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AJ-2 Construction Revisited

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Old 07-13-2012, 08:00 PM
  #76  
PylonDave
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Default RE: AJ-2 Construction Revisited

Looks Great as usual Scott!!
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Old 07-14-2012, 06:52 AM
  #77  
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Default RE: AJ-2 Construction Revisited

About 6 ounces of clear coat was mixed for application. Roughly 2 ounces of fast reducer was added.

An inexpensive spray gun was used to apply the clear coat. The pressure was set at 30 psig.

A very light coat was applied initially. This was allowed to dry about 10 minutes. This was followed by several more coats. Just keep spraying until the surface is shinny. then stop.
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Old 07-14-2012, 05:43 PM
  #78  
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Default RE: AJ-2 Construction Revisited

The following pictures shows cutting free the ailerons and hooking up the aileron servo:
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Old 07-15-2012, 05:47 AM
  #79  
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Default RE: AJ-2 Construction Revisited

After about 24 hours the clear coat can be polished.

Begin by removing dirt and other imperfections with wet-and-dry sandpaper (800 to 2000 grit).

Follow with a medium grit polish and end with a wax.

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Old 07-15-2012, 02:08 PM
  #80  
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Default RE: AJ-2 Construction Revisited

Here is a picture of the tubing for the engine kill.
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Old 07-15-2012, 03:36 PM
  #81  
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Default RE: AJ-2 Construction Revisited

The cowl goes around the engine and is held in place with clear tape.

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Old 07-15-2012, 03:38 PM
  #82  
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Default RE: AJ-2 Construction Revisited

The servos easily fit 3 wide. There is lots of room for radio in this model.
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Old 07-16-2012, 06:36 PM
  #83  
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Default RE: AJ-2 Construction Revisited

Here are a couple pictures showing radio installation:
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Old 07-16-2012, 06:39 PM
  #84  
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Default RE: AJ-2 Construction Revisited

Check the tank in water to insure both sides do not leak.

A piece of pushrod was taped to the tank to keep it from sliding forward.

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Old 07-16-2012, 06:41 PM
  #85  
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Default RE: AJ-2 Construction Revisited

The tank will initially be located approximately 3/4" above the wing.

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Old 07-16-2012, 06:43 PM
  #86  
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Default RE: AJ-2 Construction Revisited

The fuel supply and muffler pressure are located just behind the cylinder head where they are easily accessible.
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Old 07-19-2012, 06:04 PM
  #87  
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Default RE: AJ-2 Construction Revisited

After a few short weeks the first AJ-2 is complete.

This one weighs in at 66.1 ounces or about 2 ounces over minimum.

I wish I was closer to Muncie for some test flying!

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Old 07-21-2012, 05:07 PM
  #88  
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Default RE: AJ-2 Construction Revisited

You did a great job!!!!
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Old 07-22-2012, 05:36 AM
  #89  
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Default RE: AJ-2 Construction Revisited

The other AJ-2 was painted.

Krylon was used for the black trim. A light coat was applied first. This was followed by a couple more until the paint covered. The trim was allowed to dry for several hours. This was followed by wet sanding the trim to make it blend in.

A spot type clear coat was applied over the entire surface.

This one has no decals, in case they cause turbulence over the leading and trailing edge, which can slow down the model.


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Old 07-22-2012, 10:30 AM
  #90  
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Default RE: AJ-2 Construction Revisited

I couldn't see how they would slow it down, they say FASST right on them! Great looking planes as usual Scott, have fun with them.
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Old 07-28-2012, 04:53 PM
  #91  
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Default RE: AJ-2 Construction Revisited

There is at least one disadvantage for a yellow airplane.

The yellow color attracts wasps, bees, and other insects.
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Old 08-06-2012, 06:52 PM
  #92  
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Default RE: AJ-2 Construction Revisited

Here are a few pictures of the completed pair of models:

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Old 08-20-2012, 08:38 AM
  #93  
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Default RE: AJ-2 Construction Revisited

A few test flights were made this weekend:

1) I settled for a CG location around 2 5/8" to 2 3/4" back from the leading edge. This provides very satisfactory elevator response on both high speed and landing approach.

2) The elevator throw (on low rate) is approximately 1/8" in each direction. For high rate the throw is approximately 3/16" each way.

3) The rudder throw (on low rate) is approximately 3/8" in each direction. For high rate the throw is approximately 7/8" each way.

4) The aileron throw (on low rate) is approximately 3/16" each way. On high the throw is approximately 1/4" each way.
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Old 08-20-2012, 08:47 AM
  #94  
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Default RE: AJ-2 Construction Revisited

The landing gear was initially moved rearward to reduce model bouncing on landing. This proved to be too far back and the location in the pictures should not be used. It is easy to nose over in the referenced position.


http://www.rcuniverse.com/forum/fb.asp?m=11094847

The stock landing gear location should be used. The stock location is about 1/2" further forward than shown.
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Old 09-09-2012, 03:39 AM
  #95  
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Default RE: AJ-2 Construction Revisited

I made a couple more flights yesterday. Both models were flying very fast and tracking well.

I'm planning on having them both dialed in for the Wichita (Goddard) race this next weekend (September 15th and 16th).

See you there! [8D]
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Old 09-18-2012, 08:54 AM
  #96  
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Default RE: AJ-2 Construction Revisited

Several more test flights were made on the AJ-2 this past week.

In my opinion the AJ-2 is just as fast as any of the current selection of composite models.

With some better flying this model will win races!

Kevin - You have another winning design!

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Old 10-22-2012, 12:50 PM
  #97  
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Default RE: AJ-2 Construction Revisited

At the Goddard (Wichita) race I raised the tank as high as it would go. This resulted in an engine run that was strong from start to finish.

The following pictures show the tank installation. The tank is roughly 1" above the wing.

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Old 11-27-2012, 05:31 PM
  #98  
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Default RE: AJ-2 Construction Revisited

If you are interested in a winter project, give Matney's Models a look.

I got another AJ-2 kit to replace one I sold.

Each take around 20 to 40 hours to build. Figure about $100 more to finish (plus radio and engine).

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Old 12-23-2012, 07:40 PM
  #99  
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Default RE: AJ-2 Construction Revisited

I'm planning on some serious practicing at the Basin so I'll need some spare racers.

Here's another AJ-2 on the build.

The following pictures show wing skin construction.

The set of 4 skins weighed 5.15 ounces. Medium to heavy wood was used on the top skins. Light wood was used on the bottom skins.
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Old 12-23-2012, 07:45 PM
  #100  
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Default RE: AJ-2 Construction Revisited

The wing went into the vacuum bag. An electric blanket warms the finishing epoxy (in the cold garage) enough to dry overnight.
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