Hi, I purchased a Darnell model submarine off an auction site. The seller told me that it all worked, but on unpacking the model I found that it had been robbed of a lot of it running gear. The biggest problem I have is the air pump. The original pump I believe was very small from a steam model boat. But today I can’t find a small bi-directional air pump that will do the job, I have purchased around three pumps on line, only to find that they are one direction, or too big like the one in the picture, which will not allow space for a battery in the compartment. I don’t really want to rip it all out, so can anyone help with pointing me to a suitable air pump. Thanks
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Darnell type 21 submarine, need some help
david f- AMS Treasurer
- Posts : 2411
Join date : 2010-11-10
Age : 74
Location : Cumbria
I think I know how you feel. Where do I go from here?!
https://www.theassociationofmodelsubmariners.com/t1092-darnell-type-xx1-graham-s-dad-s-boat-for-refurbishment
I found it very difficult to get the Darnell, as originally designed, to work. Technology moves on.
I don't have much experiences of pumping air but peristaltic pumps can do what you want - rather slowly but they are easily reversible.
https://www.theassociationofmodelsubmariners.com/t1955-nautilus-ii-by-robert-fulton
Sorry I haven't been able to find a photo of the pump I used, but it is very like this one on eBay available for about £35:
https://www.ebay.co.uk/itm/266798195889?itmprp=cksum%3A266798195889a763709292bd48249e3de270920a674d%7Cenc%3AAQAJAAABkP9d%252BMZSXlztIfYFu3kI%252B7ft0VcQix7rTrUVdiJwc2upzwLfM%252B2UEqu0ZqdXqu2qWe6up6s9MSEY%252BWikIwEh4xLkizL%252BG%252Fyhg6cdW4xfkbb75erVQBYYISNxGN1au%252BE0eJ778JYYSAyLJRupNiZky3B2UHpMsaEp7JRgW9fuueOszPlG9eCPE4mSzJx4EejjZE0v1xx3s4HgKujjhEB3s6n28TmXJ5jEirKjJbd11dcK8XU8WGyDI%252Fsd%252BdkX264vp2vTw1B8jX4Pdb9Y0ndSY40sm0IqEHlMrOj2%252Fc4aWUPHXZoQISDdmxnmylyZqjxJGKXRJ20JRCy--Hy9gXhn8eD9JxXp0B7ZWrjx9mCn0iD6l2e3dkIwNUwLzPmnj6Pfi0Zcgadmxm397I7X%252FHIrfwxHMhrk3FohPG8CCdu4HdAd%252FdSF4hwqfgjoLDLHWGSly6Klc39ZGU4RgUE97kAoYpS1AE5XRMwik7WdBDFcTsVaoXoC68IPEg8eVjIcPQkv8LrA%252FeW6qMvrcPP8xldlXB0%253D%7Campid%3APL_CLK%7Cclp%3A4429486&itmmeta=01HYNH5V2MEP7W3S8ZAWGSTRGF
Generally most people pump water. It is easier to do and many pumps are available. I have used car screen wash pumps and have seen caravan water pumps also used.
https://www.theassociationofmodelsubmariners.com/t1092-darnell-type-xx1-graham-s-dad-s-boat-for-refurbishment
I found it very difficult to get the Darnell, as originally designed, to work. Technology moves on.
I don't have much experiences of pumping air but peristaltic pumps can do what you want - rather slowly but they are easily reversible.
https://www.theassociationofmodelsubmariners.com/t1955-nautilus-ii-by-robert-fulton
Sorry I haven't been able to find a photo of the pump I used, but it is very like this one on eBay available for about £35:
https://www.ebay.co.uk/itm/266798195889?itmprp=cksum%3A266798195889a763709292bd48249e3de270920a674d%7Cenc%3AAQAJAAABkP9d%252BMZSXlztIfYFu3kI%252B7ft0VcQix7rTrUVdiJwc2upzwLfM%252B2UEqu0ZqdXqu2qWe6up6s9MSEY%252BWikIwEh4xLkizL%252BG%252Fyhg6cdW4xfkbb75erVQBYYISNxGN1au%252BE0eJ778JYYSAyLJRupNiZky3B2UHpMsaEp7JRgW9fuueOszPlG9eCPE4mSzJx4EejjZE0v1xx3s4HgKujjhEB3s6n28TmXJ5jEirKjJbd11dcK8XU8WGyDI%252Fsd%252BdkX264vp2vTw1B8jX4Pdb9Y0ndSY40sm0IqEHlMrOj2%252Fc4aWUPHXZoQISDdmxnmylyZqjxJGKXRJ20JRCy--Hy9gXhn8eD9JxXp0B7ZWrjx9mCn0iD6l2e3dkIwNUwLzPmnj6Pfi0Zcgadmxm397I7X%252FHIrfwxHMhrk3FohPG8CCdu4HdAd%252FdSF4hwqfgjoLDLHWGSly6Klc39ZGU4RgUE97kAoYpS1AE5XRMwik7WdBDFcTsVaoXoC68IPEg8eVjIcPQkv8LrA%252FeW6qMvrcPP8xldlXB0%253D%7Campid%3APL_CLK%7Cclp%3A4429486&itmmeta=01HYNH5V2MEP7W3S8ZAWGSTRGF
Generally most people pump water. It is easier to do and many pumps are available. I have used car screen wash pumps and have seen caravan water pumps also used.
geofrancis- Posts : 319
Join date : 2021-09-24
These are the smallest peristaltic pumps I can find. They work, but they are very slow so I just use it for the trim tank now, but it can dive with it if you're not in a hurry.
https://www.aliexpress.com/item/1005005336619812.html
another option is to use a pair of diaphragm pumps with T connections so one is for sucking in and one for blowing out.
https://www.aliexpress.com/item/1005005336619812.html
another option is to use a pair of diaphragm pumps with T connections so one is for sucking in and one for blowing out.
david f likes this post
Michaelc- Posts : 32
Join date : 2021-04-22
- Post n°4
Thanks
Thanks, I did find a pump that works. It's a bit slow but I believe it will do the job. I have found that the original pump was a brass steam driven piston pump for model boats. Something know longer made
david f- AMS Treasurer
- Posts : 2411
Join date : 2010-11-10
Age : 74
Location : Cumbria
If you read my build log (I gave you a reference in earlier post) you will see the original pump.
(They were not very good. Slow and they leaked and so pressurised the WTC.)
David
(They were not very good. Slow and they leaked and so pressurised the WTC.)
David
Michaelc- Posts : 32
Join date : 2021-04-22
- Post n°6
In answer
Hi, I did read your original post. Did you keep the original pump or update it?.
Deep Diver (Fred)- AMS member
- Posts : 270
Join date : 2010-11-07
Age : 76
Location : Peacehaven East Sussex
- Post n°7
Darnell Pump
Hi Michaelc
I have a pump sitting on my desk, I also have the kidney bags that were used in the boats.
Fred
I have a pump sitting on my desk, I also have the kidney bags that were used in the boats.
Fred
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