[TowerTalk] ROHN 65-G where do we get 200' of it.. + mating gin-pole ?

[Wayne Kline]

Hi Jim

 

 I have 150' of Rohn 65G. I picked this tower up ( scrap steel price). it's the 20ft sections except for the tapered base ,it's 10'.

 W3MM has a Rohn 65G /SSVT gin pole, But I opted to use a crane. Three sets of guys ( also Polygon fiberglass rod) 

 I pre prepared the tower for three lifts 60' 60' and 30'. Each 60' lift had the poly rods pre attached and terminated B-4 the next lift. 

 The crane arrived at 8:15AM and gone by 11:00AM .

 You have a BIG wind load above the top guy and IMHO would opt for the 4th set  45.90,135,180 and a 20' top section free standing.

 

 The stuff is Varsity big league tower . not something a single climber can muscle around like 25.45 or 55 G  Heck the side rails are 2" OD 125 wall. the rungs step is 21+ in. ( Takes some getting use to the BIG step)

 

 YMMV

 

 73's Wayne W3EA

> From: Jim.thom at telus.net
> To: towertalk at contesting.com
> Date: Wed, 17 Feb 2010 05:10:07 -0800
> Subject: [TowerTalk] ROHN 65-G where do we get 200' of it.. + mating gin-pole ?
> 
> A buddy of mine needs 190-200' of Rohn 65-G.. and pretty soon. He would like to use the 10' sections , and not the 20's... if 
> at all possible. The plan was to use 3-4 x KX0G rings + KX0G base rotor. Also, 3/8" Polygon rod guy wire to be used.
> 
> Top ring was to be at the 165' level.. and have 25' of UN-supported tower above it. [ or guy at 175'.. and have same 25' un-supported portion above top guys] 
> On that 25' of Un-supported portion, a 2 el 80m yagi [ M2] was to be installed, along with a m2 4 x el 40m yagi.. and also a 5 x el 20m m2 yagi. 
> 
> Lower down, the plan was for a 2nd 4-el 40m yagi... and also TWO more 5-el 20m yagi's... and also single yagi's for 17-15-10-6m.
> 
> IE: 10 [ TEN] yagi's in all. Will 65-G take this kind of load ?? Max wind gust ever recorded in the last 10 x yrs at this location was 57 mph [ at the 160' level of another tower] 
> 
> In looking through old Rohn catalog I have..... the "safe moment of restraint" is :
> 
> 45g- 9610 ft lbs aprx $269.00 per 10' section
> 55g- 17,160 ft lbs aprx $319.00 per 10' section
> 65g- 33,200 ft lbs aprx $365.00 per 10' section 
> 
> Seems to me that's a huge diff, between 45 g and 55g... another huge diff, between 55g and 65g . 
> 
> The game plan was to opt for 65-G.... if we can find some... new. The gin pole is what's giving us the run around. Any idea's.... or general notes with 65-G owners would be appreciated. EG; install procedures unique to 65-g .. pitfalls.. 'gotcha's, etc. 
> 
> Per Rohn book, 3 x sets of guys are required. But this is a wicked load. 4 x sets of guys can be used, if required . 
> 
> Later......... Jim VE7RF
> 
> 
> 
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