with OS.91 and pipe. This system is designed to run on 10S to 18S. These are some serious power! We use two in our Byron F-15s (the old 9' long birds). They weighs 44 pounds, and we discovered over the weekend after a controller failure that they fly fine on one fan (16 pounds of thrust). One of the F15s was radar'd at 134 MPH at the E-Jets event in Ohio. Also while there, I set the fastest pass with my Starfire at 199MPH using a 15S setup (22 pounds of thrust, 330MPH efflux velocity). Jim Martin has a 52 pound Fly Eagle F-14 Tomcat with two of our fans, flying it with authority.

We chatted with Lowell at the Sun Valley jets event about this airframe. I think it would be excellent candidate for the fan system. I watched the video of the Haoye fan run up. The Dynamax has 11 blades, so it looks (and really sounds) much more like a turbine.

Website link:

http://www.xtremepowersystems.net

Info about the fan is linked to on the front page.

RE: CGRCJets A-10 Build Thread
 

Based on the weight you gave, I figure weight with two of our fan systems using dual 10S setups to be around 22 pounds... and at least 24 pounds of installed thrust. Might be a bit much. :)

RE: CGRCJets A-10 Build Thread
 

I would like more information on this A10.

Thanks,

itzbear

RE: CGRCJets A-10 Build Thread
 

I found the information needed. Looks like a real good plan. I would like to see it fly.

itzbear

RE: CGRCJets A-10 Build Thread
 

Hi itzbear
Here is a link to an add that has just expired and in it you will find some links to a few videos. I have been busy but hope to get some better video up soon.


http://www.rcuniverse.com/market/item.cfm?itemID=573176

thanks
chris

RE: CGRCJets A-10 Build Thread
 

If anyone wants to sell theirs, please let me know. Optionally, if someone is interested in building one for us that is something we are interested in too.

RE: CGRCJets A-10 Build Thread
 

Hey Sic
I am just now starting to build an A-10 for Tam. Here are a few pics of how to cut out for the mains retracts. This will hopefully be a quick build and i will try and log as much as i can to help you guys out. I am getting ready to pull the pylon molds as well and i am shooting for 2 weeks on this build.

chris

RE: CGRCJets A-10 Build Thread
 

HI Chris,
This thread has been really fun and even helping me with my MiboA10.

Do you happen to have any shots of the bottom fuse position light anywhere?

Thanks
Dave

RE: CGRCJets A-10 Build Thread
 

Hi Dave
I am glad you are enjoying the thread and finding it helpful for your build. Gen. 4 ?

As far as the light you are talking about, i do not recall a light on the bottom of the fuse. There is a position light on the tail, a dorsal formation light behind the canopy, wingtip lights, and flood lights on wing racks 1 and 11 for illuminating the nose for night refueling. Maybe i am missing something. Which area is this light that you are talking about in.

thanks
chris

RE: CGRCJets A-10 Build Thread
 

Started hinging the flaps today and heres how i did it.

-Sanded all hinges, front and back up to the black line with 60-80 grit sandpaper with a sanding block.

-You will have to drill out each hole on the hinge with a bit that fits the socket head cap screws that link the 2 hinges together. Not sure the exact size of this bit, but it is shy of 1/8". Practice on some other material to make sure these screws fit snug. You dont want any kind of slop.

-Cut back the skin on the wing and flaps where the hinges sit. Cut it wide enough for the hinge and all the way down to the ply so the hinge sits flush and flat.

chris

RE: CGRCJets A-10 Build Thread
 

-Clean out the glue fillet with a dremel so the hinge can sit as close to the skin as it can. This only needs to be done on the bottom and front where the hinge sits.Take it down until it is flat with the ply. Be careful!!! Dont let the dremel get away from you. I did not do this to the flap wells on the wing itself because the hinges sit a little further away from the skin but it would not hurt to clean them up.

-Sand out the flap wells and flap ends where the hinges go. There is epoxy still in these areas when i closed out the wings so for a better bond you will want to sand the epoxy down.


-Fit the hinges up to the actual flaps first. There will be about 1/16" gap around the bottom to front of the flap skin and bonding area of the hinge. The bottom and front part of the hinge have the same profile as the flap, so just leave an even reveal around it.

chris

RE: CGRCJets A-10 Build Thread
 

-I used 5 minute epoxy mixed with a little bit of 1/8" milled glass because i am impatient. You can use the glue you want. With the cold weather today, cure time was actually about 10 minutes. I put a decent amount of epoxy on the hinge so it will squeeze through the slot in the middle of the hinge and out the sides where i can smooth it in and create a little fillet. I angled the hinge in just a tiny bit to where it will meet up with the opposing hinge at the hinge point. Like i said, just a tiny bit. About 1/32" offset. Just eyeball it. Clean up excess epoxy on outside of hinge and let cure.

chris

RE: CGRCJets A-10 Build Thread
 

-I then masked off the hinge on the flap so the opposing hinge does not get glued to it.

