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Q-500 Racing Discuss AMA 428, AMA 424, and any other variants of Quickie 500 racing

Mad Dog Thread

Old 09-13-2009, 07:12 PM
  #51  
sahartman21
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Default RE: Mad Dog Thread

Sand the wing to remove the majority of the Spackle.

Use a tack rag to remove the dust.
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Old 09-13-2009, 07:16 PM
  #52  
sahartman21
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Default RE: Mad Dog Thread

I used some Klass Kote white primer on the model.

You mix it up and allow it to set about 40 minutes prior to adding reducer.

I used an inexpensive spray gun purchased from Harbor Freight.
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Old 09-17-2009, 10:57 PM
  #53  
sahartman21
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Default RE: Mad Dog Thread

I had a busy couple days finishing this model for the Wichita (Goddard) race.

It may be yellow but it isn't scarred! [8D]

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Old 09-17-2009, 11:03 PM
  #54  
sahartman21
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Default RE: Mad Dog Thread

Here are a few more pictures.

A Tettra 4 ounce tank is used as a CG tank.

The tail surfaces are configured similar to a Viper and have exposed control horns. I suspect the net impact on speed is insignificant for a 424 model.

Some JR Sport MN48 servos are used for the tail surface and throttle.

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Old 09-17-2009, 11:05 PM
  #55  
fizzwater2
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Default RE: Mad Dog Thread

lookin' good, Scott - hope to see you there. Got home from vacation late last night, have lots of catch up chores around the house to do, but made good progress today..
Old 09-18-2009, 10:23 AM
  #56  
PylonDave
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Default RE: Mad Dog Thread

Scott, Looks great!!!
Does the Madog allow for internal linkages??
Old 09-20-2009, 05:41 PM
  #57  
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Default RE: Mad Dog Thread

Some folks have used internal linkages on the Mad Dog. In my opinion it is a little tight for internal linkage.

Kevin's (Matney's Models) other Q500, Dawg Gone It, is wide enough at the tail for internal linkages. There is a construction thread on the NMPRA forum on that model.

The external linkage did not seem to slow the model down any this weekend.

The Mad Dog was one of the faster models at the Goddard race.
Old 09-20-2009, 08:14 PM
  #58  
blindfaithnogod
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Default RE: Mad Dog Thread

it sure was.... if we can just get that pilot to catch up with the plane we'll all be in trouble.

all kidding aside good job this weekend, especially considering your lack of practice. Did you make it back home already?

-Paul F.
Old 09-21-2009, 10:35 AM
  #59  
fizzwater2
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Default RE: Mad Dog Thread

I hear Scott's coming up to Hillsdale KS for the 424 race this saturday. Come and race with us, see that Mad Dog fly in person!

Old 09-21-2009, 02:38 PM
  #60  
sahartman21
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Default RE: Mad Dog Thread

I made it home today without issue.

I'm planning to make it to Hillsdale KS for their race.
Old 09-21-2009, 02:51 PM
  #61  
fizzwater2
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Default RE: Mad Dog Thread

did you get a chance to put in any more prop testing on your Q40 sport Stegall Stinger? That's a nice looking plane. I hope to get some more flights on my Nemesis, but it won't be for a while, have to make that trip to Venezuela first.

Old 09-21-2009, 07:54 PM
  #62  
sahartman21
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Default RE: Mad Dog Thread

I haven't tested any more props on the Stinger since this weekend. I've added comments on the Stinger thread.
Old 09-22-2009, 08:10 AM
  #63  
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Default RE: Mad Dog Thread

Scott,

how are you liking the MN48 servos? So far the ones that I had on the viper were no centering all that well. Are yours doing any better.

Doug
Old 09-27-2009, 04:14 PM
  #64  
sahartman21
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Default RE: Mad Dog Thread

My MN48 center fine. I went to the JR Sport MN48 because they center better than some of the other inexpensive servos.

Others have warned me that they don't hold up very well. I don't have very much time on them to indicate a trend.
Old 09-27-2009, 06:56 PM
  #65  
DHULEN
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Default RE: Mad Dog Thread

I have seen this airplane fly for the last 2 weekend races (Wichita and Barnstormers), and this plane looks to fly great, and is definitely fast. Nice job Scott!!

Duane
V12
Old 09-28-2009, 08:38 PM
  #66  
s-10promod
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Default RE: Mad Dog Thread

Scott, That's one fast 424 you have got on your hands. I'm still willing to trade engines if you don't think it's fast enough! Just kidding, I wouldn't change a thing on that one.
See you in Lee's Summit in a couple weeks,
Eddie
Old 10-27-2009, 07:33 AM
  #67  
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Default RE: Mad Dog Thread

scott, how about the cg, my mad dog needs lead in the tail . The nose is quite long compared to my raptor.
Old 10-27-2009, 07:43 AM
  #68  
sahartman21
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Default RE: Mad Dog Thread

I balance mine at about 2 3/4" back from the leading edge. Mine used a C.G. tank and the model didn't need any lead to balance.

My Dawg Gone It needed a little lead so add some if needed.
Old 05-17-2010, 04:06 PM
  #69  
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Default RE: Mad Dog Thread

Ik had to change the dihadral of the stab, i had to increase the angle for 3 mm at the backsite.
Is this normal?
Old 05-17-2010, 07:58 PM
  #70  
sahartman21
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Default RE: Mad Dog Thread

I built mine with the angle on the plans.

As long as the incidence is zero-zero on the wing and stabilizer there shouldn't be an issue.

Good luck on your model!
Old 05-18-2010, 03:40 PM
  #71  
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Default RE: Mad Dog Thread

Ok thanks, I have it finished and flown already, we fly here slow quicky with standart engine/muffler combination ( 12.300 rpm 80DB(A) at 7 mtr). Speed is about 120 mph. Just enough to have a lot of race fun.
Old 06-17-2010, 08:25 AM
  #72  
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Default RE: Mad Dog Thread

anyone have a link for the Dawg Gone It build thread?

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