Dumas Thriftway Too Rebuild  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
    Search This Thread  
 
Printable Version


NEW MHZ Speedmaster S6 Stern Drives - price reduced!! - Kit
Seller:  Justaddwata
Details:   $500.00   |  10/30/2009   |  Classified Ad
We will rotate YOUR AD in this spot if you select "Forum Featured" when placing or editing your ad!

All Forums >> RC Boats >> Speed - RC Nitro Boats >> Dumas Thriftway Too Rebuild
Page: [1]

Login
Message << Older Topic   Newer Topic >>
Dumas Thriftway Too Rebuild - 5/18/2009 7:57 PM   
ic-racer


 

Posts: 61
Score: 100
Joined: 10/14/2007
Last Login: 6/30/2009
From: , USA
Status: offline 		 Here are some pictures of a current project. I'm redoing a Dumas Thriftway Too that I built in 1973. At the time it used a huge single channel radio that filled the whole rear of the boat and a control-line aircraft engine.

Current engine and running gear come from a .16 Megatech Wicked Angel that crumbled to pieces after a few runs.

The little picture is from about 1974, it's maiden voyage.




< Message edited by ic-racer -- 6/11/2009 3:02 PM >

Hide Signatures
       Post #: 1

RE: Dumas Thriftway Too Rebuild - 5/18/2009 8:06 PM   
ic-racer


 

Posts: 61
Score: 100
Joined: 10/14/2007
Last Login: 6/30/2009
From: , USA
Status: offline 		 I'm using these little micro servos because this really is a small boat (24"), and there is not much room. These tiny Hitecs have 33 oz/in of torque, so they will be more than adequate.
Interesting that I found the drive-dog adapter to be drilled off-center. I thought the Megatech vibrated a lot, That probably contributed to the early demise of the Wicked Angel  
I found a place that has a new one, lets hope it is straight. Since the Megatech hardware is practically brand-new, I'd like to use it. If I went with another setup, I'd need everything from flywheel to prop and that would be more that I want to spend. I don't expect this to be a super-performer, I'm just re-building it for nostalgia.




Hide Signatures

(in reply to ic-racer)
       Post #: 2

RE: Dumas Thriftway Too Rebuild - 5/18/2009 8:07 PM   
ic-racer


 

Posts: 61
Score: 100
Joined: 10/14/2007
Last Login: 6/30/2009
From: , USA
Status: offline 		 Maybe you can see, I used that trick of heating the fuel tank to melt it a little and re-shape it to clear the flywheel and clutch. It worked out very well.

Hide Signatures

(in reply to ic-racer)
       Post #: 3

RE: Dumas Thriftway Too Rebuild - 5/19/2009 4:09 AM   
srw1960


 

Posts: 419
Score: 100
Joined: 3/15/2007
Last Login: 10/20/2009
From: kingwood, TX, USA
Status: offline 		Way cool!!!! I love to see the older boats brought back to life..and it looks like you are doing a very nice job of it at that...Heres a pic of an old what I think is a mid 50s shovelnose hydro that I am starting to restore...I have installed a pico 67,all aluminum running gear,new flex shaft and stuffing tube and a spektrum dx3 radio system...it is almost ready for paint I hope to have it on the water by the end of summer ....When I got it there was a very very old K&B 60 airplane engine in it with a kool klamp on the head and the old aircraft muffler hanging out the side and a heathkit radio straight from the late 60s...There was a couple holes that had been patched over on the side I think it may have been tethered at one point.....Keep up the good work  we need more these boats on the water again where they belong...

Attachments
Click to see fullsize image.
Click for fullsize


Hide Signatures

(in reply to ic-racer)
       Post #: 4

RE: Dumas Thriftway Too Rebuild - 5/19/2009 2:16 PM   
ic-racer


 

Posts: 61
Score: 100
Joined: 10/14/2007
Last Login: 6/30/2009
From: , USA
Status: offline 		 Thanks for sharing that picture of the older boat. I also have a project on the back-burner. I have an old hydro-air boat that is of un-known age, however, the plans for the boat date back to the 60s.







