Gotcha!
I know it as 'Hareesa' in Morocco, Algeria and Tunisia. Or 'Revani' in Turkey👍
The Rose Water points to the Turkish variant. Delicious😛, but I always feel a drive to clean my teeth after eating it 😮
You were right about the 'A' & 'E' anyway, depending on variant 😉
I think we still have a 'Non Hobby Chit Chat' section somewhere on the Forum page. I'll check.
Cheers, and Guten Appetit! Doug
PS Yes the section is still there. Now called simply Non-Hobby Chat.

Not sure of the exact recipe Doug, saw it on TV on some travel program and didn't get time to write it down. It has semolina, sugar, flour, coconut and rose water and sugar syrup as a finishing 'sauce'. It's made into a dough after simmering the semolina, mixing a truckload of sugar, adding coconut, flour, putting in a shallow tray and baking at around 150c for about 40 mins. After its done add another truckload of sugar to water, simmer till dissolved, add rose water and pour all over cake/slab. I've tried small quantities and although as previously described still tastes quite reasonable.
Better call it 'ships ballast cake' so we are not accused of misusing the site. As an international traveler you might recognize it being a common Arab sweet. Will try and hunt out the name (think it had an A and E init) Here endeth the cooking lesson.
Just found it! called Basboosa

"It's thick, pliable, sticky and heavy, ..."
And probably extremely sweet as well 😛😝
Sounds like a typical 'sweetmeat' to be found all over the Arab world and Turkey etc.
Can you send me the recipe please?

You think that's heavy Martin, you should try my cake!

Or fishing up the sub if it fails to blow ballast Doug, and talking of ballast, I've just had a crack at making a middle eastern coconut and semolina cake. It's thick, pliable, sticky and heavy,- just right for molding into the bottom of your sub, or for any thing requiring moldable ballast.

Hi Doug,
Getting a bit heavy for a simple guy like me, I just want to make models LOL!!

Martin.

Hi JB,
Comes from 30 odd years of designing COMMS systems for naval vessels, including submarines.
Did several surveys of submarines for refit designs.
At 6'2" I'm not built for working on subs, kept bangin' me 'ead! 💥😭🤕

Martin,
whales have the advantage that they are transmitting directly into water, where sound travels about 4 times faster than in air at sea level. And they can do this mechanically, process still not fully understood, at very low frequencies from around 2Hz to 100Hz mostly. Hence the long ranges achieved.
Up to maybe 24kHz for short range echolocation - nosh hunting!😜
Interestingly, spectrum analysis of Humpback whale sounds shows an FM type structure with pulsed modulation. Just like our FM RC transmitters! 😮

We have to transmit first through the air, for several thousand kilometres in some cases, and then have enough energy left to penetrate down a hundred metres or so.
We have to do this electrically, hence long antennas. Wavelength = Speed of light / frequency in Hertz! Do the math - it's a long chunka wire!😮 Halfwave at 8kHz ~18.75km.
Happy whale listening folks,😎
PS; JB, you can always use the antenna for a spot of fly fishing - while waiting for your sub to come up again!😮

Very interesting thanks Doug, you obviously know your stuff, - one of those things I've always wanted to know but was afraid to ask, HyHy At least 40 still has a use here and there, but I doubt whether I'll be building any subs in the near future to suit my old TXs, although I did contemplate it a few years ago. Also those dammed aerials are a pain! Those Graupner tray sets are ridiculous! Maybe I can get my old Yaesu Frog 7 out and listen for subs?

Mother nature has always been at least one step ahead of us Martin! 😉

Low frequency whale sounds with no long antenna LOL!

Hi JB,
At 2.4Gig some is reflected and some refracted into the water but is then rapidly absorbed through heating the water molecules. Just like your Microwave oven which works in the same frequency band. So don't take your microwave down to the lake with you to warm up your lunch!!😂

The absorption rate (and hence depth penetration) is a function of the wavelength and salinity of the water. The shorter the wavelength (= higher frequency) the higher the absorption and inverse. That's why real naval subs use the VLF (Very Low Frequency) band to receive their orders when at depth. Frequencies used are around 8kHz or less so they can only receive very low data rate signals, more seconds or even minutes per byte rather than the MBytes/sec we are used to!!
They can't transmit an acknowledgement as the TX antennas used are kilometres long at these frequencies!

