LocostUSA.com

Learning how to build Lotus Seven replicas...together!
It is currently July 15, 2018, 6:58 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 43 posts ]  Go to page Previous  1, 2, 3  Next
Author Message
PostPosted: June 16, 2018, 4:54 am 
Offline
We are Slotus!
User avatar

Joined: October 6, 2009, 9:29 am
Posts: 6969
Location: Tallahassee, FL (The Center of the Known Universe)
Perry-
If I remember my vector sums from Physics 101 back in the year 19(mumble-mumble) it goes something like:
Force1 X Lever Arm1 = Force2 X Lever Arm 2.

Your drawing shows a 72" lever arm and you measured/approximated a 60 lb force needed to lift the load.
If you reduce the length of the lever arm by a factor of 6, as in going from 72" to 12", then it would increase the force by a factor of 6 as in 60 X 6 or 360 lbs. Doesn't sound right, but... I think it is.

Maybe some of the smart kids will chime in here soon...
:cheers:
JDK

_________________
JD, father of Quinn, Son of a... Build Log
Quinn the Slotus:Ford 302 Powered, Mallock-Inspired, Tube Frame, Hillclimb Special
"Gonzo and friends: Last night must have been quite a night. Camelot moments, mechanical marvels, Rustoleum launches, flying squirrels, fru-fru tea cuppers, V8 envy, Ensure catch cans -- and it wasn't even a full moon." -- SeattleTom


Top
 Profile  
Reply with quote  
PostPosted: June 16, 2018, 7:17 am 
Offline

Joined: August 28, 2010, 7:53 am
Posts: 178
Can u put a scale under the proposed lift point to see what the actual weight is?
It should be less than 360lbs since not all the weight is 60" past the pivot.
still need a smart kid to chime in, though


Top
 Profile  
Reply with quote  
PostPosted: June 16, 2018, 9:51 am 
Offline
User avatar

Joined: July 17, 2008, 9:11 am
Posts: 4620
Location: West Chicago,IL
JD's math is right. Are you using the struts only to help lift? Or do you intend on using them to hold things in the open position? Your geometry and # rating will change depending on your goal. How do you plan on attaching the one strut on the driver's side. Won't it get in the way of your access door?


Speaking of access doors, is there any reason you didn't extend the hinge all the way to the lower tube? I would think that the triangle area left will eventually get you in the back or head.

You might PM to trialsmangasgas. He has a similar type trailer I think.


Attachments:
Inkedtest_LI.jpg
Inkedtest_LI.jpg [ 981.3 KiB | Viewed 748 times ]

_________________
Chuck.

“Any suspension will work if you don’t let it.” - Colin Chapman

Visit my active Cushman Truckster resurrection log: over HERE
or my archival Locost build log: over HERE
Top
 Profile  
Reply with quote  
PostPosted: June 20, 2018, 2:19 am 
Offline
User avatar

Joined: March 19, 2011, 10:22 am
Posts: 1126
Location: Holden, Alberta, Canada
rx7locost wrote:
is there any reason you didn't extend the hinge all the way to the lower tube?


Yes, I'm trying to watch my weight. My goal is fit through the size of egress I've fabricated and this gives me incentive! Plus there is a locating pin a couple of inches past the door on the lower rail that keeps the egress/access door/hatch and lower frame in the same plane (did I say that correct?).

_________________
Perry

'If man built it, man can fix it'
"No one ever told me I couldn't do it."
"If you can't build it safe, don't build it."

Perry's Locost Super Che7enette Build
Perry's TBird Based 5.0L Super 7 L.S.O.
Perry's S10 Super 7 The 3rd
Perry's 4th Build, The Topolino 500 (Little Mouse) Altered


Top
 Profile  
Reply with quote  
PostPosted: June 22, 2018, 1:31 am 
Offline
User avatar

Joined: March 19, 2011, 10:22 am
Posts: 1126
Location: Holden, Alberta, Canada
Bit of an update. Final welding on 3/4" tubing. Purchased a couple of 200# gas springs to ease the pain on my back when opening the rear hatch. Finished painting the enclosure frame. Started fitting aluminum sheeting to frame. Again using Clecos, enabling me to fit the sheets, then remove them to remove swarf, fit them again before final riveting. Clecos are spaced every second rivet hole. Rivets are 4" apart, which is safe spacing as long as VNE is under 140mph, anything over that I would have to space the rivets 2" apart :lol: .
For me this part of the build is relaxing work, pink is a passive color. Cutting sheets with a carbide knife and straight edge, no shears allowed :wink:


