Laser 80 compared to a Saito 100

[Rocker]

I have a Laser 80 installed in a Seagull DH 60 Moth,or rather I did have  .My old DX6 malfunction and lost signal.RIP.Gipsey Moth .Bined the DX 6 

Just order a new Seagull DH 60 Moth

My question to all you ic experts out there is. The good old Laser 80.flew the Moth very scale like but only had just enough power for it. Thinking of getting a Saito 100 ( would of gone for a Laser 100 but hey all good things come to a end ).Will putting in a Satio 100 has to a Laser 80 make much difference in power (will the Saito 100 make a difference or will it not make much difference and in that case just keep the Laser 80

I would like a bit more power then I had with the Laser 80,not much more but just a bit more power .So it will loop.with out having to dive to pick up enough power to loop the Moth (yes I know the full size had to do that but I like a bit of power in reserve .I do not have to use it but it us there if needed.So the question is do I buy a new Satio 100 or just keep the Laser 80.???  

[Jonathan M]

Spec says 90 two-str or 120 four-str, but you obviously flew the old one happily on the Laser 80... in a scale sort of way.

Does a Laser of any given capacity produce demonstrably more power compared to an equivalent from OS, Saito, ASP, etc?  I don't know... but have just ordered a Smooth Operator kit, for which I've got a Laser 80 or an ASP 91.  I'm guessing the Laser will probably manage, but again the 91 is at the bottom end of the recommended 4-str range of 90-120.

 

Sorry to hear of the Moth's demise.  Coincidentally my old (but new at the time) DX7 was responsible for the loss of my 4-str Acrowot and 4s Wot4, both within a couple of weeks!  In my case, after getting it back with a new RF board from the service agent then watching it fail to control a slope soarer for several seconds(!), I gave it away for free but with a warning to the recipient.  That was 5yrs ago, been happily using FrSky ever since.

 

Edited August 21 by Jonathan M

[Paul De Tourtoulon]

I have 2 Saito 100's, and a couple of lasers, the Saito will probably give you around 30% more power, they are fantastic engines, 'however', I did get one of mine second hand that threw props, so I shimmed the cylinder.

[extra slim]

The Saito is circa 3oz lighter, will give you an increased performance, but depends what you are after. If you need the weight up front and are happy with the performance of before then I'd carry on. If I wanted a little extra margin, I would go Saito no doubts. I have loads (and a few lasers) and they are super engines, and IMO are more straightforward to install, (less critical on carb and tank position, and less/smaller holes in the cowl!!)..

[Ron Gray]

Personally, if you want to fly it in a scale like manner (and why wouldn’t you, it’s a scale model) then stick with the Laser. You have to ask yourself why do you want more power? Learn to fly it like the full size and you don’t need the extra power, far too many scale models are flown (imo) much too fast (look at my latest Hurricane vid!) but if that’s your thing buy the Saito.

[Engine Doctor]

2 hours ago, Rocker said:

I have a Laser 80 installed in a Seagull DH 60 Moth,or rather I did have  .My old DX6 malfunction and lost signal.RIP.Gipsey Moth .Bined the DX 6 

Just order a new Seagull DH 60 Moth

My question to all you ic experts out there is. The good old Laser 80.flew the Moth very scale like but only had just enough power for it. Thinking of getting a Saito 100 ( would of gone for a Laser 100 but hey all good things come to a end ).Will putting in a Satio 100 has to a Laser 80 make much difference in power (will the Saito 100 make a difference or will it not make much difference and in that case just keep the Laser 80

I would like a bit more power then I had with the Laser 80,not much more but just a bit more power .So it will loop.with out having to dive to pick up enough power to loop the Moth (yes I know the full size had to do that but I like a bit of power in reserve .I do not have to use it but it us there if needed.So the question is do I buy a new Satio 100 or just keep the Laser 80.???  

Hi Rocker . I have a new in box Laser 100 . Its been mounted in a model but never had fuel in it . I'm loath to put on the Classifieds as they seem to attract  thieves and rouges these days . Scammers is a too nice a word fot these low life  . Its a pity as the honest modellers miss out on stuff for sale .

If you live in the south east you can collect if interested . I will be going to Headcorn Southern Model show at the end of the month on the Saturday . PM me if interested

[Tim Flyer]

The Laser 100 has plenty of power and lots more than the Laser 80. I use a Laser 100in my “20cc” Seagul P47 and it flies that really well on a 15x7 prop. The Laser 80 usually runs a 14x6 so has far less grunt.

 

There is a big difference with the Laser 100 in that it is a long stroke engine and turns relatively big props with authority. It’s like a “mini 180” in character. I think your Moth would be very happy with it! 

Edited August 21 by Tim Flyer

[Jon H]

The 80 should have walked it. What prop were you swinging?

