SM F18 vrs TAM F18  
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SM F18 vrs TAM F18 - 11/2/2005 4:16:12 PM   
JustJets


 

Posts: 69
Joined: 9/10/2003
From: Las Vegas, NV, USA
Status: offline 		CURRENTLY WORKING ON BOTH KITS. I WILL POST MY BUILDING NOTES AND OPTIONS. ANY ONE INTERESTED?

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< Message edited by JustJets -- 11/2/2005 4:59:15 PM >
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RE: SM F18 vrs TAM F18 - 11/2/2005 5:13:24 PM   
JustJets


 

Posts: 69
Joined: 9/10/2003
From: Las Vegas, NV, USA
Status: offline 		TAMs F18
Will start with tail end of the kits just to give brief over view, TAMs kit has the system here, any one looking at his web site will see it for what it is. Very Very strong and almost zero slop or end play. Servo box is made up of 1/4 ply which is mounted at mid ship supported by aft main wing former. Will use the JR DS8611 servos and included hardware. No changes needed here

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< Message edited by JustJets -- 11/3/2005 8:02:13 AM >

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RE: SM F18 vrs TAM F18 - 11/2/2005 5:36:28 PM   
SJN



Posts: 4440
Joined: 9/28/2002
From: Copenhagen, DENMARK
Status: offline 		Looks alot like the jetlegent stab. mount.
http://www.jetlegend.com/show.php?sn=18

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Sonnich Johannesen

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RE: SM F18 vrs TAM F18 - 11/2/2005 5:45:12 PM   
john agnew


 

Posts: 1721
Joined: 1/29/2004
From: glasgowScotland, UNITED KINGDOM
Status: offline 		Sonnich

It looks like the Jetlegend elevator bearing because Jetlegend makes the F18 for Tam And his new F16

John

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RE: SM F18 vrs TAM F18 - 11/2/2005 5:50:21 PM   
YellowAircraft



Posts: 3187
Joined: 1/5/2002
From: San Diego, CA, USA
Status: offline 		Justjets,

Keep up the good work. It's about time someone did this thread. I know many people have been waiting for a no-bones, no-spin, no-BS comparison. This should answer a lot of questions for a lot of potential customers----assuming you're not an undercover shill for one of these outfits, that is......

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RE: SM F18 vrs TAM F18 - 11/2/2005 6:08:40 PM   
JustJets


 

Posts: 69
Joined: 9/10/2003
From: Las Vegas, NV, USA
Status: offline 		Hi Shaun
Paid full price for both kits. I have no affiliation with Ether Company, nor do I have the time to push any products. I am a full time military aviator stationed in Germany. These are my kits and my personal opinions only. I do not whish to insult or offend any one who may operate or own either one of these kits. If I seem hard in one or more areas you can bet it will be safety related areas. Please feel free to correct me if I go astray.

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RE: SM F18 vrs TAM F18 - 11/2/2005 6:52:30 PM   
JustJets


 

Posts: 69
Joined: 9/10/2003
From: Las Vegas, NV, USA
Status: offline 		SM F18
Was looking at few things that were of concern for me here, 1st seems to be lot of play in this area. Elevator system has radial and end play, almost 3/8 inch of up/down play at tip. End play is not as bad, but I needed to be shimed in place with three nylon washers which will make assembly at flying field impractical. I have used the best hardware available on the market and can’t seem to reduce slop in this area. 2nd, I did notice that the servo mount was flexing when the elevator was in motion. This area could be reinforced with additional wood. However most of my end play is coming from the elevator pivot rod which has a flat machined into its surface. There is approximately 35% material removed from this rod which seems to be the problem area as far as this slop is concerned. I will include a few photos’ that will address my concerns in this area. Not sure that anything will help this type of a set up, or if it will work well or not. My guess is that it will operate fine if kept clean and well lubed at ALL COST. But this area will definitely be a preflight check item. If all else goes well with the kit I may try something different on this control surface.

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< Message edited by JustJets -- 11/7/2005 6:13:43 PM >

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RE: SM F18 vrs TAM F18 - 11/2/2005 7:25:49 PM   
YellowAircraft



Posts: 3187
Joined: 1/5/2002
From: San Diego, CA, USA
Status: offline
quote:

ORIGINAL: JustJets

Hi Shaun
Paid full price for both kits. I have no affiliation with Ether Company, nor do I have the time to push any products. I am a full time military aviator stationed in Germany. These are my kits and my personal opinions only. I do not whish to insult or offend any one who may operate or own either one of these kits. If I seem hard in one or more areas you can bet it will be safety related areas. Please feel free to correct me if I go astray.



