RE: Jamara Spitfire60 ARTF  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> Radios, Batteries, Clubhouse and more >> User Product Reviews >> RE: Jamara Spitfire60 ARTF
Page: <<   < prev  1 2 [3] 4 5 6 7 8   next >   >>  

Login
Message << Older Topic   Newer Topic >>
RE: Jamara Spitfire60 ARTF - 12/22/2003 10:26:11 AM   
Mac-



Posts: 759
Joined: 7/5/2002
From: private, AE, UNITED KINGDOM
Status: offline 		I have opted to remove the balsa at the rear of the tail slot and fit a fully assembled tail/elevator. When this and the balsa plug are eventually glued into position I will add a short length of 14 guage wire at the rear for reinforcement!

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize

(in reply to Mac-)
       Post #: 51

RE: Jamara Spitfire60 ARTF - 12/22/2003 1:21:45 PM   
Mac-



Posts: 759
Joined: 7/5/2002
From: private, AE, UNITED KINGDOM
Status: offline 		A bag contains the control rods....2 elevator, 2 rudder, 2 aileron and throttle wire/ outer guide tube and 2 lengths of dowel. The threaded ends of the wire connects to the rudder/elevator and aileron horns.

1) Drill the dowels at each end with a 2mm drill.

2) Bend ends to form to 90 degrees.

3) CA ends into dowels and bind/glue with thread.

4) Cover with supplied heat shrinkable tube.

Note: You may need to shorten the dowels to suit your installation requirements before drilling holes at both ends!

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


< Message edited by Macx -- 12/22/2003 1:23:38 PM >

(in reply to Mac-)
       Post #: 52

RE: Jamara Spitfire60 ARTF - 12/23/2003 10:02:46 AM   
Mac-



Posts: 759
Joined: 7/5/2002
From: private, AE, UNITED KINGDOM
Status: offline 		The wing is fitted for the final alignment of the tail unit prior to gluing the latter into position.

The supplied metal wing bolts whilst being of good quality are not to my personal liking. I much prefer some good quality plastic bolts and fastenings which will shear off in the event of a heavy landing and possibly save the model from unnecessary damage.

This Spit is very much a semi-scale model!

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


< Message edited by Macx -- 12/23/2003 10:07:23 AM >

(in reply to Mac-)
       Post #: 53

RE: Jamara Spitfire60 ARTF - 12/23/2003 12:16:47 PM   
chris-s



Posts: 145
Joined: 1/18/2002
From: Cornwall, UNITED KINGDOM
Status: offline 		I ordered one of these yesterday, arrived this morning Opened up the box to check it out and found the fus was crushed/cracked on one side at the rear of the tank bay

This follows another posting elsewhere on rcu where the guy mentioned that this part of the fus seemed very weak.

You might like to add a bit of glass or something on the inside to strengthen this area.

Chris

(in reply to Mac-)
       Post #: 54

RE: Jamara Spitfire60 ARTF - 12/23/2003 3:08:10 PM   
Mac-



Posts: 759
Joined: 7/5/2002
From: private, AE, UNITED KINGDOM
Status: offline
quote:

ORIGINAL: chris-s

I ordered one of these yesterday, arrived this morning Opened up the box to check it out and found the fus was crushed/cracked on one side at the rear of the tank bay

This follows another posting elsewhere on rcu where the guy mentioned that this part of the fus seemed very weak.

You might like to add a bit of glass or something on the inside to strengthen this area.

Chris



Hi Chris-s

That's excellent service by your supplier, but sad that the fuz. was damaged. Have you contacted the supplier? It was probably damaged in transit. Is there evidence of damage to the box itself to suggest this?
An e to the supplier with an image of the damage will help. You should get a replacement model and the return transit costs fully reimbursed to you!
Could you post an image of the damage here please?

I assume that the weak part of the fuz. that you, and the other guy on rcu refer to, is around the servo bay area? That's because there's not much cross bracing support there.
Before you start beefing up this area with fibreglass trial fit the supplied beech ply servo mount. You will find that this considerably 'stiffens' up and supports this area of the fuz.


And try a piece of 3/16th medium balsa where shown if you want it even firmer.

In the event of future damage you could maybe use the fibreglass repair at that time!

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


< Message edited by Macx -- 12/23/2003 9:29:09 PM >

(in reply to chris-s)
       Post #: 55

RE: Jamara Spitfire60 ARTF - 12/23/2003 3:49:43 PM   
chris-s



Posts: 145
Joined: 1/18/2002
From: Cornwall, UNITED KINGDOM
Status: offline 		Heres the pics, they aren't terribly clear since I had not opened the packing bags. There does not appear to be any sign of damage to the box or it's wrapping, so I would guess it happened prior to being shipped. Anyways, I phoned the guys at sussex models, unfortunately, it was their last one until new stock mid-Jan, they offered me 10% discount on this one as recompense, but I said I'd wait for the new stock, there's plenty to be building in the 'shed' anyhow.

I think, like you say, just a balsa doubler would suffice.

Cheers,

Chris

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize

(in reply to Mac-)
       Post #: 56

RE: Jamara Spitfire60 ARTF - 12/23/2003 4:27:37 PM   
Mac-



Posts: 759
Joined: 7/5/2002
From: private, AE, UNITED KINGDOM
Status: offline
quote:

ORIGINAL: chris-s



........they offered me 10% discount on this one as recompense, but I said I'd wait for the new stock

I think, like you say, just a balsa doubler would suffice.

