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PST F-84G Build Thread

Old 05-18-2010, 03:41 AM
  #426  
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Default RE: PST F-84G Build Thread


ORIGINAL: chrigui

i put some modify on my plane like Oliver indications.

i moved down the front gear system add 1cm lenght nose
i reduced the main diameter wheels from 115mm to 105mm
i modified original brake and cleaned it from grease ..
i removed 200g of ballast in the nose

then i will try to take off with 50% main tank full (like sm f-86 1/5 cg problem)

many thx for indication to Oliver and Chris

Hi Oliver

yesterday i tryed new modification in my f-84 to change the Ground AoA

50% less take off run lenght..... and not fast like previous flight..
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Old 05-30-2010, 04:50 PM
  #427  
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Default RE: PST F-84G Build Thread

hi chris.
got her back from spray shop now and doing a gear install this week, dave wilshire comming up in two weeks to maiden her so ill have lots of pics here soon, i decided to do her in the thunderbird scheme so if all goes well ill post a video of maiden

a little teaser for just now.....








and finally avionics install.....should be ok



wonder if the turbine will run on this?



well lets not take life so serious

graham
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Old 06-03-2010, 06:18 PM
  #428  
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Default RE: PST F-84G Build Thread

Graham,

She looks great! Install looks good just make sure you add the turbine oil to the Gin! Let us know how she flies! The owner is very close to flying the one I built, so we should have a report on that one as well!

Chris
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Old 06-04-2010, 03:38 AM
  #429  
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Default RE: PST F-84G Build Thread

wonderful...!!
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Old 06-05-2010, 04:00 AM
  #430  
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Default RE: PST F-84G Build Thread

getting close now chris, only5 days til dave gets here still got the wing retracts and doors to do.....aint looking forward to this ive been putting this job off for ages..!

ill either be smiling or crying this time next week..!!!

graham
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Old 06-10-2010, 01:35 AM
  #431  
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Default RE: PST F-84G Build Thread

adding some rivets

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Old 06-14-2010, 03:40 AM
  #432  
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Default RE: PST F-84G Build Thread

very nice bud....wish i added some more now, my one out this weekend for maiden but dave wilshire was not happy with the condition of our local field and felt that there was too much risk of damage on landing due to bumps etc he already ripped his u/c out of a jet of his earlier due to gear getting ripped off hitting a bump and hole etc.....fired turbine up , model all checked so ready for tarmac runway next month...

i was assured by pornchai at pst standard gear is working fine so i have fitted the gear and all seems ok min pressure on ground is 80 psi and at 140psi there seems no issues but time will tell in the air.........one small but major issue was the nose leg jamming on the up/down lock so i will need th take out and do some reworking on mechanisim dunno what the problem is im wondering if it could be the silicon grease i put on for lubrication? it just needs a slight touch and it works fine in both directions weird!

get building bud and keep the pics comming

graham
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Old 06-14-2010, 03:44 AM
  #433  
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Default RE: PST F-84G Build Thread

the nose gear work perfectly..i moved it down the wood plate to gain a few millimeters to increase the AOA

to chek if the main gear work perfectly with psi indicate you can try in flight with air flow ...
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Old 06-14-2010, 05:07 PM
  #434  
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Default RE: PST F-84G Build Thread

i increased aoa by putting a .15 mm shim in main gear elbow stop, this reduced the length of main gear by about 5 mm, every little helps! also i filed away a little of the noseleg elbow stop JUST A LITTLE... WHICH INCREASES the length by a few mm this was recomended by kryuith of pst when i was in thailand, although the main gear mods was my idea, i have no idea of pst opinion regrding this.... flying next month so will post maiden here


graham

ps

trials running the turbine on sloe gin have been posponed......i drank it all last night..!!!!


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Old 06-14-2010, 06:03 PM
  #435  
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Default RE: PST F-84G Build Thread

Graham,

I too had issues with the NLG retracting and extending. I had to rework the cam tracks with a needle file to get things to operate smoothly. If you look closely, the locks are a bit aggressive. When the gear is up you can see that when the cylinder starts to unlock the gear, it actually pulls it harder into the lock, the weight of the strut makes it worse so that little tap is enough to remove the load from the lock and allows the gear to extend. The same can be said for the down position, if the nose steering cables are excessively tight, the gear will bind, a gentle push from behind the gear, frees the load and the gear retracts. It took some time but is worth not having a nose up landing to scoop all that dirt up and into the engine!!!! The pic show an exaggerated drawing of the track untouched (red) and reworked (blue). Grab some needle files and Gin and get to work!!!!