At the depths model subs (intentionally!) reach, ca 1 to 2meters, 40MHz is OK, 27MHz gives a slightly stronger signal at the same depth.
The modulation itself also having an effect; due to the fact that FM signals have a constant amplitude (peak to peak voltage) whereas AM has an amplitude which goes up and down with the modulating signal (pulse train) as the name implies. Thus the FM receiver has more signal voltage to work with.
Here endeth today's lecture 😉 Anyone still awake?💤💤
Cheers, Doug 😎

Interesting, does the higher freq bounce off the water ? I know 2.4 doesn't like going behind buildings the same as 40mhz. I have 2 Futaba 6ch and 1 Acoms 6ch FM sets sitting in a cupboard I haven't used for about 8 years (got sick of all the mucking about with crystals) Still have my old Futaba 'brown box' AM 6ch from 1976 (still works perfectly but wouldn't risk a model to it) How's AM in water?

Agreed JB 👍
but I still use my 40Meg set for subs cos 2.4Gig don't woik underwater🤔
Cheers, Doug 😎

As Doug said, ditch the AM radio, prone to just about any interference these days. This is pre FM (which better and is still used by some in more remote interference free locations but is still prone to interference, plus you need to change frequencies TX and RX) with both of these sets if another person is using the frequency you have). This means either waiting for a frequency to become free (and making sure no one is on your frequency so you don't destroy someones model) or having a number of pairs of frequency crystals to change to, plus having to use a frequency peg board at clubs. Buy a modern 4 or 6 channel transmitter on 2.4G and you won't have to worry about all of that. 27Mhz -on (AM) 40Mhz -on(FM) is 40 yr old technology really

Hi Gren, You might be in luck!
That's a 27MHz AM TX.
https://aucview.aucfan.com/yahoo/r325252598/
Can only find it on web pages in Chinese ☹️
But the pics show what it is.
This might match the 27Meg RX that you have IF THE CRYSTALS MATCH, i.e. they are both for the same channel frequency. This should be marked on the side of the crystals.

But remember; even if it works you may be plagued with interference problems, some caused by the boat's own on-board equipment, especially sparks from the motors if they are the two wire brushed type.
Make sure that they are properly suppressed with capacitors. As in attached pic. The numbers in brackets are the value codes printed on the capacitors.
Most model shops will have these in sets, as per the Krick set in the pic.
Other interference sources can be CB radios; 27Mhz Citizens Band such as truckers still use.
Good luck🤞 Cheers, Doug 😎

Hello again,
I was donated this transmitter and wondered if it would be any good and can i get a receiver to match it. I have no idea how to know which is receiver is compatible.
Thanks
Gren

Thank you so much thats really helpful. I shall look purchase both the above that you recommend.
Thanks
Gren👍

Excellent suggestion TG 👍
I use the German branded version of this system and it works perfectly.
You only have to first dump or overwrite all the default aircraft/heli presets!

Gren: dump the 27MHz receiver.
Your chances of finding a matching transmitter are remote. And the 27MHz band is prone to severe interference anyway 🤔
Cheers, Doug
Oh! BTW: Welcome aboard 👍

Here is a new transmitter and receiver that will work for you. It has a few extra channels that you dont need.


https://www.ebay.co.uk/itm/Flysky-FS-i6X-2-4G-6CH-RC-Transmitter-With-FS-iA6B-RX-for-RC-Car-Boat-in-stock/292884688293?hash=item443149ada5:g:8jMAAOSwclxcuT5z

I run sailboats all the time. For the battery pack you can use a 6v hump pack. Here is one with a charger. (you dont need the switch)( I'm in the US so I dont use the UK Ebay site much.

https://www.ebay.co.uk/itm/Modelsport-UK-6v-Receiver-Battery-and-Charger-Pack-Hump-Pack-MSRXNP/253828164657?hash=item3b19566c31:g:s88AAOSwAlJbfoYD

For the transmitter, there are 2 ways to go. 1st is to use the existing older frequency receiver that you have and try to find a compatible transmitter, or just get a new transmitter and receiver combo.