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Rebuilding my Dragonslayer 7 after a hard hit to improve it


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#1 Joexemm

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Posted 20 July 2016 - 01:19 PM

My original design had 2 main rails of .047 that were separated by a piece of .047 at front and rear and the tripods were .047... Lots of .047... It was okay had a twitchy tendency but I have a young finger and can react to it and keep it under wraps. 895afdfadaa0245179a37551aebc5fa4.jpg

This is when it was new and shiny. It's less pretty now.


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#2 Joexemm

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Posted 20 July 2016 - 01:56 PM

looks like the tripods are actually .062.... 

this was taken at the fall brawl last year i cant remember breakfast


Joseph Emm

 

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#3 Pablo

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Posted 20 July 2016 - 02:52 PM

I'll take a wild stab at it :crazy:

Your twin .047 main rails are giving the chassis some nice easy flex, but the bigger wire (.063) tripod rails are using energy in trying to not allow them to flex.

In other words, start big and stiff on your inner rails, and go smaller with more flex as you go outward, as opposed to vice-a-versa.

 

If I'm right, a change to .047 on the tripod rails will calm it down. Try temporarily unsoldering the tripod rails where they connect in front, then test.

If that calms it down, I may be right. If not, just solder it back on.

 

I've built chassis that are too stiff and they can be really twitchy, evil and unpredictable  :o 


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#4 Pablo

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Posted 20 July 2016 - 02:53 PM

PS. What is the WB and GL ?


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#5 Joexemm

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Posted 20 July 2016 - 03:30 PM

The Guide lead is what ever the nose is built to and it is a 4" wb


Joseph Emm

 

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#6 Pablo

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Posted 20 July 2016 - 03:35 PM

OK no problem there. Other than me being dumb to ask about the GL :laugh2:


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#7 Joexemm

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Posted 20 July 2016 - 03:51 PM

All good Im not good enough yet to be playing with all that unless instructed by the chassis gods!


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Joseph Emm

 

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C.O.W. retro chassis Everyone that runs one knows Checkers or Wreckers

 

 


#8 Pablo

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Posted 20 July 2016 - 04:38 PM

Joseph, take a look at Jim F's Dragonslayer here - looks a lot like yours, except all rails are .047:

 

http://slotblog.net/...e-track-test-2/


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#9 Joexemm

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Posted 20 July 2016 - 04:53 PM

Hmmmmmm perhaps I looked at that way back when. I honestly don't remember. HOWEVER I'm just going to go with that build and do it clean this time around. I have gotten some more practice since then. Not a lot but some.


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Joseph Emm

 

"Success is the best Revenge".... - someone smart.

 

C.O.W. retro chassis Everyone that runs one knows Checkers or Wreckers

 

 


#10 Joexemm

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Posted 20 July 2016 - 04:55 PM

bad9005bf0c737450b8d37b7ce258ee7.jpg96ca2307bb43c5f9e04abd0d5b927432.jpg

I was directed on this stock car build by a chassis God. Came out pretty hope it runs as good as it looks.

I'm gonna work on this when I get home from work we shall see what come off the jig in a few hours!


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Joseph Emm

 

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#11 John Streisguth

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Posted 20 July 2016 - 05:13 PM

My suggestion would be to just drop 047 wire between the main rails, as far forward as the front of the motor.  There's probably too much flex going on in the back. It's simple to do. If that doesn't work, try a full third 047 rail

Also, it looks like you used two pieces of wire for the tripod rails instead of one.  You may not be transfering the force properly since it will actually be through the brass plate. I would replace those wires with single pieces bent at the correct angle.

And reinforce the guide tongue...a brass one will get bent pretty easily


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#12 Joexemm

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Posted 20 July 2016 - 05:34 PM

Yes it did get bent in its venture lol it will be reinforced this time around and yes I learned to bend the rails far better so that will be one piece. Seems like I should just freshen what I already have


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Joseph Emm

 

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#13 Joexemm

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Posted 20 July 2016 - 07:55 PM

47b67bdf173676b9909a51950266ec9e.jpg
Cleaned and flat again ready to be reassembled


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Joseph Emm

 

"Success is the best Revenge".... - someone smart.

 

C.O.W. retro chassis Everyone that runs one knows Checkers or Wreckers

 

 


#14 Josh Crutchfield

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Posted 20 July 2016 - 09:11 PM

Joseph,
I'd suggest either twelve rails of .039 soldered front to back or twenty rails of .032 with a piece of .039 soldered to the top of each side.
Josh
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#15 Tom Eatherly

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Posted 20 July 2016 - 10:55 PM

Josh,

I have one of your older, and I mean, older chassis' I bought four years ago from Bryan Warmack. I use it only on BPR's flattrack, and that damn thing still works so good, I ain't EVER getting rid of it.You can see it on our race reports, as I'm not very good at posting pics. Josh, this would be a Can-Am car.