Hide Signatures

(in reply to srw1960)
       Post #: 5

RE: Dumas Thriftway Too Rebuild - 5/19/2009 2:21 PM   
ic-racer


 

Posts: 61
Score: 100
Joined: 10/14/2007
Last Login: 6/30/2009
From: , USA
Status: offline 		 Here is a picture of that airboat design from the original construction article. I don't have a date on the article, but they speak of two channels each for steering and throttle, so I am thinking probably 60s with escapement servos.



Hide Signatures

(in reply to ic-racer)
       Post #: 6

RE: Dumas Thriftway Too Rebuild - 5/20/2009 5:04 AM   
srw1960


 

Posts: 419
Score: 100
Joined: 3/15/2007
Last Login: 10/20/2009
From: kingwood, TX, USA
Status: offline

It's funny you have that air hydro...just a few weeks ago I bought an air powered pickle fork hydro off e bay ..the guy did a terrible job packing it and it arrived all busted up but I had planned on re engineering it anyway Ill snap a pic tomorrow and post it for ya..I have a super tiger g90 that i plan on powering it with it oughta be alot of fun on the water..youre's will be too looks like some decent wood under all that paint too...



Hide Signatures

(in reply to ic-racer)
       Post #: 7

RE: Dumas Thriftway Too Rebuild - 6/4/2009 2:31 PM   
ic-racer


 

Posts: 61
Score: 100
Joined: 10/14/2007
Last Login: 6/30/2009
From: , USA
Status: offline 		I have the servos mounted and the stuffing tube is glued in. Pics to follow....

Hide Signatures

(in reply to srw1960)
       Post #: 8

RE: Dumas Thriftway Too Rebuild - 6/6/2009 5:13 PM   
ic-racer


 

Posts: 61
Score: 100
Joined: 10/14/2007
Last Login: 6/30/2009
From: , USA
Status: offline 		I converted this portion of  the hull into a radio box. This will have a plexiglass cover, held on with radio box tape.

Attachments
Click to see fullsize image.
Click for fullsize


Hide Signatures

(in reply to ic-racer)
       Post #: 9

RE: Dumas Thriftway Too Rebuild - 6/6/2009 5:16 PM   
ic-racer


 

Posts: 61
Score: 100
Joined: 10/14/2007
Last Login: 6/30/2009
From: , USA
Status: offline 		 Here it is while the glue sets on a little bulkhead I made to separate the engine compartment from the radio box. The drive shaft stuffing tube is right from the Wicked Angel. 

The muffler looks a little funny but I'm not excited about tearing up my mahogany deck to make room for the muffler pointing the other way. A muffler extension would work, but they don't come in this small of a size.

Attachments
Click to see fullsize image.
Click for fullsize


< Message edited by ic-racer -- 6/6/2009 5:20 PM >

Hide Signatures

(in reply to ic-racer)
       Post #: 10

RE: Dumas Thriftway Too Rebuild - 6/6/2009 5:22 PM   
ic-racer


 

Posts: 61
Score: 100
Joined: 10/14/2007
Last Login: 6/30/2009
From: , USA
Status: offline 		 Here is the Wicked Angel's stuffing tube. 

Attachments
Click to see fullsize image.
Click for fullsize


Hide Signatures

(in reply to ic-racer)
       Post #: 11

RE: Dumas Thriftway Too Rebuild - 6/11/2009 3:04 PM   
ic-racer


 

Posts: 61
Score: 100
Joined: 10/14/2007
Last Login: 6/30/2009
From: , USA
Status: offline 		Some recent pictures showing the completed engine installation and radiobox. 