Attachments:
File comment: Pic of corner door frame and newly welded anchor D
IMG_3799.JPG
IMG_3799.JPG [ 101.89 KiB | Viewed 603 times ]
File comment: Using Clecos for fitment
IMG_3798.JPG
IMG_3798.JPG [ 62 KiB | Viewed 603 times ]
File comment: Fitting sheeting to frame
IMG_3797.JPG
IMG_3797.JPG [ 114.61 KiB | Viewed 603 times ]

_________________
Perry

'If man built it, man can fix it'
"No one ever told me I couldn't do it."
"If you can't build it safe, don't build it."

Perry's Locost Super Che7enette Build
Perry's TBird Based 5.0L Super 7 L.S.O.
Perry's S10 Super 7 The 3rd
Perry's 4th Build, The Topolino 500 (Little Mouse) Altered
Top
 Profile  
Reply with quote  
PostPosted: June 22, 2018, 8:17 pm 
Offline
User avatar

Joined: March 19, 2011, 10:22 am
Posts: 1126
Location: Holden, Alberta, Canada
Just thought I'd do a bit of show and tell on how I cut .040" aluminum sheet, again. I do this also on the 7's.

No matter how careful or relaxed I am, I can not cut a straight line with shears, a least not to my critical eye.

So this is how I do it. I use a 1/8" x 1 1/4" x 8' long straight edge. I also use a 1" sq 4' and 8' long piece of tubing for clamping the sheet along the edge of the table.

Measure the sheet to be cut, clamp the straight edge to the marks. Use carbide scribe to score the sheet. I usually score the line about 14 times, 2 very light passes at first to set the line, then moderate pressure to score the line.
Attachment:
File comment: Straight edge clamped on measured cut marks
IMG_3800.JPG
IMG_3800.JPG [ 61.76 KiB | Viewed 559 times ]

Attachment:
File comment: Carbide scribe
IMG_3801.JPG
IMG_3801.JPG [ 45.31 KiB | Viewed 559 times ]

Remove the straight edge and sweep the swarf from the score line.
Attachment:
File comment: Score line after 12 passes with carbide scribe
IMG_3802.JPG
IMG_3802.JPG [ 37.77 KiB | Viewed 559 times ]

Then using square tube I clamp the sheet to match the score line to the edge of the table (it helps when the table has a sharp edge to it).
Attachment:
File comment: Score line clamped to edge of table
IMG_3803.JPG
IMG_3803.JPG [ 58.2 KiB | Viewed 559 times ]

Then using both hands, palm on sheet along score line and other hand bending sheet down. It usually takes about 3-4 passes, using greater force each time, to bend the sheet along the score line. Once resistance starts to lessen, I bend the sheet up and down a bit at a time till the score breaks.
Attachment:
File comment: Bending sheet along score line
IMG_3804.JPG
IMG_3804.JPG [ 68.38 KiB | Viewed 559 times ]

Attachment:
File comment: Sheet broken along score line
IMG_3805.JPG
IMG_3805.JPG [ 67.95 KiB | Viewed 559 times ]

I then take a file and dress the edge. Prevents bleeding when working with the sheet in the future.


The following pics use the same process to score and break a 82" sheet. This method results in a very satisfactory edge to the critical eye.
Attachment:
File comment: Doing an 82" score, carbide cutter scored about 14 times
IMG_3806.JPG
IMG_3806.JPG [ 71.25 KiB | Viewed 559 times ]

Attachment:
File comment: Straight edge removed from score line, note the swarf
IMG_3807.JPG
IMG_3807.JPG [ 45.85 KiB | Viewed 559 times ]

Attachment:
File comment: Sheet clamped along score line and initial bending
IMG_3808.JPG
IMG_3808.JPG [ 63.26 KiB | Viewed 559 times ]

Attachment:
File comment: 82" sheet broken along score line, very straight edge
IMG_3809.JPG
IMG_3809.JPG [ 61.26 KiB | Viewed 559 times ]

_________________
Perry

'If man built it, man can fix it'
"No one ever told me I couldn't do it."
"If you can't build it safe, don't build it."

