{"id":1190,"date":"2013-05-02T22:59:46","date_gmt":"2013-05-03T02:59:46","guid":{"rendered":"http:\/\/pappp.net\/?p=1190"},"modified":"2013-05-02T22:59:46","modified_gmt":"2013-05-03T02:59:46","slug":"learning-to-ldp","status":"publish","type":"post","link":"https:\/\/pappp.net\/?p=1190","title":{"rendered":"Learning to LDP"},"content":{"rendered":"<p>I&#8217;ve wanted to learn to LDP (Long Distance Pump) since before I started skating.  Every summer, I spend some time trying to learn to pump, and make minor adjustments to my setups to make it more practical, and for my efforts I could <em>impart<\/em> energy, but my setups have always been sufficiently sub-optimal that I only managed sustain speed with a pump a handful of times, and never accelerated.  <\/p>\n<p><a href=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/LDParts_md.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/LDParts_md-300x225.jpg\" alt=\"LDParts_md\" width=\"300\" height=\"225\" class=\"aligncenter size-medium wp-image-1200\" srcset=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/LDParts_md-300x225.jpg 300w, https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/LDParts_md-1024x768.jpg 1024w, https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/LDParts_md.jpg 1632w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>This summer I decided do it right. I bought the classic inexpensive LDP truck set (A Bennett Vector and a Tracker RTS, I picked the 5.0 and 129mm variants respectively), modded them for LDP, and installed them on my suitably sized deck with suitable bushings and wheels. <\/p>\n<p>Distance skating attracts the best sort of crazies &#8211; It&#8217;s something of an equipment sport, so they tend to obsessively purchase and modify gear.  It&#8217;s remarkably physically demanding, so there is a lot of the classic solo endurance sport mentality.  It also has carryover from the &#8220;raah hardcore&#8221; skate world.  Fortunately, the internet has brought together the appropriate crazies at sites like <a href=\"http:\/\/pavedwave.org\/\">Pavedwave<\/a> and <a href=\"http:\/\/www.skatefurther.com\/\">skatefurther<\/a>, where the discipline has been developed from its roots in the 70s.  <\/p>\n<p>Designed-for-LDP decks (Subsonic Pulse, LBL Walkabout, RoeRacing Mermaid, etc.) are boutique items and tend to cost in excess of $150 for the bare deck, so I wanted to ease in financially in smaller steps since I&#8217;m not sure how capable I&#8217;ll be.  Most sources say 26&#8243; to 31&#8243; is suitable for an LDP wheelbase, and my Pakala III is around 25.6, so it is manageable if a little tight-pumping.  <\/p>\n<p>The mods for the trucks are pretty interesting, I implemented a number of the suggestions from <a href=\"http:\/\/pavedwave.myfastforum.org\/viewtopic.php?t=2619&amp;start=0\">this excellent thread<\/a> on the pavedwave forums.<\/p>\n<div id='gallery-1' class='gallery galleryid-1190 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/pappp.net\/?attachment_id=1194'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/BennettDia_md-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/pappp.net\/?attachment_id=1193'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/BennettDepth_md-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/pappp.net\/?attachment_id=1197'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/BennettRough_md-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/pappp.net\/?attachment_id=1198'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/BennettScribe_md-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/pappp.net\/?attachment_id=1195'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/BennettDrill_md-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/pappp.net\/?attachment_id=1192'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/BennettBush_md-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/pappp.net\/?attachment_id=1196'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/BennettPolish_md-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/pappp.net\/?attachment_id=1199'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/TrackerClippedWings_md-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl>\n\t\t\t<br style='clear: both' \/>\n\t\t<\/div>\n\n<p>On the Bennett, I made myself a nice <a href=\"https:\/\/en.wikipedia.org\/wiki\/Polyoxymethylene\">Polyoxymethylene<\/a>(aka Delrin\/Acetal) insert for the pivot.  I think the technical name for this thing would be a bushing, but since that term is already in use for trucks, people have taken to calling these &#8220;hobo sphericals&#8221; or &#8220;fixed spehericals,&#8221; as the more elaborate alternative is to install a spherical bushing.  