RE: f22 raptor-rc work on progress!  
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RE: f22 raptor-rc work on progress! - 1/12/2008 1:34:58 PM   
hpghost



Posts: 484
Joined: 12/8/2004
From: dubai, UNITED ARAB EMIRATES
Status: offline 		after 6hrs machining, here is the first nozzle (1hr setup, the machine does the rest!)

you can see the block before and after.

now it is time for me to make the rudder, stab and wing molds as I just received resin and plugs are now ready...AT LAST SOME PROGRESS!

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RE: f22 raptor-rc work on progress! - 1/13/2008 2:03:09 PM   
hpghost



Posts: 484
Joined: 12/8/2004
From: dubai, UNITED ARAB EMIRATES
Status: offline 		now there is the bottom plate to complete the nozzle...need to find some very flat head screws...

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< Message edited by hpghost -- 1/13/2008 2:04:40 PM >

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RE: f22 raptor-rc work on progress! - 1/15/2008 4:42:12 PM   
acepilot121


 

Posts: 17
Joined: 9/18/2005
From: Egg Harbor Township, NJ, USA
Status: offline 		thats looking awsome

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RE: f22 raptor-rc work on progress! - 1/15/2008 6:54:37 PM   
bruce88123


 

Posts: 10249
Joined: 11/26/2004
From: Memphis, TN, USA
Status: offline 		It does look nice.

B

TW - we may not comment often but we're watching.

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RE: f22 raptor-rc work on progress! - 1/15/2008 10:10:35 PM   
Mods-R-Me



Posts: 798
Joined: 6/13/2005
From: Antelope Valley, CA, USA
Status: offline
quote:

ORIGINAL: bruce88123

TW - we may not comment often but we're watching.


copy that


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RE: f22 raptor-rc work on progress! - 1/16/2008 3:54:58 PM   
hpghost



Posts: 484
Joined: 12/8/2004
From: dubai, UNITED ARAB EMIRATES
Status: offline 		last week end, I tried to mold the last rudder half...I used polyester as i wanted to see how this works (in order to save some $ on my temporary molds!).

this is the last time I use the polyester for that! the mold couldn t release, the gelcoat was not good and the plug got damaged.
not even speaking about the smell of polyester which I hate and the dosing which is not as easy as epoxies...

will keep it to mold some epoxy parts only....

now I need to mill a new half rudder and do again primer on it...damn...lost 2 days work!

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< Message edited by hpghost -- 1/16/2008 3:56:30 PM >

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RE: f22 raptor-rc work on progress! - 1/16/2008 4:30:41 PM   
bruce88123


 

Posts: 10249
Joined: 11/26/2004
From: Memphis, TN, USA
Status: offline 		I can see the problem. You didn't use a big enough hammer.

Rats, I hate it when that happens.

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RE: f22 raptor-rc work on progress! - 1/16/2008 4:37:23 PM   
hpghost



Posts: 484
Joined: 12/8/2004
From: dubai, UNITED ARAB EMIRATES
Status: offline 		next time I use the jig saw!!!


Btw, hummer is used to take back the alum rods (I do recycling )

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RE: f22 raptor-rc work on progress! - 1/16/2008 6:20:34 PM   
TeamSeacats



Posts: 143
Joined: 3/9/2007
From: Greenville, SC, USA
Status: offline 		I don't think your problem was the polyester but the fact that your paint was not compatible with it - looks like they reacted and/or you didn't get a good release layer of wax. Try using wax with a PVA film to act as a barrier between the part and the mold....separation is guaranteed but a shiny finish is difficult with the PVA.

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RE: f22 raptor-rc work on progress! - 1/16/2008 6:52:12 PM   
hpghost



Posts: 484
Joined: 12/8/2004
From: dubai, UNITED ARAB EMIRATES
Status: offline 		in fact there is two explanations from y side:
- resin didn t worked with my wax.
- wax work better with epoxy.

I already did many molds with Expoy gelcoat and resin. never such issue. so I beleive it is not problem between paint and wax as this was already like that before...don t you think so?

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RE: f22 raptor-rc work on progress! - 1/17/2008 4:05:47 AM   
TeamSeacats



Posts: 143
Joined: 3/9/2007
From: Greenville, SC, USA
Status: offline
quote:

ORIGINAL: hpghost

in fact there is two explanations from y side:
- resin didn t worked with my wax.
- wax work better with epoxy.

I already did many molds with Expoy gelcoat and resin. never such issue. so I beleive it is not problem between paint and wax as this was already like that before...don t you think so?


I can't say for sure - I know that I have not had a problem with cheap "spray can" paints and polyester resin if I use PVA between. For my plugs, I paint with spray can enamel and then put a clear coat on it. The clear coat buffs to a great shine but is not terribly durable. Epoxy is certainly less reactive than polyester resins though....stick with what you know works!

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RE: f22 raptor-rc work on progress! - 1/17/2008 10:20:27 AM   
wings_of_fire


 

Posts: 103
Joined: 11/7/2007
From: Pune, , INDIA
Status: offline 		wow!....good to see u back in overdrive hpghost!.. good going ..keep it up.

what material is the metal plate u r using as the bottom plate for the nozzle ? I am concerned about the exaust gas temperature...& the aluminium nozzle behind the plate.

< Message edited by wings_of_fire -- 1/17/2008 10:21:45 AM >

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RE: f22 raptor-rc work on progress! - 1/17/2008 12:20:26 PM   
hpghost



Posts: 484
Joined: 12/8/2004
From: dubai, UNITED ARAB EMIRATES
Status: offline 		metal plate is 0.5mm Stainless steel

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RE: f22 raptor-rc work on progress! - 1/17/2008 2:26:27 PM   
bruce88123


 

Posts: 10249
Joined: 11/26/2004
From: Memphis, TN, USA
Status: offline
quote:

ORIGINAL: hpghost

metal plate is 0.5mm Stainless steel

Ouch! Bet that took a toll on the cutter.

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RE: f22 raptor-rc work on progress! - 1/17/2008 2:46:00 PM   
hpghost



Posts: 484
Joined: 12/8/2004
From: dubai, UNITED ARAB EMIRATES
Status: offline 		I simply spayed tons of WD40 while cutting and reduced cutter to lowest RPM... I would not say it is good but as you can see it works...

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RE: f22 raptor-rc work on progress! - 1/20/2008 10:13:40 AM