Here goes...some questions

[Thorbrandr]

Hi!

I'm new into subs, and all my limited RC air time has been with foam electrics on 2.4 GHz...so I have a few questions here:

1. What kind of range should I expect out of a 75 MHz radio for a submerged sub?
2. Is the range comparable between a VEX and a Futaba transmitter?
3. Where is the community hiding the 75 MHz Futaba modules????
4. Has anyone had issues with large fish going after a sub? Most of the local lakes and ponds I am looking at have Northern Pike.

I have a RTR coming so I can get some practical experience while I build my own.

Thanks!

[He Who Shall Not Be Named]

Fresh meat!!!!!....

[rwtdiver]

Hi!

I'm new into subs, and all my limited RC air time has been with foam electrics on 2.4 GHz...so I have a few questions here:

1. What kind of range should I expect out of a 75 MHz radio for a submerged sub?
2. Is the range comparable between a VEX and a Futaba transmitter?
3. Where is the community hiding the 75 MHz Futaba modules????
4. Has anyone had issues with large fish going after a sub? Most of the local lakes and ponds I am looking at have Northern Pike.

I have a RTR coming so I can get some practical experience while I build my own.

Thanks!

Welcome aboard Chris!

I see David M. has answered the call! He is the best, and I am sure he is working on your questions with highly detailed answers!!:-))

What is the RTR sub that you currently have?

Rob
"Firemen can stand the heat"

[Thorbrandr]

Welcome aboard Chris!

I see David M. has answered the call! He is the best, and I am sure he is working on your questions with highly detailed answers!!:-))

What is the RTR sub that you currently have?

Rob
"Firemen can stand the heat"

An OTW R-class is out for build. Big boat to start with, but it is the same scale that I want to work, and it is WWI. It will be a bit before I will be ready to be running. In the mean time I am doing a bit of research.

Chris

[Das Boot]

75 MHz is much gone. What’s left is sparse and rather high in price. 72 MHz is an alternative. It’s been replaced by 2.4 GHz. 75/72 MHz will go farther than you’ll want to go with a sub, so that is moot. Good luck finding any 75 MHz modules. Never heard of fish attacks, but I have heard of octopus going after Seaview’s.

[He Who Shall Not Be Named]

Hi!

I'm new into subs, and all my limited RC air time has been with foam electrics on 2.4 GHz...so I have a few questions here:

1. What kind of range should I expect out of a 75 MHz radio for a submerged sub?
2. Is the range comparable between a VEX and a Futaba transmitter?
3. Where is the community hiding the 75 MHz Futaba modules????
4. Has anyone had issues with large fish going after a sub? Most of the local lakes and ponds I am looking at have Northern Pike.

I have a RTR coming so I can get some practical experience while I build my own.

Thanks!

Can you make the Texas Trim Party this month? I'll be there and will give you some pointers.

[Thorbrandr]

Can you make the Texas Trim Party this month? I'll be there and will give you some pointers.

I am afraid that I can not make that event. Still finishing up a cross country move and getting setup in a new place.

[Thorbrandr]

75 MHz is much gone. What’s left is sparse and rather high in price. 72 MHz is an alternative. It’s been replaced by 2.4 GHz. 75/72 MHz will go farther than you’ll want to go with a sub, so that is moot. Good luck finding any 75 MHz modules. Never heard of fish attacks, but I have heard of octopus going after Seaview’s.

Been seeing that issue on cost. Have scored some radio hardware. Trying to stay legal on 72 vs 75 MHz, but not afraid of getting a license for the longer wavelengths. Don't have a Seaview, so not worried on the Octopi. Have had a Scuba certified friend in the area step up for recovery....probably looking forward to the possibility.

[Das Boot]

Been seeing that issue on cost. Have scored some radio hardware. Trying to stay legal on 72 vs 75 MHz, but not afraid of getting a license for the longer wavelengths. Don't have a Seaview, so not worried on the Octopi. Have had a Scuba certified friend in the area step up for recovery....probably looking forward to the possibility.

Don’t see going to radio prison for using 72. Besides, how many rc planes run in pools or ponds. The spectrum is antiquated since 2.4 came out. I know of no one still using it.

[trout]

So, let us take your questions one by one.
1. Too many variables. Placement of antenna, general internal construction (noisy or not), and water conditions all contribute to distance. Unless you have gin clear water to run in most run at periscope depth. At that shallow of a depth, you can get pretty far out, but usually a pucker factor comes into play. We tend to stay closer to shore. I know of gentlemen that run their subs 15-20' deep because the water is so clear they can see the sub and I have run in waters that 30' out and 2' down it will surface because of particulates in the water.
2. No idea on differences, again the pucker factor kicks in usually before the radio goes out of range.
3. I am not telling you where I hide my stash, it is my retirement LOL. They pop up now and then. Just keep watching the postings for those selling.
4. I have not, but there was a video 10+ years ago that someone took of a Pike or similar fish hitting the sub. It can happen, but not very often. Prove me wrong on this, please (with video - LOL)
I like your idea of practical experience. The sub you get you will need to learn to tear it apart and reassemble. Wear and tear happens. Look forward to your posting more.
Peace,
Tom

[Thorbrandr]

So, let us take your questions one by one.
1. Too many variables. Placement of antenna, general internal construction (noisy or not), and water conditions all contribute to distance. Unless you have gin clear water to run in most run at periscope depth. At that shallow of a depth, you can get pretty far out, but usually a pucker factor comes into play. We tend to stay closer to shore. I know of gentlemen that run their subs 15-20' deep because the water is so clear they can see the sub and I have run in waters that 30' out and 2' down it will surface because of particulates in the water.
2. No idea on differences, again the pucker factor kicks in usually before the radio goes out of range.
3. I am not telling you where I hide my stash, it is my retirement LOL. They pop up now and then. Just keep watching the postings for those selling.
4. I have not, but there was a video 10+ years ago that someone took of a Pike or similar fish hitting the sub. It can happen, but not very often. Prove me wrong on this, please (with video - LOL)
I like your idea of practical experience. The sub you get you will need to learn to tear it apart and reassemble. Wear and tear happens. Look forward to your posting more.
Peace,
Tom

Thanks Tom!

I work comms design on slightly larger scales. I have used the “it depends” answer on range. The pucker factor is a chief engineer’s rule of margin. Engineers always hide margin. What I am hearing is that the practical range is good for what I want.

I have been told that the local Pikes leave swimmers, including small children, alone. My friends have already asked me to run a camera, so who knows…

Chris

[trout]

I have been told that the local Pikes leave swimmers, including small children, alone. My friends have already asked me to run a camera, so who knows�

Chris

Ooooh, a rear facing camera showing a Pike attacking would be really cool! We have several people that run in Pike populated waters and do not have issues. The important thing is just get your sub running and not go for extremes. Frequently I share the "Crawl, walk, run" statement with people building their first sub, it was taught to me that way, since you are getting an RTR, I will still share it. The mind can think of all the fun things you can do with a sub, but you need to get the experience in. I suggest, you keep your sub close to shore and you will need to learn maintenance on it. Only after a few runs not a couple, few, then you will go further out. Do not push your luck. Unless you can afford to replace that sub and money means nothing to you.

[wlambing]

Up this way, Largemouth Bass and Pickerel like to get quite inquisitive. Have never seen any actual hits, but I 'spose there's always a chance!