Also, look back a few pages, you will see where I redid the spring on the drag brace, it is necessary to make it work properly EVERYTIME. If you still have the little sheetmetal piece bolted to back of the gear you can remove it and can it, not needed when the spring geometry is redone.

Let me know if you have questions, always glad to help.

Chris

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Old 06-14-2010, 06:12 PM
  #436  
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Default RE: PST F-84G Build Thread

Check out post 336 and 340 for NLG spring mod.

Chris
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Old 06-15-2010, 05:47 PM
  #437  
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Default RE: PST F-84G Build Thread

hey chris

OK chris have done the mods as shown gear now retracting fine,have a few more pics now,getting close to maiden everything seems to check out ok

dave wilshire comming up to aberdeen in two weeks to have the missfortune to maiden her !!!!

graham











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Old 08-05-2010, 07:13 AM
  #438  
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Default RE: PST F-84G Build Thread

I would like to thank Stratotanker ( Chris Reitter) for his wonderful and fantastic work, creating the gismo for the main gear doors, the rails for the wheel well and more important of all the paint maskings from a 1/48 plastic model to the actual 1/5.6 size of the scale kit. The maskings are as follow bars and stripes, complete tail surfaces, canopy ring, the nose colors and tip tanks. This model would be at Florida Jets and Top Gun 2011. Again thanks to Chris for all the great job.

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Old 08-05-2010, 09:26 AM
  #439  
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Default RE: PST F-84G Build Thread

wonderful!!!!
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Old 08-05-2010, 01:38 PM
  #440  
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Default RE: PST F-84G Build Thread

Hello:

She is very pretty, congratulations.

Best regards from Spain.

Carlos.
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Old 08-25-2010, 02:13 AM
  #441  
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Default RE: PST F-84G Build Thread

hi chris
just wondering if your f84 has flown yet and if there is any videos yet, mine is all ready to rock when dave wilshire gets a chance to come up to aberdeen to maiden for me....weather has been bad here for past few weeks hence the delay, have now got my ASM LANCASTER BOMBER as my next project 120" wing span and ill be putting 4 x os70 four strokes in her...should sound nice and be impressive in the air
still not a lot of videos of 84g on youtube yet .....i wonder if like me the owners just like looking thier models and are scared / reluctant to fly them ?

graham
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Old 08-25-2010, 06:39 AM
  #442  
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Default RE: PST F-84G Build Thread

Hi Graham

I have had the F84 that Chris was working on for some time now but completion of other projects have prevented me from doing the final bits and pieces. There were a few things that we felt still needed to be worked out. We have a multistage fuel system that I wasn't happy with and have since revised it. The nose retract unit needed some fine tuning, engine has been installed and the sliding canopy needed a little fiddling. We want to make sure that the airframe is operating 100% before flight tests. Anyway, I will have her maidened by mid September - if not sooner!

Cheers
D.Wichmann
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Old 08-25-2010, 12:56 PM
  #443  
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Default RE: PST F-84G Build Thread

thanks for the update dean am sure there are many guys on here looking forward to seeing your baby fly,,,,,,

graham
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Old 10-08-2010, 12:46 PM
  #444  
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Default RE: PST F-84G Build Thread

hi dave .....into october now..!!!!! your worse than me....still not got my one in the air yet[&o]

graham
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Old 10-08-2010, 03:09 PM
  #445  
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Default RE: PST F-84G Build Thread

Hi Graham

The F84 was flown twice September 16. All checks went well and a ground run was done. We found a few interesting things. Having the cockpit deck in place reduced the rear fuse temperature by 20 F. The rear fuse to front attachment area was warm to touch requiring the use of heat protection. Oliver noted this in his earlier review. Some use of ceramic paint, aluminum foil and ceramic cloth is needed.

The F84 is a joy to fly and very stable in the air. I had a slight problem with my gear sequence but otherwise the Titan / airframe combo is very well matched. For landing I mixed the speedbrake with full flaps and this works really well; allowing you to pin point the landing zone very easily. I am hoping to get a few more flights in before the snow falls then its just some more fine tuning and scaling out in preparation for the upcoming World Masters.

Cheers
Dean W.
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Old 10-08-2010, 09:11 PM
  #446  
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Default RE: PST F-84G Build Thread

How about some pictures or better yet some video. I would like to see that bird fly
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Old 10-10-2010, 07:04 AM
  #447  
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Default RE: PST F-84G Build Thread

mine in painting process

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Old 10-12-2010, 06:48 AM
  #448  
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Default RE: PST F-84G Build Thread

wing tank..

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Old 10-14-2010, 07:33 AM
  #449  
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Default RE: PST F-84G Build Thread

tail

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Old 10-16-2010, 03:19 PM
  #450  
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