I saw that Griffin sells <a href=\"http:\/\/www.griffinskateboards.com\/grennett.html\">fixed spehricals<\/a> for Bennett trucks that look to be machined out of some flavor of Polyoxymethylene, looked at the <a href=\"http:\/\/www.amazon.com\/gp\/product\/B000FPD62Y\/ref=oh_details_o01_s01_i00?ie=UTF8&#038;psc=1\">sheet of 1\/8&#8243; Aceteal<\/a> I had for another project, and decided to DIY. For those looking closely at the numbers, the insert is a little thinner than ideal (0.125&#8243; sheet, gap depth measures around 0.16&#8243;) but it seems sufficient. <\/p>\n<p>I hacked a small chunk off the sheet, held it under the truck pivot, and scribed the diameter into the sheet with a pin.  I then did the typical chords-and-90\u00b0-angles center of a circle stunt, sanity checked it against a washer, and drilled the center to 25\/64&#8243; in a couple steps (starter drill, some intermediate size grabbed at random, 3\/8&#8243; because I wasn&#8217;t sure how sloppy I was being, then 25\/64&#8243;) &#8212; Kingpins are 3\/8, and it should slide freely, so a V letter drill would probably be technically correct, but I&#8217;ve never contrived an excuse to own a letter drill set, and was free-handing it with pliers and a handheld drill anyway, so 25\/64. I then followed my scribe line with a coarse sanding drum chucked into a rotary tool, and fitted\/finished it with a finer sanding drum.  I&#8217;ve checked on it a couple times as I fiddle with the configuration, and it seems to be holding up and doing its job.  <\/p>\n<p>If I ever get my Shapeoko into shape for this sort of thing I should be able to punch out some nice precision parts for this on it. <\/p>\n<p>On the RTS, I clipped the wings a bit with a file, as apparently the wings will chew up the pivot cup if you don&#8217;t.  I then polished out the file marks and the whole pivot pin on both trucks with some tripoli compound and a felt wheel chucked up in a rotary tool.<\/p>\n<p><a href=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/Inital_LDP_Setup_md.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/Inital_LDP_Setup_md-1024x328.jpg\" alt=\"Inital_LDP_Setup_md\" width=\"640\" height=\"205\" class=\"aligncenter size-large wp-image-1202\" srcset=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/Inital_LDP_Setup_md-1024x328.jpg 1024w, https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/Inital_LDP_Setup_md-300x96.jpg 300w, https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/Inital_LDP_Setup_md.jpg 1917w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<p>At the moment I have the Bennett wedged to +10\u00b0, with Green and Yellow tall Reflex barrels, and the RTS at -7\u00b0 with some blue Khiro barrels I had around, both stacked on top of 3\/4&#8243; of risers to keep it from biting &#8211; gives a ~5&#8243; ride height, which is not ideal.<\/p>\n<p>I built up speed by pumping the first time I stepped on this thing (and then <a href=\"https:\/\/pappp.net\/wp-content\/uploads\/2013\/05\/Risers_md.jpg\">wheelbit<\/a>, got some road rash on my elbow, installed some more risers, and accelerated again without the painful sudden deceleration). I&#8217;m still clumsy and slow pumping, and I&#8217;m sure the setup can be improved, but it feels wild, and the dedicated trucks make a world of difference. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>I&#8217;ve wanted to learn to LDP (Long Distance Pump) since before I started skating. Every summer, I spend some time trying to learn to pump, and make minor adjustments to my setups to make it more practical, and for my &hellip; <a href=\"https:\/\/pappp.net\/?p=1190\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,6,1,10],"tags":[],"class_list":["post-1190","post","type-post","status-publish","format-standard","hentry","category-diy","category-entertainment","category-general","category-objects"],"_links":{"self":[{"href":"https:\/\/pappp.net\/index.php?rest_route=\/wp\/v2\/posts\/1190","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pappp.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pappp.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pappp.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pappp.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1190"}],"version-history":[{"count":0,"href":"https:\/\/pappp.net\/index.php?rest_route=\/wp\/v2\/posts\/1190\/revisions"}],"wp:attachment":[{"href":"https:\/\/pappp.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1190"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pappp.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1190"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pappp.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1190"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}