-I used an extra hinge as a spacer between the 2 hinges and used the socket head cap screw to tighten them snug enough to where i could still move all 3 of them.

-In order to get these hinges in to the opening you have to have the flap in the down position so you can bend them past the wing skin and slide them in.

-Glue one hinge at a time and hold the reveal until the epoxy sets. I used a mixing stick and wedged it between the hinges so it would put pressure against the hinge being glued to the flap well. Make sure the 2 opposing hinges are flush up and down with one another.

chris

RE: CGRCJets A-10 Build Thread
 

-The reveal will have a bit more of a gap in the center where both flaps meet up. This is how it looks on the real A10. When gluing the hinges in i just held the reveal evenly until the epoxy set.

-Real A10

-Hinged flap

RE: CGRCJets A-10 Build Thread
 

-The outer flaps are a little more challenging i think because of the taper. When you put the hinges on the outer flap itself, the 1/32" angled offset may not apply like the inner flap. The hinges are 90 degrees with the bottom of the wing in this area on the outer flap. I just eyeballed them and set the flap in its opening to where it looked like it would work best and let the epoxy set.

-In the first pic ,i had to sand away the area i am pointing at in order for clearance. I had to take away the skin and a bit of the hinge. It is the part that goes into the well. If you have a problem with hinges binding, you can take a small drum sander and shave them back a bit. When you glue the hinges in make sure they do not stick out past the skin. You want them to be back behind the skin so the chance of binding is less.

-I took some sandpaper and carefully cleaned up the reveals.

-Finished wing flapping.


chris

RE: CGRCJets A-10 Build Thread
 

I also applied the backing for the servo covers. I used a 1/16" thick g10 type material. I am sure some good quality ply would work fine as well but its hard to strip out the laminate. Sanded both surfaces to be glued and CA'd them into place. Put the covers into place and use the pre drilled holes to pilot out a 1/16" hole through the g10 material for the #2 screws.


chris

RE: CGRCJets A-10 Build Thread
 

The aileron covers will go on like this. The linkage runs through the outer pylon.

RE: CGRCJets A-10 Build Thread
 

To make it a bit easier with all the clutter, servo mounting to these plates and slat installation on the wing is on page 5. Hope that saves you a bit of time looking for it when you are wanting to finish setting up your wing.

chris

RE: CGRCJets A-10 Build Thread
 

After the 3rd attempt and redesigning I am finally laying up the first side of the pylon molds tomorrow. No turning back now, they are waxed up and parted ready to go. I had also drawn up the cad file this morning and cut out the first formers for the pylons today (like i said these are practice and i will be making some adjustments, they will look better). The pylons will be solid on top with the wing curvature and open on the bottom. I will be gluing in a couple ply points in each pylon when i close them out for the areas to be screwed to the wing. The bottom former will need to be glued in with a couple hard points (maybe basswood for some extra backing)to be installed for the ordinance. I may install these when i close it out to see how easy it is to identify where the ply points are. If they are easy to find i will glue these in for you.

chris

RE: CGRCJets A-10 Build Thread
 

I want some...:D

RE: CGRCJets A-10 Build Thread
 

The ailerons

-Drill out the 3 inset marks where the hinges go on the wing and ailerons. Put hinges in place. Dry fit to make sure eveything lines up good.

-I used 5 minute epoxy and made sure the hinges were glued parallel and out the same distance for smooth operation.

-After the epoxy set, i put some more epoxy on the back side where the hinge comes through.

-Glue hinges and aileron to wing and hold in position until epoxy cures. Glue backs of hinges


chris

RE: CGRCJets A-10 Build Thread
 

Contol horn for aileron

-Drill out a 1/16" hole for clevis.

-Scuff up post the whole post of the control horn up to the line that i marked.

-Use straight edge and marked where i need to install control horn in line for servo.

-Cut out slot just big enough for the post with 1/16" cutter on dremel. Make sure you cut the slot out behind the ply in the aileron and up to the ply as the front of the post will be glued to the ply.


chris

RE: CGRCJets A-10 Build Thread
 

-Scuff up the outside of slot

-The control horn post is a little long and will need a little trimming with some tin snips. One of these days i will get around to fixin the cut file so these do not need to be trimmed. Cut off a small amount at a time as the post will need to hit bottom where it will also be glued for extra strength.

-There is a bead of glue along the inside former of the aileron so you will need put a small miter on the bottom front of the control horn post after you cut it to length to clear this bead. Make sure you are not hitting the post on this bead when you are fitting it up because you may cut it to short.

-I used a small file and inserted it into the slot until it hit bottom, marked it with my finger to gauge the length.

-Almost finished setting up the wing

-Dropped some glue on the inside of the slot and put a good amount on the control horn post as well as a bead of glue on the outer flange and skin. Marked with permanent marker, you will need to cut a small slot for the control horn to clear into the wing.

chris

RE: CGRCJets A-10 Build Thread
 

All control horns will be glued like the aileron, to the internal ply formers and inside of the opposing wing skin besides the flap horns which have no former in the to be glued area. Here is a diagram of the flap.


chris