Daniel Holmes

Hello Chris & Geoff Just finished my Sig 1/4 Scale cub yippee.  Finished but not flow, I powered it with an Os 120 Gemini Flat Twin for proper scale appearance and it does look and sounded the business.  It remains not flown primarily due to an engine seizer on set up so I am waiting for a OS 160 Gemini to arrive from the US as the Gemini mark 1 is obsolete and I am unable to obtain parts.My advice would be study the plans really well as some of the steps are not mentioned in the instruction book.  I used the method mention with the kit for the wing struts but it is a little fiddly and I can imagine loosing screws in the field!  On hindsight I would redesign the struts with swivels and quick release attachments to make life easier.They supply 4-40 bolts and captive nuts with the kit which you can source but again I would substitute these for metric before sealing them inside wings etc, just to make life easier and cheaper.I found the hardest part of the kit was getting a good finish when the glass cloth and resign/epoxy is used on the struts and under carriage, as a coat of paint doesn't hide lumpy resign so a lot of care in those crucial minutes saves sanding and filling.  If you are gifted in the glassing department you won’t suffer the hours of finishing I did! I covered the model in white Solartex and then sprayed a red and white starburst design before transfers and lacquer, she looks the business.  C of G is spot on from the building board.The list goes on but any questions give me a shout.Good luck Regards Dan

My Grandpa during the second world war maintained the Mosquitos years ago, so I would like to have ago at a giant!  Looking at building a 1/4,1/5 or 1/6 scale Mosquito.  Would like to use construction techniques as near to the original as possible,  plywood and madaplin!  Has any one built one? Can you recommend any Plans?  Regards,  Dan.

David, Thank you, there sounds like a glimmer of hope!   please contact me on   /forum/smilies/big_smile_smiley.gif[/img][email protected]][email protected] Many thanks Dan

Yes hopefully if any one out there has a duralumin  conrod for an OS 120 FT Gemini please get in touch!!   Looking more likely if any one needs some parts to repair a Gemini mark 1 get in touch!!

I received this message from OS with a list of useful contacts for anyone in similar circumstances.  Thanks for your inquiry. Unfortunately, the Gemini II connecting rods will not work on the Gemini I.  You can try one of the following sources, but we are not sure if they ship internationally. These gentlemen rebuild old motors and stock large quantities of older engine parts.  They may be able to assist you: 1) Preferred means of contact: /forum/smilies/tongue_out_smiley.gif[/img][email protected]][email protected] Pete's Hobbies 1814 Nelson SE Grand Rapids MI 49507 Phone 616-245-3106 Phone calls will be greeted with an answering machine. Please leave Name, Ph No. and, preferably, what you are looking for.  There may be as much as a one week delay in response time due to extensive travel to shows, swap meets, and FLYING TIME! 2) Model Airplane Engines- Antique to current, to use, to get out of production parts off of, or general purpose. 1200 Engines on My list - Buy- sell-Trade! send 37 cent stamp to get free list. Contact: Bob Boumstein/ HWC PO Box 94 Boystown NE. 68010 E-mail : [email protected] Fax 24hours : 402-334-4173 Phone: WEEKENDS ONLY 402-334-0122 (messages returned on Sunday only!) No calls before 9AM CST or after 9PM CST 3) Gene Steinkamp (This gentleman was the engine man for World Engines.) 8773 Russet Drive Cincinnati, OH 45251 513 385 7398 4) PISTON RINGS ONLY: For discontinued piston rings, try contacting Frank Bowman. He manufactures repro and current piston rings for our modeling needs. He can make standard and Dykes type rings. If he doesn't have the ring you need in stock, you send the piston and cylinder and he will make it then. prices are $7.50 up to $9.50. His work is of the finest quality. Frank C Bowman 1211 N Allen Ave Farmington, NM 87401-3568 505-327-0696  (6 pm to 9pm MST weekdays) [email protected]

I am in but will I win??     

Thanks David, I have spoken to Just Engines and their records go back as far as Ripmax, which is to the Gemini II.  Have also spoken to John Haytree who doesn't think the mark 2 con-rod can be fitted to the old crank.  Looking at the OS web site their records cover the FT-120 II Gemini II. Many thanks Dan

 Hi to you all,I have been a fan of rotary & fixed wing modelling for a number of years, this is my first post. I have just finished building a 1/4 scale Sig Cub which has kept my busy through out the winter evenings. I bought a second hand OS 120 FT Gemini for £200, on the authority that it had run for about six hours!  Whilst setting up the engine on the plane it started first time with glow support and sounded awesome, took it down to idle, no problems went to mid throttle and the engine slowed and stopped.  I turned the prop by hand and felt resistance.  On stripping the motor it was found that one of the con-rods had seized on the crankshaft!!  I have found all the equivalent parts for the Gemini II but I don't know if they are compatible? Can any one help? Does anyone still have an old Parts list for the FT-120 Gemini?