Another 2 stroke to 4 stroke question please
07-09-2022 | 12:32 PM
#26
I never make claims like "the fuel savings will pay for bla-bla " or whatever. To say it was a stark misrepresentation is in itself a blatant , oportunistIf you have methanol available however, methanol fuel does remain an option. With the timing properly set and no nitromethane-straight methanol/oil fuel you will indeed see a good 20% increase in power. You can maintain that power level for the entire flight without taking cool down breaks. Your idle and transition will be excellent.
You will burn methanol at close to twice the rate of gasoline.
You will burn methanol at close to twice the rate of gasoline.
Last edited by 2W0EPI; 07-09-2022 at 12:38 PM.
07-09-2022 | 01:30 PM
#27
I have thought about it because I can buy 4.55l English gallon of pure methanol for around £12.00 in contrast to this 5% nitro(1 gallon) cost me £25.99. You can buy caster oil in 1l bottles, so you can mix and match the various additives?, like caster and methanol and add 500ml of 25% nitro fuel. etc.?
Here,depending on where I buy, methanol runs around $2.50/gallon.
The Klotz oil about $45/gallon.
Of course that $2.50/gallon is a regional price but pretty exceptional.
If you are running spark ignition, you can easily omit the nitromethane. That not only cuts fuel cost but diminshes consumption as well.
BTW, Gasoline today costs around $5.00 per gallon, premium quite a bit more.
I just bought 10 RCexl CDI units for $55.00 each with Hall sensor and plug included. Not sure what they cost there but if $55 works for you, sending one would be no problem.
Still most likely, for that plane, gasoline is a very viable choice.
Good luck.
BTW,
Around here the Methanol fueled FA-82 is selling at $350. The gasoline version, the FG-14 will cost closer to $430. .... Apples to apples...
I am fairly unfamiliar with current prices as 99% of my engine purchases are used/basket cases, in need of repairs
Could probably get them cheaper buying new LOLBut look at all the fun!
Last edited by Jesse Open; 07-09-2022 at 01:48 PM.
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2W0EPI (07-09-2022)
07-09-2022 | 02:27 PM
#28
Having spent sometime on choosing my engine I decided to buy another brand new Force .46cu,in nitro glow engine, as a spare because a new piston and sleeve would set you back £60, a complete brand new engine is costing £90, so I've ordered two engines, one to use/fly and the other for spare parts
07-09-2022 | 02:46 PM
#29
Having spent sometime on choosing my engine I decided to buy another brand new Force .46cu,in nitro glow engine, as a spare because a new piston and sleeve would set you back £60, a complete brand new engine is costing £90, so I've ordered two engines, one to use/fly and the other for spare parts
Have fun!
PS: I assume you bought it from JustEngines? Good supplier, excellent service, I was a very frequent customer there until Brexit happened.
07-09-2022 | 04:54 PM
#30
This comment:
Was a response to this posting:
Not about your questions, Sorry
Yes exactly, as intended. The comment pertained directly and only to the cost of converting two basically similar engines.
In that case, a perfectly good example.
The comment was not about the cheapest route possible.
I really tried searching for an answer to this, but topics that come up seem to go sideways after 6-10 posts and no real answer comes from it.
So to explain what I am looking into is an engine to fly a Top Flite SE5a.
Plane has a 53" span and is around 1,000 square inch wing area.
Dave Platt designed it back in the late 60's or early 70's when .60 engines were loop scavenged. Most notable were the K&B 61. Webra .61, OS 60 and Super Tigre 60 engines that were quite powerful for their time.
I am pretty much decided on the OS FSa 72II 4 stroke mainly because it fits under the cowl...............Yes I know the price is absurd, but this will be one of the last 5 planes I build and fly as I am 67 now and just don't see letting cost ruin my funAttachment 2271977
I also haven't been active in RC since 2012 so I do not know how much power modern 4 strokes put out these days.
Am I at least on the right runway with thinking the OS 72 will have the power needed to fly this plane vs an old 2 stroke 60 of the time era?
Really appreciate any input you all might be willing to share,
Mike
So to explain what I am looking into is an engine to fly a Top Flite SE5a.
Plane has a 53" span and is around 1,000 square inch wing area.
Dave Platt designed it back in the late 60's or early 70's when .60 engines were loop scavenged. Most notable were the K&B 61. Webra .61, OS 60 and Super Tigre 60 engines that were quite powerful for their time.
I am pretty much decided on the OS FSa 72II 4 stroke mainly because it fits under the cowl...............Yes I know the price is absurd, but this will be one of the last 5 planes I build and fly as I am 67 now and just don't see letting cost ruin my funAttachment 2271977
I also haven't been active in RC since 2012 so I do not know how much power modern 4 strokes put out these days.
Am I at least on the right runway with thinking the OS 72 will have the power needed to fly this plane vs an old 2 stroke 60 of the time era?
Really appreciate any input you all might be willing to share,
Mike
In that case, a perfectly good example.
The comment was not about the cheapest route possible.
Last edited by Jesse Open; 07-09-2022 at 05:03 PM.