Perry's Locost Super Che7enette Build
Perry's TBird Based 5.0L Super 7 L.S.O.
Perry's S10 Super 7 The 3rd
Perry's 4th Build, The Topolino 500 (Little Mouse) Altered


Top
 Profile  
Reply with quote  
PostPosted: June 23, 2018, 5:53 am 
Offline
We are Slotus!
User avatar

Joined: October 6, 2009, 9:29 am
Posts: 6969
Location: Tallahassee, FL (The Center of the Known Universe)
Very clever, Perry! Nice straight line "cuts"... Mama always said you wuz th' smart one in the family... :mrgreen:

_________________
JD, father of Quinn, Son of a... Build Log
Quinn the Slotus:Ford 302 Powered, Mallock-Inspired, Tube Frame, Hillclimb Special
"Gonzo and friends: Last night must have been quite a night. Camelot moments, mechanical marvels, Rustoleum launches, flying squirrels, fru-fru tea cuppers, V8 envy, Ensure catch cans -- and it wasn't even a full moon." -- SeattleTom


Top
 Profile  
Reply with quote  
PostPosted: June 23, 2018, 2:22 pm 
Offline
User avatar

Joined: October 24, 2008, 2:13 pm
Posts: 3485
Location: Carlsbad, California, USA
Nice idea, Perry.

Thanks,

_________________
Damn! That front slip angle is way too large and the Ackerman is just a muddle.

Build Log: viewtopic.php?f=35&t=5886


Top
 Profile  
Reply with quote  
PostPosted: June 23, 2018, 2:52 pm 
Offline
User avatar

Joined: October 23, 2010, 2:40 am
Posts: 1034
Great technique, Perry. An airplane-builder friend gave me the same cutting tool a while back. Since then I've been using the carbide-cutter / straight-edge approach on 0.050" aluminum, but trying to cut most of the way through. Works nicely, but very time consuming. Your score-then-bend-till-it-breaks approach should shorten the process considerably. Thanks for the tip!

+1 on filing the cut edge. Don't ask me how I know. :BH:
Alternatively, one could use the un-filed edge to shave with.

_________________
Cheers, Tom

My Car9 build: viewtopic.php?f=35&t=14613
"It's the construction of the car-the sheer lunacy and joy of making diverse parts come together and work as one-that counts."

Ultima Spyder, Northstar 4.0, Porsche G50/52


Top
 Profile  
Reply with quote  
PostPosted: June 24, 2018, 7:04 am 
Offline
We are Slotus!
User avatar

Joined: October 6, 2009, 9:29 am
Posts: 6969
Location: Tallahassee, FL (The Center of the Known Universe)
Quote:
+1 on filing the cut edge. Don't ask me how I know
Sounds like you had a Team Slotus moment. "Bubba! Fetch the bandaids and Mercurochrome!"


Top
 Profile  
Reply with quote  
PostPosted: June 26, 2018, 8:32 pm 
Offline
User avatar

Joined: March 19, 2011, 10:22 am
Posts: 1126
Location: Holden, Alberta, Canada
GonzoRacer wrote:
Mercurochrome

Holy heck, JD, that takes me back 50 years. Can you still buy Mercurochrome? I remember my mom putting it on my wounds, the stinging, sooo much red, couldn't tell whether it was blood or Mercurochrome, ohh the pain, the horrible pain. Ahhh, the good old day memories.

Bit of a progress update. Front part of the trailer panel riveted. Still need to sheet the 3 doors. The center door is removable to allow me to put my winch in place if need be. Beginning to cut, fit, and 'Cleco' rear panels.
Attachment:
File comment: DS 3/4 front view
IMG_3820.JPG
IMG_3820.JPG [ 81.37 KiB | Viewed 365 times ]

Attachment:
File comment: PS 3/4 front view
IMG_3819.JPG
IMG_3819.JPG [ 90.19 KiB | Viewed 365 times ]

Attachment:
File comment: Inside view
IMG_3823.JPG
IMG_3823.JPG [ 111.57 KiB | Viewed 365 times ]

Attachment:
File comment: Fitting panels on DS rear
IMG_3821.JPG
IMG_3821.JPG [ 88.44 KiB | Viewed 365 times ]

_________________
Perry

'If man built it, man can fix it'
"No one ever told me I couldn't do it."
"If you can't build it safe, don't build it."