Cheers,

Chris



Chris,

If they changed that offer to 20% I might be tempted!


It's not too bad but I don't blame you going for a complete replacement!

The outer fuz. damge can easily be remedied by placing a clean cotton cloth over the effected area and applying heat from a covering iron or similar The heat will cause the balsa to lift where its become indented to smooth out with the shrinking Oracover. Just slowly increase the heat until the depressed balsa lifts out!
The inside could then be filled witha little car filler and a small strip of wetted 1/64th beech ply CA'd over it.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


< Message edited by Macx -- 12/23/2003 9:24:36 PM >

(in reply to chris-s)
       Post #: 57

RE: Jamara Spitfire60 ARTF - 12/23/2003 8:34:37 PM   
JoeAirPort



Posts: 7155
Joined: 8/11/2003
From: Milwaukee, WI, USA
Status: online 		This has got to be one of the best step-by-step reviews I've ever seen. Nice pic's. Can you imagine if the plane MFGR's supplied this kind of detail? Of course it would be expensive. I liked seeing how you did the pinning of the CA hinges. Very cool.

Joe

(in reply to Mac-)
       Post #: 58

RE: Jamara Spitfire60 ARTF - 12/23/2003 10:34:08 PM   
Mac-



Posts: 759
Joined: 7/5/2002
From: private, AE, UNITED KINGDOM
Status: offline 		Thanks!

< Message edited by Macx -- 12/23/2003 10:37:48 PM >

(in reply to Mac-)
       Post #: 59

RE: Jamara Spitfire60 ARTF - 12/24/2003 12:19:13 PM   
Mac-



Posts: 759
Joined: 7/5/2002
From: private, AE, UNITED KINGDOM
Status: offline 		The supplied 2-piece engine mount is a hard-nylon type!

I have used these before quite successfully on smaller engines without any problems. But, imo, I doubt that it will be up to the job on the heavier ASP .91 4-stroke that I intend to use. So it will be substituted for a more substantial conventional mount after the Xmas break!

Attachments
Click to see fullsize image.
Click for fullsize

(in reply to Mac-)
       Post #: 60

RE: Jamara Spitfire60 ARTF - 12/24/2003 3:35:14 PM   
Mac-



Posts: 759
Joined: 7/5/2002
From: private, AE, UNITED KINGDOM
Status: offline 		I have received this e today…..

waldopepper2 just sent you a private message at 12/24/2003 2:48:12 PM:

~~~~~~~~~~~~~~
RCU - report Spitfire
~~~~~~~~~~~~~~

Thanks for the very interesting report. Do you eventually know the
empty weight of the ARF-kit, and do you see it as a potential subject for converting to electric power ?

Thanks again and the best wishes,

Sincerely,

Walter (Linz, Austria)


Hi Walter,

My Jamara Spitfire is still under construction but I estimate the total weight to be around 7lbs 6oz (118 ozs or 3345g) with retracts fitted. Converting to electric the 4.8v flight pack would have to remain if flying with more than 10 cells where BEC use would not be advisable!

I would estimate that removing the .91 4/stroke 22 ozs, throttle servo 2 ozs, fuel tank 4 ozs would save approximately 28 ozs or 794g.
A decent brush-less motor and dedicated speed-controller and, say 16 x 2400 SCR cells would weigh about 48 ozs or 1360g….a nett weight increase of approx 20ozs or 567g.
So converting to electric would increase the overall weight of the model from approx.7lbs 6ozs to 8lb 10ozs or 3912g. approx. which seems acceptable.

The wing area is 745 sq.ins producing a wing loading of approx. 26.6ozs per sq/ft which is very respectable!

The model would, imo, need to produce about 70watts+/lb x 8lb 10ozs weight = 604 watts approx. for reasonable flight performance.
So 16 cells = 20v x 30 amps output (est) = 600 watts approx.
2 x 8 cell packs could be charged seperately and wired together in series.

Of course using mini servos (3kg/torque) for ailerons would save additional weight, which could offset the weight of a heavier motor and /or cells!!

Therefore conversion to electric should be feasible!

The above is only my initial approximations and merely intended as a guide.


Hope this helps.

Mac

< Message edited by Macx -- 12/24/2003 6:04:06 PM >

(in reply to Mac-)
       Post #: 61

RE: Jamara Spitfire60 ARTF - 12/26/2003 10:29:31 AM   
Mac-



Posts: 759
Joined: 7/5/2002
From: private, AE, UNITED KINGDOM
Status: offline 		Anyone comtemplating the conversion to electric of this Spitfire or similar size models need not buy expensive large muti-cell configuration packs or expensive chargers!

For initial flight testing the lower cost 6, 7 , or 8 cell packs may be used and merely connected together in series.

For example: 2 x7 ( 8.4v) cell packs may be charged on low cost chargers in the normal way then connected together to make 1 x 14 ( 16.8v) cell pack.

Or 3 x 6 cell (7.2v) buggy packs could be connected together as above and configure to 1 x 18 cell (21.6v) pack.

However only cells that offer a high current discharge capacity should be used such as Sanyo 2400SCRs or similar.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize

(in reply to Mac-)