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IC or Electric for Ripmax DeHavilland Tiger Moth

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Neil6709/09/2019 14:13:02
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188 forum posts
3 photos

I was given a Ripmax DeHavilland Tiger Moth for free from a club member who trying to reduce models he will never fly.

Recommendations on power options would be appreciated. The model seems to be designed for a small IC with a wooden structure protruding from the firewall. Electric looks trickier as need to set up sort of mount in a very small space due to propellor apperture being right at the top of the cowl. Any advice and specs welcomed.

tiger moth 1.jpg

tiger moth 2.jpg

I think I read it suffers from adverse yaw but thought I might fit a rudder gyro.

Frank Skilbeck09/09/2019 14:29:52
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4498 forum posts
101 photos

There's an electric one flying here looks like it flies very nice.

Rudder gyro might not be the correct solution, but lots of aileron differential would help (similar to the full size) and initiating turns with the rudder. All part of the appeal of flying a scale model.

Martin Harris09/09/2019 14:31:58
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8890 forum posts
221 photos

I've yet to see an electric powered full sized Tiggie. It's your choice but mine would be a nice 4 stroke glow mounted inverted. (I know the full size doesn't use glow fuel but the question doesn't specify fuel type!)

john stones 109/09/2019 14:40:07
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10715 forum posts
1480 photos

Inverted 4 stroke, incoming. wink

Jon - Laser Engines09/09/2019 14:59:54
4848 forum posts
180 photos

what is the span/weight? i had a perkins/green air 50 odd inch tiger moth some years ago and it flew really well on a 30 4 stroke. As there are not many 4 strokes that size any more you might have to electrocute it

Trevor Crook09/09/2019 17:09:50
869 forum posts
65 photos

I had the DB one many years ago and it flew very nicely with an OS48 Surpass. The model concerned looks about the same size. I'm all electric now so would suggest a 500W leccy setup. Could be challenging making an accessable battery bay though.

As said above, a gyro won't sort the adverse yaw. Loads of aileron differential together with rudder for turns. I'm afraid I cheat with that type of model and use the CAR function in the Tx!

Solly09/09/2019 17:12:25
241 forum posts
1 photos

Provided you don't mind getting some oil on your model, use a four stroke engine. To me there's nothing worse than a lovely scale biplane doing a slow flypast sounding like a vacuum cleaner.

Neil6709/09/2019 18:55:31
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188 forum posts
3 photos

Thanks for the feedback. The wingspan is 50 inches but the model is quite light with a covering that appears a bit plastic.

Neil6709/09/2019 18:59:58
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188 forum posts
3 photos

Thanks for the feedback. The wingspan is 50 inches but the model is quite light with a covering that appears a bit plastic. Similarly to Solly's comment "its another Dyson" can be heard at our club. Other makes are available.

paul d09/09/2019 20:54:48
70 forum posts
5 photos

You could always fit a diesel, a paw 35 would power that wonderfully, nice compact silencer as well and you can get them new for a reasonable price.

Geoff Sleath09/09/2019 21:41:39
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3440 forum posts
304 photos

Personally I'd always go for electric power if only for the reliability, cleanliness and convenience but it's a totally personal choice.

Both my 58" ws DB Moths (Tiger and Gypsy/Cirrus) turn perfectly well on aileron alone with lots of aileron differential - probably twice as much up as down. I do feed in some rudder sometimes if I'm feeling clever but it's not necessary.

Geoff

Mark Stevens 110/09/2019 01:16:51
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127 forum posts
48 photos
Posted by paul d on 09/09/2019 20:54:48:

You could always fit a diesel, a paw 35 would power that wonderfully, nice compact silencer as well and you can get them new for a reasonable price.

+1 on that for the diesel - you also won't have a huge silencer sticking out spoiling the looks as they are very compact on PAW's

Mark

cymaz10/09/2019 06:39:36
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8767 forum posts
1190 photos

Four stroke, and with some creativity an exhaust stub out of the bottom of the cowl as per full scale

Trevor Crook10/09/2019 06:53:14
869 forum posts
65 photos

Is it just the photos, or does the lower wing have less span than the upper?

Denis Watkins10/09/2019 07:00:43
3914 forum posts
61 photos
Posted by Trevor Crook on 10/09/2019 06:53:14:

Is it just the photos, or does the lower wing have less span than the upper?

We have two of these models at the field Trevor on SC30FS,

And you are right about the " illusion "

The wings are equal span

Edited By Denis Watkins on 10/09/2019 07:02:31

Neil6710/09/2019 12:24:10
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188 forum posts
3 photos

Trevor and Denis, I agree photo looks as if there is a difference, had to go and check myself! But Denis is correct they are equal. A SC 30 FS sounds good.

Martin Harris10/09/2019 13:53:03
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8890 forum posts
221 photos

At one time, the importer for Airsail kits was able to supply a pipe for their Chipmunk which would achieve Cymaz's suggestion - the engine and cowling arrangement is very similar of course. IIRC Kevin B. on this forum was involved with someone restarting production of Airsail kits so he might possibly be able to assist?

Jon - Laser Engines10/09/2019 14:07:16
4848 forum posts
180 photos

If you go for the 30fs then use the biggest prop you can but with a fine pitch. I think i used 11x5 but i cant remember as it was a while ago.

Nigel R10/09/2019 15:47:14
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3114 forum posts
479 photos

OS 40 FS, either the original or the Surpass version, seem to go for between £50 - £100 on ebay and are listed quite regularly.

Martin Harris10/09/2019 16:57:38
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8890 forum posts
221 photos

My gut feeling is that a 40 might suit the model better than a 30? So much better than adding lead if it needs some nose weight!

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