Hey,

Awesome. Now I'm REALLY interested in this thread. That seems like a very strange way to build that stab shaft. Why do you suppose the flat spot is so huge? Also, before you get into the particulars with regard to construction--what was your overall impression of the external airframe? Which one had the better layup, better detail, more tidy, etc.? What do the bare airframes weigh? Thanks!

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RE: SM F18 vrs TAM F18 - 11/2/2005 8:06:26 PM   
JustJets


 

Posts: 69
Joined: 9/10/2003
From: Las Vegas, NV, USA
Status: offline 		Hi Shaun
Not sure what SM was thinking on this change. I have two SM F15’s and this modification is absent, (TG). They have eliminated any potential slippage that may have occurred but also have gained some slop in this area which was not there on previous elevator systems. We will have to see how well this holds up under regular use. Keep in mind that the outer bushing has full contact with the elevator shaft, it is the inner bushing were the play appears to be generated from. It is only a few thousands of an inch but that is magnified quite a bit out at the tip of each elevator. As far as the kit goes I have taken 127 photos of these kits so far and will be covering the fuselage and it's construction in detail as I move along. I think in the end you will see it really depends on your expectations of each kit as to which kit one might prefer. Please feel free to call for a more direct answer.

Phil

< Message edited by JustJets -- 11/2/2005 8:39:28 PM >

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RE: SM F18 vrs TAM F18 - 11/2/2005 8:18:53 PM   
Aero65



Posts: 633
Joined: 5/24/2002
From: Honolulu, HI, USA
Status: offline 		Phil

Keep up the good work. I will pass your suggestions on to Skymaster for improvements; I'd like to thank you in advance for any constructive criticism that you might offer.

If you have any questions please feel free to ask.

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Hawaii Jets / Airpac Models Rep

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RE: SM F18 vrs TAM F18 - 11/3/2005 12:45:18 AM   
TED ANTON



Posts: 124
Joined: 12/13/2004
From: Toronto, ON, CANADA
Status: offline 		Hi Phil


I have a SM F5 and I noticed that when I removed the servo grommets the stab servo could be further tightened to eliminate
any servo movement.
The great thing about turbines is the almost zero vibration compared to ducted fans.

I was at a recent jet meet and compared an Avonds F15 to a Yellow F15 parked right next to each other, I have seen each kit many times( and built 2 F15's) but when their right next to each other you can really notice the similarities and differences.

Keep your post going, it's very interesting so far.


Thanks

Ted

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RE: SM F18 vrs TAM F18 - 11/3/2005 1:37:19 AM   
David Searles


 

Posts: 731
Joined: 4/17/2002
From: SANTA ANA, CA, USA
Status: offline 		Regarding the flex in the stab servo mounting plate: I had the same flex, so glued right angle ply gussests on each side of the servo, front/rear, top/bottom that took care of the flexing but still had the same slop in the mechanism you're reporting. Though Skymaster does not reccomend it, I decided to static balance the stabs in hopes of reducing some of the slop in the air. Seems to work.

DS


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RE: SM F18 vrs TAM F18 - 11/3/2005 1:41:32 AM   
Topgun2mo



Posts: 1046
Joined: 1/10/2002
From: Slidell, LA, USA
Status: offline 		Static balancing could actually make the stab prone to flutter. Everything I have read says only balance to reduce servo load on the ground and alway end up somewhat tail heavy on the stab.

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RE: SM F18 vrs TAM F18 - 11/3/2005 8:43:58 AM   
YellowAircraft



Posts: 3187
Joined: 1/5/2002
From: San Diego, CA, USA
Status: offline 		Topgun,

You're right. Messing with the dynamic balance is asking for trouble, even if just a little. I won't pretend to understand all the science, but when I had it explained to me by a PhD in AE, it made perfect sense (not to balance the full-flying stab an an F-18), but when it's explained by laymen, it comes out sounding like "...because I heard somewhere that you should..."

Hopefully, the people doing this have servos that are strong enough for it not to make too much of a difference.

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