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#16 Joexemm

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Posted 21 July 2016 - 06:51 AM

Interesting josh I'll have to try one of those

I did choose to go down the road I was already on but with all 047 and properly bent tripod rails. I'm going to be on kings and hill climbs mainly with this car and I know it ran well on an engleman even in its state hahaha


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"Success is the best Revenge".... - someone smart.

 

C.O.W. retro chassis Everyone that runs one knows Checkers or Wreckers

 

 


#17 Joexemm

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Posted 21 July 2016 - 09:35 PM

I 6c1f26c2a87bb2f258edd288466f0543.jpg
89b577dad579643ce8e52e4451a65ad6.jpg

And that's a wrap till I wreck it again! Thanks for all the input and I will be trying some of the other builds in the future for sure. Your wisdom has not fallen on deaf ears.


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Joseph Emm

 

"Success is the best Revenge".... - someone smart.

 

C.O.W. retro chassis Everyone that runs one knows Checkers or Wreckers

 

 


#18 Samiam

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Posted 21 July 2016 - 10:00 PM

Nice job Joe.

 

You made that chassis great again :good:


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#19 John Streisguth

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Posted 22 July 2016 - 06:00 AM

That's gonna be a real "flexi-flyer"   :)

But easy enough to drop extra 047 rails in if you find this to be the case....


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#20 Pablo

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Posted 22 July 2016 - 06:20 AM

I'm betting that makes a big improvement :good:  Looks SANO, too !


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#21 Joexemm

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Posted 22 July 2016 - 06:28 AM

Well having learned on flexi cars and euros and open 12's I'm not afraid of snappy high energy cars. So that's probably why it's okay for me


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C.O.W. retro chassis Everyone that runs one knows Checkers or Wreckers

 

 


#22 John Streisguth

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Posted 22 July 2016 - 02:36 PM

That's the great thing about retro chassis, you can build them to your taste


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#23 Joexemm

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Posted 01 August 2016 - 08:59 AM

Back to the Drawing board. I need a stiffer car i do believe! my car was exciting to drive none the less. On the HVR track seems to me that i was lacking rear weight in everything i put on the track only i came to this realization in the 5th or 6th heat of the E-main. i started piling it on and the thing got drive-able. a stiffer car i think would accomplish the same task. also the motor was wicked fast with no brake so having to let up in the middle of the straight for a turn is no way to race. Learned a lot this weekend tho. ill be back and i wont be in the shape i was in.

 

I should mention all my cars were Nosing out before the apex of the turn. So basically on deceleration when the weight was moving forward. I had the guide set right (i annoyed everyone to tell me that).  


Joseph Emm

 

"Success is the best Revenge".... - someone smart.

 

C.O.W. retro chassis Everyone that runs one knows Checkers or Wreckers

 

 


#24 John Streisguth

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Posted 01 August 2016 - 09:19 AM

Drop in a second 047 tripod rail and a half rail of 047 between the two existing ones, and I bet you'll like it.  

 

Sounds like with the amount of flex you had a lot of mechanical bite, and if you were running a kelly retro tire you may have had too much grip. I ended up running JK treated with ghetto hubs to loosen my car up a bit, and soft wonders on my stock car.  A tire with more bite was a half tenth quicker, but a little less bite made the car much more "raceable".  


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#25 Joexemm

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Posted 01 August 2016 - 11:17 AM

Yeah i had those srt retros that they had there and if it isn't too bent ill just drop in those rails and give it a go. Next race is at that little grandstand track that i think i can test on our hurricane for. the track looks like it has a gentle bank with some technical donut stuff which is a matter of driving. so i should be better prepared. Also i hear they are gonna do a sunday event so i may try and make that


Joseph Emm

 

"Success is the best Revenge".... - someone smart.

 

C.O.W. retro chassis Everyone that runs one knows Checkers or Wreckers

 

 


#26 John Streisguth

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Posted 01 August 2016 - 12:03 PM

The bank is actually a pretty tight radius but Can-Ams don;t have any issues there.  Stock cars are another story  LOL.  The key to a fast lap is being able to punch the donut on all but the inside lanes, and then hit the kink onto the straight with a minimum of loss of momentum, which is a timing thing.

They will probably be running retro on Sundays from this point on, but they will be better attended the weekends before a Retro East race


"Whatever..."

#27 slotcarone

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Posted 01 August 2016 - 05:29 PM

Joe it sounds like your car was just tight from too much bite/too soft tires. I ran HVR wonder right out of the tube and still felt it was too tight the last few heats.


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#28 Josh Crutchfield

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Posted 01 August 2016 - 06:09 PM

I would add the .047 rails on the outer angle rails. I would also solder all of the rails solid up to the leading edge of the pan stops and add an axle tube.
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