Depth with the Ferex 4 is relatively easy with about 10% error.
Use a close search on 0 to 100nT to identify peak signal value.
Lift sensor up about a foot and carry out a pass. If the signal peak value has decreased significantly then the anomaly is close to the surface.
If no significant decrease then the signal is deep and the following method will work.
Starting from peak signal with the sensor tip close to the ground slowly move directly out until the signal strength drops to 70% of peak. Mark with a non ferrous marker. Return to centre and move directly out 180 degrees to the first direction. Again mark where signal strength drops to 70% of peak.
The distance between the two non ferrous flags will be depth with about 10% error.
As Junk Collector says quantity is a completely different matter with no real correlation to signal with compass correction magnets and magnetised carbon rods giving strong returns way beyond their actual size.
I get better results in the 1 mtr to 5 mtr depth for ferrous with this device
http://www.schonstedt.com/index.cfm?page=GA-72Cd
Ferex I use for deeper.
Regards
Ross
As I said on the Ebay thread..
The lot also contains a NOS unfitted canopy which the vendor sourced seperate to the original purchase and various other fittings.
Look at it as cockpit starter kit with added value.
Ross
Hi Dave,
Bit more spares included than previous.. the canopy alone is a NOS.
Regards
Ross
Hi Bruce,
More down to the seabed location.
Miss Lollipop had suffered engine fires from flak that would not go out despite triggering the extinguisher and trying to blow them out by diving. She eventually nosed in from 500 ft, 1 mile short of Dover. The crash location was extensively trawled resulting in the fuselage being raised to deck level. All that was left proud were the bomb racks and the waist gun mounts (the strongest structures). The video I have seen shows nets and rope wrapped around the props and engines ripping them from the mounts before the trawl was cast.
The Ju88 and the Do17 are in the close vicinity of the Goodwins. The sand bottom tends to be barren of weed and rocks and hence not many scallops or fish shoals which mean that trawl activity has not impacted on the sites.
Regards
Ross
Cheers Andy,
Glad to see that Bob had decided to go public domain with the 88 video, I’ve been waiting for that for some time.
The Do17 and Ju88 are only a few of the located aircraft he also located the dispersed wreckage of B-17 Miss Lollipop and assisted the RN EOD team in their removal of the waist .50 calibre mgs.
Regards
Ross
Sealand Tower,
For wreckage standing proud of the bottom, in reasonable depth, twin beam side scan.
For buried wrecks, sub bottom profiler, but like ground radar needs serious skill in interpretation.
I believe the first locators were a licenced archeological dive team but have no knowledge of what subsequent teams visited the site in the last 10 years or so.
Dave
I made no comparison with conserved/restored wrecks only gave real example of a similar wreck in local to show possible sea bed condition and in the case ofbthe Ju88 that it is self supporting against quite severe currents.
Andy,
Had crossed my mind for both these wrecks but since deterioration was slow was waiting for other developments and creation of suitable electrolytic resto tank facility.
Love the generalisations that it will be just scrap.
Try looking at some actual pictures from an Aug 1940 wreck in this area before writing off the recovery.
http://forum.keypublishing.co.uk/showthread.php?p=1628420#post1628420
Ross
For the low budget you need to replicate 1940-45 gear rather than buy at the premium price.
Consider an Anson as a project. Early replica blind flying panels were on sale at Cockpitfest for £35 – real ones £50-70. MkII and Mk20/21 were shaped but tracings are out there to allow a bit of tin bashing.
Add the surrounding instrument panels, again from tracings as your skills improve.
Cockpit frame is easily replicated in copper or steel tube with minimal bending and welding skills needed.
The cockpit floor is wood egg box type construction and late version pilot seats are quite easy to replicate with hand tools.
Throttle box for the MkII is flat plate held apart with threaded rods, Mk1 and later Mks are folded tin with only one compex casting that is easy to replicate in hardwood laminates.
Cowl would be the final job and needs a bit of metal bashing skill but is possible.
Most of the sub assembly work can be stored in a shed/spare room with only a workbench/hand tools needed for the bulk.
How about this for a project?
Ross
Olympus,
The horizontal stab mostly, the other bits come from other sources far and wide.
Regards
Ross
#42-30836
B-17F-125-BO
551BS/385BG
2Lt E R Herron crew
Awh..don’t be tight. How about some first names for Jackson such as Richard Brian or something else to narrow it down.
Ross
Hi Ritch,
The SAM Modellers guide to the Meteor has a good isometric of the cockpit structure from the illustrated parts catalog.
No measurements give on this but good enough to visualise the structure.
After that I suggest a trip to DoRIS at RAF Museum, Hendon where they will have a copy of the APs. Identify which pages you want copied and they will do the rest.
Regards
Ross
From the draft RAF Coastal Command Losses Vol 2, 1942-43
25/06/42
311 Sqn
Wellington Ic
Z1090
KX-Q
Sgt V J Zezulka
F/Sgt M Cervinka
Sgt J Holna
Sgt A V Jelinek
Sgt Z Janda
Sgt L Kriz
Op: Bremen, RAF Bircham Newton, Take Off 23:27 hrs
Hit a hut on take off and crashed into Brancaster Bay 23 minutes after take off. The crew abandoned in their dinghy close to shore.
Kev, to meet the numbers Coastal Command supplied Whitley, Hudson and Wellingtons to augment Bomber Command 1000 bomber raids. Donna Hook and Bircham Newton were used as a bombing up base and forward operating point to join up with the raid routes.
Regards
Ross
Just visited the museum today on the way back from a call.
Heaving with people and directed to overflow parking between the Cold War Hall and Hangar 2.
No parking charge today where I ended up, staff effectively used directing traffic to overflow areas.
Well done to the museum for using noggin to get people in and parked rather than maximising on charges.
Ross
OK,
Mk.2E commonly fitted to Meteor.
Fixed thigh guards Mk.1E modified by application of conversion set ..although I’ve seen some with the thigh guards also removed.
Mk.2H commonly fitter to Hunter
Basically a Mk.2E seat with headrest further forward. Fixed thigh guards. Cord leg restraint by modification.
Both seat types fitted with Type J PSP, Mk.8 (A for 2E) or Mk.13 Parachute and ZF harness.
Regards
Ross