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


Hide Signatures

(in reply to ic-racer)
       Post #: 12

RE: Dumas Thriftway Too Rebuild - 6/13/2009 6:34 AM   
srw1960


 

Posts: 419
Score: 100
Joined: 3/15/2007
Last Login: 10/20/2009
From: kingwood, TX, USA
Status: offline 		What engine are you using???and where did you get a collet that fit the threads and the cable???
Nice work you are doing there by the way  ...My golden oldie has been identified as a dumas dragon fly 60 thanks to jet pack for helping with that...Ihave it in primer now and should have it in color and finished by next weekend

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


Hide Signatures

(in reply to ic-racer)
       Post #: 13

RE: Dumas Thriftway Too Rebuild - 6/13/2009 10:46 PM   
ic-racer


 

Posts: 61
Score: 100
Joined: 10/14/2007
Last Login: 6/30/2009
From: , USA
Status: offline 		I remember that name from some old Dumas ads. Looks like it is coming along nice.

In terms of my hardware, everything is directly out of the Megatech Wicked Angel. It is a .16 engine with a somewhat small flywheel with two RC car type clutch shoes. There is a needle bearing for the clutch bell (the Achilles Heel of the system) and the drive dog is screwed on to the clutch bell in place of the pinion gear that would normally be on a car. The drive dog then goes to a solid shaft that is supported in a stuffing tube. There are bronze bearings on either end to support the shaft.

Hide Signatures

(in reply to srw1960)
       Post #: 14

RE: Dumas Thriftway Too Rebuild - 6/14/2009 4:25 AM   
srw1960


 

Posts: 419
Score: 100
Joined: 3/15/2007
Last Login: 10/20/2009
From: kingwood, TX, USA
Status: offline 		Thanks for the info Ill try to find the megatech site and see what parts I can order fom them I am building some small1/2 a size boats and the engine I am going to use came from a car..the main thing I need is the collet....if the collet screws onto the crankshaft how does the clutch work???wouldnt the collet have to be attached to the clutch bell in some way???

Hide Signatures

(in reply to ic-racer)
       Post #: 15

RE: Dumas Thriftway Too Rebuild - 6/14/2009 5:56 PM   
ic-racer


 

Posts: 61
Score: 100
Joined: 10/14/2007
Last Login: 6/30/2009
From: , USA
Status: offline 		The only thing screwed onto the engine shaft is the pilot shaft which holds the flywheel on and provides a shaft on which the clutch bell can spin. There is no collet, The propeller shaft fits into the end of the drive dog and is held in place with a set screw. The propeller shaft is nice in that it has flats for the setscrews at both ends.

I got some replacement parts (new pilot shaft, bearing and drive dog) here, and they had the parts in stock. http://www.rchobbyexplosion.com/Megatech_Boat_Parts_s/57.htm

Hide Signatures

(in reply to srw1960)
       Post #: 16

RE: Dumas Thriftway Too Rebuild - 6/16/2009 12:13 AM   
srw1960


 

Posts: 419
Score: 100
Joined: 3/15/2007
Last Login: 10/20/2009
From: kingwood, TX, USA
Status: offline 		Cool thanks for the info I will go and check there sight out and see if they have anything I can use on my projects...

Hide Signatures

(in reply to ic-racer)
       Post #: 17

RE: Dumas Thriftway Too Rebuild - 6/29/2009 9:17 PM   
ic-racer


 

Posts: 61
Score: 100
Joined: 10/14/2007
Last Login: 6/30/2009
From: , USA
Status: offline 		So here is an update on the boat's performance.

I had it out on the lake last week and it is great for a 'fun' type boat. I put a turning fin on it and it turns really well. It is a little faster than I expected. Stability was good. It is a pretty heavy package, so its no racer, but certainly more for the pond than the display shelf.

There were no driveline or engine problems. The main problem was water getting into the radio box. I have it back in the workshop to sort it all out. I don't know where it leaks from, but I might strip out all the radio gear and fill it with water and see where the water leaks out. It was leaking quite a bit of water so the leak should be easy to detect.

Hide Signatures

(in reply to srw1960)
       Post #: 18

Page:   [1]
All Forums >> RC Boats >> Speed - RC Nitro Boats >> Dumas Thriftway Too Rebuild
Page: [1]





Jump to:


 
Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

© 2001 - 2007 24-7 RC, LLC, all rights reserved.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America

Kaango.com Classifieds

0.891RCU1