Perry's Locost Super Che7enette Build
Perry's TBird Based 5.0L Super 7 L.S.O.
Perry's S10 Super 7 The 3rd
Perry's 4th Build, The Topolino 500 (Little Mouse) Altered


Top
 Profile  
Reply with quote  
PostPosted: June 26, 2018, 8:41 pm 
Offline
User avatar

Joined: November 11, 2013, 4:47 am
Posts: 873
Location: No. Nevada
Not exactly an "Airstream" is it?
Probably will not matter much from behind the hulking wall towing it. :wink:

_________________
If I must be a one-man PC free zone, so be it!


Top
 Profile  
Reply with quote  
PostPosted: June 29, 2018, 12:53 am 
Offline
User avatar

Joined: March 19, 2011, 10:22 am
Posts: 1126
Location: Holden, Alberta, Canada
RichardSIA wrote:
Not exactly an "Airstream" is it?

Nope, I'd have to charge more for airstream pictures :D
RichardSIA wrote:
Probably will not matter much from behind the hulking wall towing it.

Exactly what I figure!



Got all the big sheeting fitted, drilled, swarf removed, and set all the rivets. Some pics.
The picture's don't do it justice, it's bigger than what the pictures look like (that's what I tell the wifey anyhow). She said 'wishful thinking' :D
Next is covering the 2 front side doors and front cover that allows access to the winch mount (heaven forbid I'd have to use it).


Attachments:
File comment: PS rear corner view
IMG_3834.JPG
IMG_3834.JPG [ 74.51 KiB | Viewed 273 times ]
File comment: DS rear corner view
IMG_3837.JPG
IMG_3837.JPG [ 82.38 KiB | Viewed 273 times ]
File comment: Rear hatch suitcase latch
IMG_3836.JPG
IMG_3836.JPG [ 54.1 KiB | Viewed 273 times ]
File comment: Latches
IMG_3838.JPG
IMG_3838.JPG [ 55.58 KiB | Viewed 273 times ]
File comment: DS front corner view
IMG_3839.JPG
IMG_3839.JPG [ 80.01 KiB | Viewed 273 times ]
File comment: PS front corner view
IMG_3840.JPG
IMG_3840.JPG [ 85.9 KiB | Viewed 273 times ]

_________________
Perry

'If man built it, man can fix it'
"No one ever told me I couldn't do it."
"If you can't build it safe, don't build it."

Perry's Locost Super Che7enette Build
Perry's TBird Based 5.0L Super 7 L.S.O.
Perry's S10 Super 7 The 3rd
Perry's 4th Build, The Topolino 500 (Little Mouse) Altered
Top
 Profile  
Reply with quote  
PostPosted: June 29, 2018, 3:49 am 
Offline
User avatar

Joined: November 11, 2013, 4:47 am
Posts: 873
Location: No. Nevada
Looking forward to the "Tuft test" pics.
Will the trailer be "Drafting" the tow vehicle at average speed, or acting as a big air-brake?
Image
Probably depends on how short the tongue and hitch are.

_________________
If I must be a one-man PC free zone, so be it!


Top
 Profile  
Reply with quote  
PostPosted: June 29, 2018, 12:38 pm 
Offline
User avatar

Joined: October 24, 2008, 2:13 pm
Posts: 3485
Location: Carlsbad, California, USA
It's looking really good, Perry. And, it's definitely not just another aluminum siding, over-decaled, toy hauler either. It's quite innovative.

My only concern is the unlocked, sliding bolts on the side hatch(es). You just know that somewhere in your travels, some dummy is going to have to open them to see what's in the trailer. Of course, he's also going to leave the bolt open when he closes the hatch, so you can discover that on the Interstate when it starts banging around in the wind.

I really like those suitcase latches - simple, strong, locking.

@RichardSIA
You know that tuft test wouldn't be a bad idea. Perry's RV may already have a rear video camera for backing up. I predict it will improve his aero performance because it extends the length of his envelope (RV + trailer), which will let the airstreams come together more gradually at the back.

Cheers,

_________________
Damn! That front slip angle is way too large and the Ackerman is just a muddle.

Build Log: viewtopic.php?f=35&t=5886


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 43 posts ]  Go to page Previous  1, 2, 3  Next

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
POWERED_BY