[Rocker]

On 21/08/2024 at 18:53, Jon H said:

The 80 should have walked it. What prop were you swinging?

14x6 APC 

[Don Fry]

I’ve got a couple of these, I’d say a bit small.

15/6 for a bit more grunt, 14/7 for a bit more speed.

[Jon H]

15x6 would be my choice for a model like that

[Rocker]

So what would a 15x6 prop.give me over a 14x6 prop.IE what extra would the  15x6 give me over the 14x6 prop ?

Edited August 24 by Rocker

[Paul De Tourtoulon]

An extra inch,,,😅

[Jon H]

1 hour ago, Rocker said:

So what would a 15x6 prop.give me over a 14x6 prop.IE what extra would the  15x6 give me over the 14x6 prop ?

 

more blade area gives more thrust, and biplanes have high drag so thrust is more important than pitch speed. 

 

1 hour ago, Paul De Tourtoulon said:

An extra inch,,,😅

 

it can make all the difference apparently. 

[Rocker]

I did try a 15x6 on the DH Moth before the trouble with the DX6 .I can not recall it made that much difference. Order a new DH 60  (due in the end if September,which means October ).Thought I play it safe and install a Satio 100 .I can always throttle back .You do not have to fly at full throttle but the power will be there should I need it .That is what the throttle is there for I can fly it around on a third throttle and if  I need more power it will be there .With the Laser 80 I had to fly it  around on almost full throttle with nothing in reserve 

[Geoff S]

16 hours ago, Rocker said:

So what would a 15x6 prop.give me over a 14x6 prop.IE what extra would the  15x6 give me over the 14x6 prop ?

 

Wen I first got interested in aeromodelling and electric propulsion (in the days of NiCad and heavy, brushed motors) I got the idea of trying to understand how props compared by determining the volume of air moved/revolution.  Assuming 100% efficiency it's simply the area of the propeller arc (pi x 0.5 length squared) multiplied by the pitch. Of course it's much more complicated than that, as I eventually realised in my ignorance, but it works to compare props and I still use it occasionally.  I even (futilely) worked out the mass of air 🙂

 

Thus for a 15x6 prop the volume/rev is 1060 cu ins and a 14x6 is 924 cu ins so (to a first approximation) there'll be 10% more thrust from the bigger prop at the same rpm.

[Rocker]

17 minutes ago, Geoff S said:

 

Wen I first got interested in aeromodelling and electric propulsion (in the days of NiCad and heavy, brushed motors) I got the idea of trying to understand how props compared by determining the volume of air moved/revolution.  Assuming 100% efficiency it's simply the area of the propeller arc (pi x 0.5 length squared) multiplied by the pitch. Of course it's much more complicated than that, as I eventually realised in my ignorance, but it works to compare props and I still use it occasionally.  I even (futilely) worked out the mass of air 🙂

 

Thus for a 15x6 prop the volume/rev is 1060 cu ins and a 14x6 is 924 cu ins so (to a first approximation) there'll be 10% more thrust from the bigger prop at the same rpm.

That is very interesting Geoff .Thanks

[Paul De Tourtoulon]

It isn't that simple, where does your engine give the most power, torque, plane weight, drag and flying speed, what speed do you

want to fly, and the différance in Apc, master air screw, Graupner etc props makes a lot of difference, I was taught to suck it and see !.

 

 More power = less problems, that's what throttles are for.

[Rocker]

This is getting to technical for me .Think I stick to the Satio 100 .Problem solved 

[Jon H]

1 hour ago, Rocker said:

This is getting to technical for me .Think I stick to the Satio 100 .Problem solved 

 

There are still unfinished laser 100's at the factory which will be finished and sent to msl. Might be worth checking in with them if you are interested and not already set on the saito. 

 

I am very surprised the 80 isnt man enough for the job though. 

 

2 hours ago, Paul De Tourtoulon said:

the différance in Apc, master air screw, Graupner etc props makes a lot of difference

 

master airscrew props are pretty rubbish

[Chris Walby]

6 hours ago, Jon H said:

 

There are still unfinished laser 100's at the factory which will be finished and sent to msl. Might be worth checking in with them if you are interested and not already set on the saito. 

 

I am very surprised the 80 isnt man enough for the job though. 

 

 

master airscrew props are pretty rubbish

I concur with Masr Airscrew, noisy and don't shift air very well, stick an APC on and it will make a noticeable difference, that and the prop Jon suggested should make the difference you are looking for. Buy the 100 and look for a model to put it in as well!

[john stones 1 - Moderator]

Can only see one question, will the Saito 100 have more power ? Answer appears to be Yes.

Agree with the M.A comments.

Nice model by the way, there's one on FB at present and I'm tempted, would be a 20cc petrol for me.